The accretion/diffusion theory for λ Bootis stars in the light of spectroscopic data

Autor(en)

Ulrike Heiter, Werner Wolfgang Weiss, Ernst Paunzen

Abstrakt

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(en)

Institut für Astrophysik, Zentraler Informatikdienst

Externe Organisation(en)

Universität Wien, Case Western Reserve University

Journal

Astronomy & Astrophysics

Band

381

Seiten

971-981

Anzahl der Seiten

11

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361:20011594

Publikationsdatum

2002

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6426adf7-bd8d-4cbe-b6ad-058b5d490aaf