High resolution study of the young quadrupole system AO Vel with an eclipsing BpSi primary and HgMn components
- Author(s)
- J.F. Gonzalez, Nicole Nesvacil
- Abstract
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(s)
- Department of Astrophysics
- External organisation(s)
- Complejo Astronómico El Leoncito
- Journal
- Boletin de la Asociacion Argentina de Astronomia
- Volume
- 49
- ISSN
- 1669-9521
- Publication date
- 2006
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/bdbdb330-94c9-473d-ae78-5a294b6d168f