Journal Article

AO Vel: the role of multiplicity in the development of chemical peculiarities in late B-type stars*

J. F. González, S. Hubrig and F. Castelli

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 4, pages 2539-2547
Published in print March 2010 | ISSN: 0035-8711
Published online March 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16061.x
AO Vel: the role of multiplicity in the development of chemical peculiarities in late B-type stars*

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We present high-resolution, high signal-to-noise UVES spectra of AO Vel, a quadruple system containing an eclipsing BpSi star. From these observations, we reconstruct the spectra of the individual components and perform an abundance analysis of all four stellar members. We found that all components are chemically peculiar with different abundance patterns. In particular, the two less massive stars show typical characteristics of HgMn stars. The two most massive stars in the system show variable line profiles indicating the presence of chemical spots. Given the youth of the system and the notable chemical peculiarities of their components, this system could give important insights in the origin of chemical anomalies.

Keywords: binaries: eclipsing; binaries: spectroscopic; stars: chemically peculiar; stars: individual: HD 68826

Journal Article.  5248 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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