IV INTERNATIONAL Pro-Am MEETING
BINARY & MULTIPLE STARS

Vilanova i la Geltrú (Barcelona, Spain) 18-19-20 SEPTEMBER 2015
ORGANIZATION: Garraf Astronomical Observatory & Campus Universitari de la Mediterrània

 

 

 

Abstracts

We need to have the ABSTRACTS of the presentations before the 30th of May. So we ask you to send them by e-mail (informaciooag@gmail.com) in English and 5-10 lines maximum in a format compatible with the usual programs.

The full text/presentation and the audio-visual support has to be sent before the 30th of August of 2015 by e-mail (informaciooag@gmail.com) so that it can be cheeked and get ready for use. . Two weeks after the Meeting all the communications will be published in the OAG web for posterior consults. Posters: its size has to be communicated in order to have enough surface available.

 

UPDATED TABLE OF SPEAKERS BY ALPHABETIC ORDER

Last updated: 17, september 2015

DOWNLOAD ABSTRACTS BOOK 3.0 (PDF)


NAME

INSTITUTION / GROUP

COUNTRY

TITTLE

EKATERINA AVVAKUMOVA
URAL STATE UNIVERSITY
RUS

CATALOGUE OF ECLIPSING VARIABLES CEV

Abstract

A new version of the Catalogue of Eclipsing Variables will be presented. The catalogue contains parameters and morphological types of light curves for some 7200 stars. Spectral classification and recently published information about evolutionary type of about 1300 systems are also given. Our catalogue represents the largest list of eclipsing binaries classified from observations.  In the talk we will discuss several problems with the data and some interesting eclipsing binaries, which were found during our work.

INVESTIGATION OF SEVERAL ECLIPSING BINARIES 

Abstract

During the work on Catalogue of Eclipsing Variables we compiled an extensive list of binaries with lack of observable parameters or doubtful evolutionary type. In the talk we will present first results of our observational campaign on several northern stars and their investigations.

JAVIER ALONSO
UNIVERSIDAD DE ALICANTE
SPA

BINARITY IN MASSIVE STARS: LS III +46 11"

Abstract

Massive stars (stars with masses, at least, larger than 8 times that of our Sun) end their lives in luminous explosions as core-collapse supernovae or gamma-ray bursts. Most of this massive stars are born in multiple systems and a large fraction of them are quite close binaries, so we only can detect the companions by studying its spectra. Recently, in this way, we have discovered one of the most massive binary known to date: LS III +46 11"

RAINER ANTON
AMATEUR
GER

ON THE ACCURACY OF DOUBLE STARS MEASUREMENTS FROM LUCKY IMAGING

Abstract

The precision and accuracy of measuring double stars from telescopic images is addressed, in particular for “lucky imaging”. Three major contributions to the total error margins are dicussed in some detail: the resolving power of the telescope and camera, variations of the seeing, and the image scale. Representative results are compared with literature data.

BOB ARGYLE

INSTITUTE OF ASTRONOMY UNIVERSITY OF CAMBRIDGE

UK

THE LIFE HISTORY OF A DOUBLE-STAR TELESCOPE

Abstract

W. R. Dawes ordered an 8-inch (20-cm) refractor from Thomas Cooke and Sons which began operation in 1864. More than 150 years later it is still in operation. I describe the history and the travels of the telescope, ending with its current location in Cambridge where a programme of measurement has been in progress for 25 years.

KARL LUDWIG BATH

INTERNATIONALE AMATEUR STERNWARTE

GER

THE SPECKLE MASKING METHOD -- RECONSTRUCTION OF NARROW BINARY STARS

Abstract

To get the theoretical telescope resolution there are two methods today. The most modern one is the adaptive optics though unaccessible for us amateurs. The older method reconstructs the Airy disk by reducing the data in the PC. Speckle interferometry can and should be used by us. The first step is the autocorrelation providing already the distance and position angle of a binary star. The refined speckle masking method allows to reconstruct the binary and possibly also its photometry.

