Issue |
A&A
Volume 376, Number 2, September II 2001
|
|
---|---|---|
Page(s) | 586 - 598 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011020 | |
Published online | 15 September 2001 |
Spectra of binaries classified as λ Bootis stars*
1
Dipartimento di Astronomia dell' Università di Trieste, Via G.B. Tiepolo 11, 34131 Trieste, Italy
2
Institut d'Astrophysique, 98 bis Bld. Arago, 75014 Paris, France e-mail: gerbaldi@iap.fr
3
Université de Paris Sud XI
4
Istituto Nazionale per l'Astrofisica - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34131 Trieste, Italy e-mail: bonifaci@ts.astro.it
5
European Southern Observatory(ESO), Alonso de Cordoba 3107, Vitacura, Casilla 19001, Santiago 19, Chile e-mail: fpatrick@eso.org
6
Observatoire de Paris-Meudon, DASGAL, 5 place Jules Janssen, 92195 Meudon, France e-mail: Patrick.Francois@obspm.fr
Corresponding author: R. Faraggiana, faraggiana@ts.astro.it
Received:
16
January
2001
Accepted:
11
July
2001
High angular resolution observations have shown that some stars classified as λ Boo are binaries with low values of angular separation and magnitude difference of the components; therefore the observed spectrum of these objects is a combination of those two components. These composite spectra have been used to define spectroscopic criteria able to detect other binaries among stars classified as λ Boo. The application of this method to HD 111786 is presented: the contribution of 5 components to the observed spectrum is demonstrated by the shape of the O I 7774 Å feature. This result makes unreliable any attempt to perform an abundance analysis of this object which therefore must be definitely rejected from the class of the peculiar λ Boo stars. This approach allowed us also to recognize that the SB2 star HD 153808 is in reality a triple system.
Key words: stars: abundances / stars: atmospheres / stars: chemically peculiar / stars: binaries: close / stars: binaries: spectroscopic / stars: binaries: visual
© ESO, 2001
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