Volume 376, Number 2, September II 2001
|Page(s)||586 - 598|
|Section||Interstellar and circumstellar matter|
|Published online||15 September 2001|
Spectra of binaries classified as λ Bootis stars*
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: firstname.lastname@example.org
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: email@example.com
5 European Southern Observatory(ESO), Alonso de Cordoba 3107, Vitacura, Casilla 19001, Santiago 19, Chile e-mail: firstname.lastname@example.org
6 Observatoire de Paris-Meudon, DASGAL, 5 place Jules Janssen, 92195 Meudon, France e-mail: Patrick.Francois@obspm.fr
Corresponding author: R. Faraggiana, email@example.com
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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