RAFAEL BENAVIDES & EDGARDO R.MASA

OED

ASOCIACIÓN ASTRONÓMICA DE CÓRDOBA

SOCIEDAD ASTRONÓMICA SYRMA DE VALLADOLID

SPA

THE "OBSERVADOR DE ESTRELLAS DOBLES" MAGAZINE: A PRO-AM EXPERIENCE

Abstract

El Observador de Estrellas Dobles (OED) is a Spanish language electronic double-star ournal published twice a year. OED was born in 2009 and during this time has become a reputed magazine distinguished by a marked Pro-Am character. In our communication we will make a statistical overview of the results obtained in these six years: almost 6000 measures of double stars and more than 700 new pairs have been added to the WDS. Likewise, the editorial team his gratefulness to all collaborators, real protagonists of these contributions; we are a mere link for the Pro-Am relationship.

DANIEL BONNEAU

ASTRONOME HONORAIRE DE L'OCA

FRA

95 YEARS OF INTERFEROMETRIC OBSERVATIONS OF DOUBLE STARS

Abstract

During the twentieth century, the double stars have become prime targets for astronomical observations using optical interferometry techniques. The use of interference micrometers, the invention of speckle interferometry and the development of stellar interferometers according to principles of Fizeau and Michelson, finally eliminate the boundaries between visual binaries, spectroscopic binaries and photometric binaries. At the beginning of the twenty-first century, a new milestone has been reached with obtaining images revealing the morphology of close binaries by means of the first optical telescopes networks working in aperture synthesis.

 

JOSÉ A. CABALLERO

CENTRO DE ASTROBIOLOGIA CSIC-INTA

SPA

BINARY SYSTEMS: FROM 0.2 ARCSEC TO 2 DEG (FIVE YEARS LATER)

Abstract

Five years ago, during the II International Meeting of Double Stars Observers in Sabadell, I gave a talk with a very similar title to this one. It contained astrometric binaries with up to 40 solar masses in young open clusters, pairs of ultracool dwarfs separated by thousands astronomical units in the solar neigbourhood or the most fragile multiple stellar systems at the point of disruption by the Galactic gravitational field. In 2015, I will give another comprehensive and illustrative talk with the latest examples of extreme or benchmark multiple systems at all angular (and physical) separation, masses and ages.

JOSEP M. CARRASCO

 

 

INSTITUT DE CIÈNCIES DEL COSMOS (ICCUB)

UNIVERSITAT DE BARCELONA  

 

 

 

MULTIPLE SYSTEMS WITH GAIA MISSION

Abstract

Gaia ESA mission (launched in 2013) will obtain positions, parallaxes, proper motions, radial velocities and astrophysical parameters for about one billion objects. Amongst these sources will be numerous multiple systems. The high level of precission of Gaia observations will allow to detect a high number of previously unresolved binaries, trace their orbits in space and improve our knowledge about the ratio of binary stars in our Milky Way. Gaia will also build precise photometric lightcurves during 5 years allowing to discover and study many eclipsing binary systems determining their periods and main characteristics.

 

JOSE LUIS COMELLAS
UNIVERSIDAD DE SEVILLA
SPA

LETTER TO IV INTERNATIONAL MEETING

Dear Tòfol
Is for me a very big cause of joy that you could celebrate the 4th meeting in Vilanova with so extraordinary attendance of specialists from all over the world.My most warm-hearted congratulations. I don’t know ehat type of work could I sent at this stage of life, with 87 years, and without possibilities of observation. For me was a delight to dedicate to the double stars with very modest instruments, and enjoy the beauty of so thousands of pairs throughout 60 years.Mine was a prehistoric labour, but I’m happy to see that elemental joy has been shared by so many amateurs, among who you have standed out already among the firsts.

I wish this days to be a success, and you know that by heart I’m among you. I hope to see some news.

Greetings to all of you and for you a warm-hearted hug.
José Luis Comellas.

