Astron. Astrophys. 349, 521-531 (1999)

How many Bootis stars are binaries? ^*

Rosanna Faraggiana ¹ and Piercarlo Bonifacio <sup>2

1</sup> Dipartimento di Astronomia, Università degli Studi di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
² Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy

Received 15 January 1999 / Accepted 7 June 1999

Abstract

In the attempt to shed new light on the Boo phenomenon we analyzed the astrometric, photometric and spectroscopic characteristics of stars out of a list of recently selected Boo candidates.

We show that the class is still ill-defined and discuss the possibility that some, if not most stars presently classified as Boo, are in fact binary pairs and that peculiar abundances may not correspond to actual values if the average values of the atmospheric parameters and log g are assumed and the effect of veiling is not taken into account.

Key words: stars: atmospheres stars: abundances stars: chemically peculiar

* Partly based on data from the ESA Hipparcos astrometry satellite.

Send offprint requests to: R. Faraggiana

Correspondence to: faraggiana@ts.astro.it

SIMBAD Objects

Contents

• 1. Introduction
• 2. The Boo candidates
• 3. Spectral characteristics
• 4. Kinematics
• 5. Atmospheric parameters
  • 5.1. Colour excess
  • 5.2. and log g
  • 5.3. Colour-magnitude diagram
• 6. Peculiarities of Boo candidates
• 7. Predicted composite spectra
• 8. Discussion
• 9. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: September 2, 1999
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