Abundance studies of sdB stars using UV echelle HST/STIS spectroscopy

Details Abundance studies of sdB stars using UV echelle HST/STIS spectroscopy Abundance studies of sdB stars using UV echelle HST/STIS spectroscopy

2006-03-02

arxiv.org/abs/astro-ph/0603069v1

Astronomy and Astrophysics

Astrophysics

14 pages, 12 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20053948

Aims: We test the hypothesis that the pulsations in sdB stars are correlated with the surface abundances of iron-group elements. Any correlation might explain why, when given two spectroscopically similar stars, one will pulsate while the other will not. Methods: We have obtained high-resolution ultraviolet spectra two pulsating and three non-pulsating sdB stars using the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. We determined abundances for 25 elements including the iron group and even heavier elements such as tin and lead using LTE curve-of-growth and spectrum synthesis techniques. Results: We find no clear correlation between pulsations and metal abundances, and we comment on the resulting implications, including whether it is possible to determine the difference between a pulsating and a non-pulsating sdB spectroscopically. In addition to the main goal of our observations, we have also investigated the effect of supersolar metallicity on fundamental parameter determination, possible trends with iron abundance, and the hypothesis that weak winds may be selectively removing elements from the stellar envelopes. These effects provide challenges to stellar atmosphere modelling and diffusion models for sdB stars.

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