MIRIAM CORTÉS

UNIVERSIDAD COMPLUTENSE DE MADRID

SPA

MULTIPLICITY OF M DWARFS IN THE CARMENES EXOPLANET SURVEY SAMPLE

Abstract

With the help of CARMENCITA, the CARMENES Cool dwarf Information and datA Archive, we investigate the multiplicity of M dwarfs in the solar neighnourhood observable from Calar Alto to prepare and characterize the final sample of stars of CARMENES. Our multiplicity study overs a wide range in projected physical separations, from 0.5 to 50000 AU. The inner range is overed with a lucky-imaging survey of 385 M dwarfs with FastCam at the 1.5 m Telescopio Carlos Sánchez (42.3 mas/pix), complemented with a literature search. The outer range is covered with a detailed analysis of Washington Double Stars catalogue data and optical images taken by us with TCP and CAMELOT at the 0.8 m IAC80 telescope, and an astrometric study of all-sky public images and catalogues. We review the main results of our searches and derive the multiplicity of M dwarfs at close and wide physical separations.

ROSA Mª DOMÍNGUEZ
  INSTITUTO DE FÍSICA DE CANTABRIA

OBSERVATORIO ASTRONÓMICO DE CANTABRIA

SPA

SEARCHING p-MODES IN BINARY STARS

Abstract (Poster)

We are looking for stellar oscillations in several binary star systems. Most of them have been obtained by CoRoT satellite during the last years. CoRoT mission had two objectives: to search for extrasolar planets with short orbital periods, particularly those of large terrestrial size, and to perform asteroseismology by measuring solar-like oscillations in stars. During the first six years of its mission, CoRoT has observed about 150 bright stars in the sismo-field and more than 150 000 stars in the exo-field. We have analyzed 62 binaries sistems among the exo-field. We show here the results obtained for 12 of these systems. In order to evaluate how difficult is to detect oscillation with terrestrial observation, we also observed some systems with several telescopes. Here we present results for X Tri binary system, that was observed in IAC80 and MERCATOR telescopes.

JAKUB JURYSEK

INSTITUTE OF PHYSICS OF THE CZECH ACADEMY OS SCIENCES

CHARLES UNIVERSITY

CZE

THE FRAM TELESCOPE AND PHOTOMETRY OF ECLIPSING BINARIES

Abstract

The FRAM (F/(Ph)otometric Robotic Atmospheric Monitor) telescope is a part of the Pierre Auger Observatory (PAO) located near town Malargüe in Argentina. The main task of the FRAM telescope is the continuous night-time monitoring of the atmospheric extinction and its wavelength dependence. The current methodology of the measurement of a atmospheric extinction allows simultaneous observation of other interesting astronomical targets. The current observations of the FRAM telescope are focused mainly on the photometry of eclipsing binaries. In this presentation, we briefly introduce current astronomical observing program including photometry of some triple systems with distant visual companion and preliminary results of the follow up observations of some inclination changing candidates.

JOSEFINA F. LING
UNIVERSIDADE DE SANTIAGO DE COMPOSTELA
SPA

BINARY STARS IN THE IAU: PAST AND NEW COMMISSIONS

Abstract

We analyze the role tah binary star have played in the International Astronomical Union (IAU) through ist two most representative Comissions, Commission 26 "Double and Multiple Stars" and Commission 42 "Close Binary Stars". Next we will justify the reasons for why both commissions have merged into Commission G.C1 (i.e., Commission 1 of Division G) called "Binary and Multiple Stars Systems" --at the XXIX IAU General Assembly, held in Hawai in August 2015-- as well as their future projects planned.

 

FLORENT LOSSE

COMMISSION ETOILES DOUBLES SAF

FRA

REDUC TOOL

Abstract (Poster)

Reduc is a software commonly used by double stars enthusiasts. It provides easy to use tools for reductions. The poster presented at the IVth International Pro-Am Meeting on Binary and Multiple Stars focuses on the main features and on the latest evolutions of the version 5 (Vilanova version!). They include Easy Lucky Imaging and Batch modes features.

