SIMBAD references

2004A&A...423L..25O - Astronomy and Astrophysics, volume 423, L25-28 (2004/8-4)

Beyond the iron group: Heavy metals in hot subdwarfs.


Abstract (from CDS):

We report the discovery of strong photospheric resonance lines of Gaiii, Geiv, Sniv and Pbiv in the UV spectra of more than two dozen sdB and sdOB stars at temperatures ranging from 22000K to 40000K. 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 ∼32000K. 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.

Abstract Copyright:

Journal keyword(s): stars: subdwarfs - stars: abundances

Simbad objects: 30

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