Astron. Astrophys. 330, 600-604 (1998)

Effective temperature of detached eclipsing binaries
from Hipparcos parallax ^*

I. Ribas ¹, A. Giménez ², J. Torra ¹, C. Jordi ¹ and E. Oblak <sup>3

1</sup> Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, E-08028 Barcelona, Spain
² LAEFF (INTA-CSIC), Apartado 50727, E-28080 Madrid, Spain
³ Observatoire de Besançon, 41 bis Avenue de l'Observatoire, F-25010 Besançon, Cedex, France

Received 7 August 1997 / Accepted 15 September 1997

Abstract

Effective temperatures of detached eclipsing binaries computed through Hipparcos trigonometric parallaxes are compared with the photometric determinations. The former are based on the values of the radius, the apparent visual magnitude and the bolometric correction of the star, whereas the latter are obtained from standard calibrations using Strömgren or Johnson colour indices.

The working sample contains all well-studied detached double-lined eclipsing binaries belonging to the Hipparcos catalogue and with relative errors in the parallaxes smaller than 20%. They cover a temperature range from 5000 K to 25000 K.

A small systematic trend of 0.010 dex (s.d. 0.010) for 10000 K and of 0.015 dex (s.d. 0.060) for 10000 K is observed between the two temperature determinations, that could be due to inaccuracies on photometric effective temperatures.

Key words: stars: fundamental parameters stars: distances stars: binaries: eclipsing stars: early-type stars: late-type

* Based on data from the ESA Hipparcos astrometry satellite

Send offprint requests to: I. Ribas

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Contents

• 1. Introduction
• 2. The sample
• 3. The procedure
  • 3.1. Errors
  • 3.2. Bolometric correction
• 4. Results
• 5. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998
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