RUSSELL M. GENET

CALIFORNIA POLYTECHNIC STATE UNIVERSITY

USA

SPECKLE INTERFEROMETRY OF CLOSE BINARY STARS

Abstract

A group of professional, amateur, and student astronomers, primarily in the Western United States and Hawaii, has been making speckle interferometric observations of close binary stars. While many of our observations have been on smaller telescopes, 0.1- to 0.5-meters, we have had two week-long runs on a 2.1-meter telescope at Kitt Peak National Observatory. We have developed user-friendly reduction software that incorporates the use of single deconvolution stars, adjustable filters, automatic preprocessing of the data, and semiautomatic operation. High school and undergraduate students in our Astronomy Research Seminars have been reducing and analyzing our speckle interferometry observations. We have several ongoing exploratory developmental programs. These include the development of shaped aperture masks to diffract the bright light of the primary star off in preferred directions to provide discovery zones for faint secondary stars, adding intensifiers to low cost CCD and CMOS cameras as an affordable alternative to EMCCD cameras, and automation of speckle interferometry. Still highly experimental are initial laboratory tests a very low-cost system for positioning mirrors to a fraction of a wavelength for a sparse-aperture speckle interferometry telescope. Our initial laboratory setup is for three 0.25-meter spherical mirrors with focal lengths matched to within a millimeter. Very low cost 2- or 4-meter telescopes are not out of the question.

 

RAFAEL HERNÁNDEZ

UNIVERSIDAD POLITÉCNICA DE MADRID, AAM

SPA

THE METHOD OF VIDAL-ABASCAL / KINKERFLUES FOR DETERMINING THE ORBIT OF A BINARY SYSTEM FROM SHORT ARCS

Abstract

Generally speaking, this presentation deals with methods of orbit computation of binary stars based mainly on measurements of position angles. Avoiding as much as possible the use of separation data presents advantages, reducing errors and allowing the computation of longer period pairs. We will review the method due to Ernst F. W. Klinkerfues and a variation proposed by Enrique Vidal Abascal. The method of Klinkerfues is based on some geometrical notions that theoretically allow the computation of an orbit from observational data coming from short arcs. Thus, it can be applied to longer period systems or systems observed during a relatively short time. The variation introduced by Vidal Abascal presents some advantages over the original. Firstly some computational improvements, perhaps no longer significant in the era of electronic computation. Secondly and more importantly, certain insensitiveness of the computation with respect to errors or uncertainties in the values of orbital elements such as the orbital inclination, the semiaxis major, the position angle of the ascending node and the argument of periastron. We will finally show progress on the elaboration of a software application for using these methods easily.

 

HUIB HENRICHS

MARCELLA WIJNGAARDEN

 

ANTON PANNEKOEK INSTITUTE FOR ASTRONOMY

(UNIVERSITY OF AMSTERDAM)

NETH

WHY WAS THE RECENT ECLIPSE OF THE VISUAL BINARY ALPHA COM (P=26y) MISSED ?

Abstract

The orbital inclination of the visual (F5V + F6V) binary Alpha Comae (P ~ 26 y) is very near 90 degrees, which gives a high probability of an eclipse. Observations exist since 1827, but no eclipse has ever been observed. The last possible eclipse was predicted to occur within two weeks around January 25, 2015 (Muterspaugh & Henry (2014), referred to as MH14). We reinvestigated the predicted eclipse date in December 2014. For the special case of a 90 degrees inclined orbit the Thiele-Innes method can be reduced to a straight forward approach to determine five of the seven common orbital elements (Omega and i not being relevant), which enables a prediction of the epoch of the nearest eclipse. Using the same dataset with the same weights as used by MH14, we found significantly different values for a, omega, e, P, and T0, resulting in a predicted eclipse date about 2 months earlier than in MH14, and with a 1 sigma uncertainty of 2 weeks. Using the full dataset, we conclude that the eclipse had unfortunately already passed before the predicted day. The origin of the discordance between our and MH14s' prediction was analyzed and attributed to a few erroneous datapoints  in MH14, to which our method is not sensitive. The first next opportunity has to wait until 2040.

