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

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How many [FORMULA] Bootis stars are binaries? *

Rosanna Faraggiana 1 and Piercarlo Bonifacio 2

1 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


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

We show that the class is still ill-defined and discuss the possibility that some, if not most stars presently classified as [FORMULA] Boo, are in fact binary pairs and that peculiar abundances may not correspond to actual values if the average values of the atmospheric parameters [FORMULA] 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

© European Southern Observatory (ESO) 1999

Online publication: September 2, 1999