Beyond the iron group: heavy metals in hot subdwarfs

Details Beyond the iron group: heavy metals in hot subdwarfs Beyond the iron group: heavy metals in hot subdwarfs

2004-07-03

arxiv.org/abs/astro-ph/0407067v1

Astron.Astrophys. 423 (2004) L25-L28

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in A&A Letters

Scientific paper

10.1051/0004-6361:200400027

We report the discovery of strong photospheric resonance lines of Ga III, Ge IV, Sn IV and Pb IV in the UV spectra of more than two dozen sdB and sdOB stars at temperatures ranging from 22000 K to 40000 K. Lines of other heavy elements are also detected, however in these cases more atomic data are needed. Based on these discoveries, we present a hypothesis to explain the apparent lack of silicon in sdB stars hotter than ~32000 K. The existence of triply ionised Ge, Sn, and Pb suggests that rather than silicon sinking deep into the photosphere, it is removed from the star in a fractionated stellar wind. This hypothesis provides a challenge to diffusion models of sdB stars.

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