GREGORY JONES

ALT-AZ INITIATIVE

USA

CHARACTERIZION OF NON-EMCCD CAMERAS AND OPTIMIZING PROCESSES FOR SPECKLE AND LUCKY IMAGING OF DOUBLE STARS”

Abstract

While EMCCDs have become the preferred camera for both speckle interferometry and lucky imaging, their high cost makes them impractical for many small institutions and amateurs.  The advent of modern industrial and planetary cameras brings viable alternatives to for those wishing to participate on restrictive budgets.A number of inexpensive cameras have been tested and the results presented.  Additional information and discussion is presented on optimization strategies to allow performance to be extended situationally. 

 

OLGA KIYAEVA

ET AL.

 

PULKOVO ASTRONOMICAL OBSERVATORY

RUS

DYNAMICAL AND ASTROMETRICAL INVESTIGATIONS OF BINARY STARS WITH AUTOMATED 26-INCH REFRACTOR IN PULKOVO. RECENT RESULTS

Abstract

The 26-inch refractor of Pulkovo observatory is automated and observes without observer. Now there are about 18000 CCD and 13000 photographic observations of wide double and multiple stars. To digitize the photographic plates the new device MDD is applied. The AMP method is used for determination of the orbits of slowly moving stars (300<P<10000yr) on the basis of short arc of uniform observations. High precision of relative positions, motions and relative radial velocities is the main condition of these investigations. 

 

OLGA KIYAEVA

ET AL.

PULKOVO ASTRONOMICAL OBSERVATORY,

ST.PETERSBURGS STATE UNIVERSITY,

KAZAN FEDERAL UNIVERSITY

 

RUS

MULTIPLE STARS INVESTIGATION

Abstract (Poster)

Dynamical status of 13 visual triple systems with common proper motions of components was investigated. The probabilities of gravitational bounding of the systems and binary subsystems were estimated. We have considered the motions in the plane of sky, using the same values of parallaxes for all components of the system and zero relative radial velocities. So we have found maximal values of energy relation κ = |U/T| (potential to kinetic one). If κ ≥ 1 then the radial velocities have to be taken into account.

 

 

JOAN GENEBRIERA-

TACANDE-LA PALMA
OBSERVATORY

 

SPA

DOUBLE STAR SPECTROSCOPY, AN AMATEUR ADVENTURE

Abstract

Investigation of the use of a spectrograph for detection and measure of closed binary systems was conducting using low cost materials. A low resolution optical spectra R=5000, was taken with a 0.4m-class telescope of  Mu-1 Scorpius and Sigma-Aquila, collected along several nights from Tacande Observatory.  The observed spectra show signs of the double star nature. To ensure the stability and repeatability of the spectrometric measurements, the spectrograph calibration system has to be enhanced and/or redesigned.

OLEG MALKOV

INSTITUTE OF ASTRONOMY OF THE RUS. ACAD. SCI.

RUS

BINARY STAR DATABASE BDB

Abstract

The fully operational version of the world's principal database of binary and multiple systems of all observational types, BDB, is presented. The Binary star DataBase is available at http://bdb.inasan.ru and is created as a source joining the comprehensive information on binary stars of all observational and evolutionary types. It provides the user with synthesis of data of large variety of catalogues and databases of binaries of different types: visual, orbital, astrometric, eclipsing, spectroscopic, photometric, etc. The BDB contains all data from catalogues on about 50,000 stellar systems of multiplicity 2 to 22: positional, photometric, spectroscopic, orbital and astrophysical parameters are provided when available. Organization of the information is based on the careful cross-identification of the objects. This allows the user, in particular, to search data on binaries having certain sets of parameters within the complete catalogued data set.

