High resolution study of the young quadrupole system AO Vel with an eclipsing BpSi primary and HgMn components

Autor(en)

J.F. Gonzalez, Nicole Nesvacil

Abstrakt

We present a study of chemical abundances of all four stellar components of AO Vel, a multiple system recently reported as a spectroscopic quadruple system with components very close to the ZAMS (Gonzalez et al. 2006, A&A 449, 327). The temperature obtained for components A, B, C, and D are 13700, 12200, 12000, and 11500 K, respectively. Star A exhibits an overabundance of Si by 1.0 dex and an underabundance of He by -0.5 dex. Star B is a normal late B-type star with abundances close to solar. Stars C and D present spectral lines typical for HgMn stars, although very few Mn II lines have been identified. Star C shows a strong overabundance of Hg by 6.7 dex, while other metals (Fe, Ti, Mg and Si) show solar abundances. Star D exhibits, besides Hg, overabundance of Y II (3.1 dex), Pt I (5 dex), and Sr II (2.2 dex). The measured wavelength of Hg II 3984 indicates that the heavy Hg isotopes 202 and 204 are predominant in components C and D. A more detailed study, including spectral synthesis is planned to provide limits on the Mn abundance.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Complejo Astronómico El Leoncito

Journal

Boletin de la Asociacion Argentina de Astronomia

Band

49

ISSN

1669-9521

Publikationsdatum

2006

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/bdbdb330-94c9-473d-ae78-5a294b6d168f