The accretion/diffusion theory for λ Bootis stars in the light of spectroscopic data
- Author(s)
- Ulrike Heiter, Werner Wolfgang Weiss, Ernst Paunzen
- Abstract
Most of the current theories suggest the ? Bootis phenomenon to originate from an interaction between the stellar surface and its local environment. In this paper, we compare the abundance pattern of the ? Bootis stars to that of the interstellar medium and find larger deficiencies for Mg, Si, Mn and Zn than in the interstellar medium. A comparison with metal poor post-AGB stars showing evidence for circumstellar material indicates a similar physical process possibly being at work for some of the ? Bootis stars, but not for all of them. Despite the fact that the number of spectroscopically analysed ? Bootis stars has considerably increased in the past, a test of predicted effects with observations shows current abundance and temperature data to be still controversial.
- Organisation(s)
- Department of Astrophysics, Vienna University Computer Center
- External organisation(s)
- Case Western Reserve University
- Journal
- Astronomy & Astrophysics
- Volume
- 381
- Pages
- 971-981
- No. of pages
- 11
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20011594
- Publication date
- 2002
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/6426adf7-bd8d-4cbe-b6ad-058b5d490aaf