VISUAL AND ORBITAL BINARIES: PRINCIPAL CATALOGUES,
SELECTION EFFECTS AND PARAMETER DISTRIBUTIONS

Abstract

The most complete list of visual binary systems with known orbital elements is compiled. It is based on OARMAC and ORB6 data and contains 3139 orbits for 2278 pairs. A refined subset of high quality orbits with available distance was also compiled. Relations between and distributions along different observational parameters are constructed, and an analysis of selection effects is made. Dynamical, photometric and spectral masses of systems are estimated, and reasons for discrepancies between them are discussed.

BRIAN MASON & WILLIAM I. HARTKOPF

USNO
USA
LETTER TO IV INTERNATIONAL MEETING

DAVID MONTES

UNIVERSIDAD COMPLUTENSE DE MADRID

SPA

CALIBRATING THE METALLICITY OF M-DWARFS WITH WIDE VISUAL BINARIES

Abstract

In this contribution we summarise our ongoing project aimed at calibrating the metallicity of M-dwarfs. We have selected a large sample of physical binaries composed of an F-, G- or K-dwarf primary and an M-dwarf secondary. High-resolution spectra of the primary components are being analysed in order to determine, in an uniform way, accurate atmospheric parameters, metallicity and abundance of different elements. Low-resolution spectra of the secondary components allow us to determine good spectral types and metallicity-dependent spectral indices. Using all this information we are improving the current spectroscopic and photometric calibrations of the M-dwarf metallicity and we are testing some new ones. The resulting calibrations will be very useful in the characterisation of the input sample of exoplanets search programs around M-dwarfs like CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Échelle Spectrographs).

NATALIA SHAKHT

ET AL.

PULKOVO OBSERVATORY
RUS

THE POSSIBLE HOST STARS OF EXOPLANETS ON THE PULKOVO
OBSERVATIONS PROGRAMME.

Abstract (Poster)

The Pulkovo programme for many years was dedicated the observations and study of the single and binary stars close to the Sun to determine the parameters of their movement, the orbits of binary stars, masses and to search invisible components. The most part of them are the stars of spectral classes F, G,K,M, and they could be parent stars for exoplanetary systems. We estimated the possible astrometric signals from planets with different masses which could be available with more high technics in the future. Also for some stars we estimated the limits of possible habitable zones (HZ) with the using the new data about stars and with the models by Kasting 1993, Selsis et al.,2007 and Rushby et al., 2013 for HZ.

CARLES SCHNABEL

AGRUPACIÓ ASTRONÓMICA DE SABADELL (AAS)

SPA

OCCULTATIONS AS A TOOL TO DETECT BINARY SYSTEMS

Abstract

Lunar and asteroidal occultations permit the discovery, confirmation or characterization of double or multiple star systems. The Occult application developed by Dave Herald, allow the computation of occultations of stars catalogued as doubles, and the Occult Watcher application created by Hristo Pavlov, the coordination of observation campaigns. However, there are also many cases in which occultations lead to double stars discoveries within distances in the range of hundredths of an arc-second. The same Occult, on the one hand, and Tangra from Hristo Pavlov, enable the analysis of recordings and determining the position parameters of a double system. I will show some examples about these topics.

J.A.SOLDEVILLA

JOAN GENEBRIERA

 

OBSERVATORI DE CANYELLES

TACANDE-LA PALMA OBSERVATORY

&

UNIVERSITAT DE VALÈNCIA

SPA

RUSSIAN MADE OPTICS OF A 200mm F/15 REFRACTOR REBORN IN ALT-AZ GoTo TELESCOPE WITH 90º VISION. FROM 3m TO 1,20m TUBE DESING

Abstract (Poster)

This joint project of OAG + Universitat de València aims assembly an achromatic doublet of 200mm diameter and F/15 focal lens, built in Russia. With a length of 3 meters tube it is almost impossible to install in a observatory of small dimensions. J.A.Soldevilla and Joan Genebriera designed an option that reduces the tube to 1.20 meters. The telescope will set up a CCD and Double Image Camichel-Lyot micrometer, for visual double stars programs.

