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Analysis of the Hipparcos Sample of Eclipsing Binaries Parallaxes And Multiplicity

Published online by Cambridge University Press:  14 August 2015

E. Oblak ,
M. Kurpinska-Winiarska ,
T. Kundera ,
S. Zola  and
T.Z. Dworak
E. Oblak
Affiliation:
1 Observatoire de Besançon, 25010 Besançon Cedex, France
M. Kurpinska-Winiarska
Affiliation:
2 Cracow Observatorium, Cracow, Poland
T. Kundera
Affiliation:
2 Cracow Observatorium, Cracow, Poland
S. Zola
Affiliation:
2 Cracow Observatorium, Cracow, Poland
T.Z. Dworak
Affiliation:
3 Academy of Mining and Metallurgy, Cracow, Poland

Extract

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The Hipparcos astrometric satellite observed 993 known eclipsing binaries. Prom 1048 eclipsing binaries of the Brancewicz and Dworak ’s catalogue (1980), there are only 368 observed by Hipparcos, as the others are too faint.

On the basis of these common stars, we have undertaken the comparison ofthe satellite parallaxes with the photometric ones. We obtain a good agreement between the two systems with a mean dispersion of 5 mas. The greatest dispersion is for the goup of eclipsing binaries of the EW type. The eclipsing binaries of this group have a mass-luminosity relation different from those of the main sequence stars.

An inadequate knowledge of the component spectra of an eclipsing binary seems to be one of the most important cause of discrepancies. For some brightest stars, the new Hipparcos trigonometric parallaxes differ very significantly from those previously known from ground based measurements. It seems that the presence of a close visual components causes statistically an underestimation of photometric or overestimation of Hipparcos parallaxes.

172 Hipparcos eclipsing binaries have a close visual component, generally less than 10 arcseconds apart. The list of these stars for various stellar groups and a brief analysis are presented.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 569
Copyright
Copyright © Kluwer 1998

References

Brancewicz, H.K., Dworak, T.Z. (1980), ‘A Catalogue of Parameters for Eclipsing Binaries’, Acta Astron., 30, N° 4.Google Scholar