Radiative Levitation in Hot Horizontal Branch Stars

Details Radiative Levitation in Hot Horizontal Branch Stars Radiative Levitation in Hot Horizontal Branch Stars

1999-06-08

arxiv.org/abs/astro-ph/9906123v1

Astronomy and Astrophysics

Astrophysics

4 pages, contributed talk at the meeting "Spectrophotometric Dating of Stars and Galaxies", Annapolis, USA, May 1999

Scientific paper

There is now considerable evidence that horizontal branch (HB) stars hotter than about 11,500 K experience an enormous enhancement of their photospheric iron abundance due to radiative levitation. In globular clusters, the photospheric iron abundance can reach values of [Fe/H] ~ +0.3, or up to two orders of magnitude higher than the cluster iron abundance. Model atmospheres which take into account the iron overabundance are needed for understanding the appearance of the HB in globular cluster color-magnitude diagrams (CMDs), for the derivation of accurate luminosities, gravities and masses, and for the ultraviolet spectral synthesis of old, metal-poor stellar populations.

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