SEE + INFO ON THIS PROJECT IN OAG WEB SITE PAGE

 


EDGARD SOULIÉ &
PIERRE DURAND

 

COMMISSION ETOILES DOUBLES SAF
FRA

THREE PROMINENT CONTEMPORARY DOUBLE STAR OBSERVERS: PAUL COUTEAU (1923-2014) & JEAN DOMMANGET (1924-2014) & GUY SOULIÉ (- 2015)

Abstract

Paul Couteu: Né le 31 décembre 1923, passionné par l’astronomie à l’adolescence, Paul Couteau fait de solides études littéraires jusqu’au baccalauréat puis des études cientifiques. Il prépare sa thèse de doctorat sur les naines blanches  sous la direction d’Evry Schatzman. En 1951, il devient assistant à l’Observatoire de Nice et Robert Jonckheere lui donne une formation pratique d’observateur d’étoiles doubles (ED) visuelles ; dès lors, il accumule les mesures. En 1961, il passe six mois à l’Observatoire Yerkes avec George Van Biesbroeck. De 1963 à 1969, Paul Couteau dirige la rénovation de la grande lunette de Nice. Il préside la Commission des ED de l’UAI et en 1969, il organise un colloque international sur les ED. Ayant entrepris une prospection du ciel, il accumule les découvertes d’ED. Il est le huitième observateur de l’histoire par le nombre de ses mesures et par celui de ses découvertes. Lauréat du prix Janssen de la SAF, ce savant est aussi un enseignant et un écrivain, qui a publié cinq livres. Son livre intitulé « L’observation des étoiles doubles visuelles » (1978) a stimulé l’intérêt des astronomes amateurs pour les ED.  Son livre « Ces astronomes fous du ciel ou l’histoire de l’observation des étoiles doubles » (1988), sans équivalent, est traduit en espagnol. Il décède le 28 août 2014. La Commission des Etoiles Doubles de la S.A.F. perd en lui un conseiller scientifique toujours disponible.

Jean Dommanget: naît le 13 Juin 1924, à Bruxelles (Ixelles). En 1947, il travaille à l'Observatoire Royal de Belgique comme aide temporaire dans la section des étoiles doubles dirigée par le Dr Sylvain Arend. En parallèle,  il  poursuit ses études ; en 1950, il obtient un diplôme universitaire en sciences mathématiques (1950). En 1961,  il obtient un doctorat  ès sciences et devient membre de la Commission 26 "étoiles doubles" de l’Union Astronomique Internationale (UAI). Il  travaille dans divers domaines : l'astrométrie et la dynamique des étoiles doubles visuelles, les occultations stellaires et le profil lunaire, la turbulence atmosphérique, les astéroïdes, les éclipses solaires et lunaires, les outils mathématiques, les propriétés orbitales et l'évolution  des étoiles binaires. En 1955-1957, il effectue une mission de prospection en Afrique du Sud à la recherche d’un site approprié à la construction d'un observatoire européen dans l’hémisphère australe (ESO). Plus tard, il est directeur par intérim  de l'Observatoire de Boyden à Bloemfontein. De 1967 à 1973, il est vice-président puis  président de la Commission 26 de l’UAI. En 1981, il rejoint le consortium du catalogue d’entrée (INCA) de la mission astrométrique Hipparcos de l'Agence spatiale européenne et dirige le sous-groupe "Etoiles Doubles" du Comité exécutif. Auteur de nombreuses publications, il devient chef du Département d'astrométrie et de mécanique céleste. Il participe au comité qui pilote la sélection des étoiles du programme Hipparcos. En 1993, il  rejoint le groupe de travail Etoiles Doubles. En 1994, avec l'aide  de  M. Omer Nys, il publie un "Catalogue des Composantes d'Etoiles Doubles et Multiples" (CCDM), adapté aux besoins du catalogue d'entrée d’Hipparcos (HIC). Il contribue à la publication en 1997 du catalogue Hipparcos, Annexe 1 – Etoiles doubles et multiples (ESA, vol. 6). Membre de la Société Astronomique de France depuis 1954, il devient conseiller scientifique de la Commission des Etoiles doubles au milieu des années 1980 et fait participer la Commission à la vérification des positions des couples HIP pour l’INCA. Il décède le 1er Octobre 2014.




GIANLUCA SORDIGLIONI

 

 

AMATEUR

 

 

ITA

STELLE DOPPIE: DOUBLE STAR DATABASE SEARCH ENGINE TO THE WDS

Abstract

Abstract: Finding information on double stars may be very difficut for amateur astronomers. The WDS assign a catalog number for the doubles and cross-references with existing catalogs is a time-consuming operation. StelleDoppie addresses all those problems, providing a clear interface to present information and a power tool to find doubles. Tips and tricks to improve users' searching skills will be presented.






TÒFOL TOBAL


XAVIER MIRET

IGNACIO NOVALBOS






OBSERVATORI ASTRONÒMIC DEL GARRAF

 

 

 

 

SPA

OAG WIDE PAIRS SURVEY PROJECT (2008-2015) & GWP CATALOGUE OF 3000+ SYSTEMS

Abstract

OAG Common Proper Motion Wide Pairs Survey (CPMWPS) is a Pro-Am project developed and coordinated by Garraf Astronomical Observatory and professional team (D.Valls, J.A.Caballero, E.Solano et al.) since 2008 to 2015 with the aim of finding new anonymous common proper motions stars pairs which can form physical systems but which are not yet catalogued. Making use of the Virtual Observatory Tools we have completed a systematic exploration of the Equatorial Zone ( from  RA 00h 00m 00s to 23h 59m 59s  between Dec +20º 00’ 00” and -20º 00' 00'' ) taking as a fundamental parameter a common proper motion higher than 50 marcsec/year, without  limiting magnitude. We present a catalogue with more that  3000 new pairs detected as well as their influence in a new professional projects.

DAVID VALLS

CNRS / OPM

FRA

THE ROLE OF BINARY STARS IN THE PLEIADES

Abstract

Abstract. We review the latest results on the open star cluster M45. New massive surveys have  provided us with unprecedented details on proper motions, and new measures of the dynamical mass of the cluster. The evolution of the cluster is also jointly constrained from the colour-magnitude  diagram of its members, where unresolved binary systems can be taken into account. We also discuss the problem of its distance, and the results of a pro-am programme aimed at understanding a unique binary system. 

     
JEAN LUOIS AGATI
COMMISSION ETOILES DOUBLES SAF
FRA

MOHAMMED A. AHAD

AMATEUR

UK

 

ANTONIO BERNAL
OBSERVATORI FABRA
SPA

Astronomer guide for the visit to Observatori Fabra (Barcelona), sunday 20 / puntovernal@telefonica.net

GRADY BOYCE
ARMY & NAVY ACADEMY IN CARLSBAD (CA)
USA
 
RAFAEL CABALLERO
ASOCIACIÓN ASTRONÓMICA HUBBLE
SPA

ROBERTO Mª CALOI

UNIONE ASTROFILI BIELLESI

ITA

 

NÚRIA JORDANA
UNIVERSITAT DE BARCELONA
SPA
 
CARLOS LASGOITY
LIADA / GEDRAA
ARG
GIANPIERO LOCATELLI
AMATEUR
ITA
ANDREA MANTERO
BERNEZZO OBSERVATORY
ITA
ENRIQUE DE FERRA MARTÍN
ACADEMIA DE CIENCIAS E INGENIERÍAS DE LANZAROTE
SPA
GUILLEM MARTÍ
UNIVERSITAT DE BARCELONA
SPA

LLUIS RIBÉ

AGRUPACIÓ ASTRONÓMICA DE SABADELL

SPA

 

RAMON SANROMÀ
OBSERVATORI ASTRONÒMIC DEL GARRAF
SPA
COORDINATOR OF IV MEETING PROGRAME & TRANSLATIONS
     

contact us for any question (erroneus tittle name, institution code, etc)
informaciooag@gmail.com

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