Influence of α-enhancement on effective temperatures of hot subdwarfs

Details Influence of α-enhancement on effective temperatures of hot subdwarfs Influence of α-enhancement on effective temperatures of hot subdwarfs

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329...15g&link_type=abstract

Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 15-18

Astronomy and Astrophysics

Astrophysics

1

Stars: Abundances, Stars: Subdwarfs, Stars: Horizontal-Branch

Scientific paper

Observations of metal elements in some halo or bulge globular clusters and in some elliptical galaxies have shown the α-enhancement phenomenon. Hot subdwarfs are important stars, e.g., they are important sources of far-ultraviolet light in the Galaxy and have successfully been used to explain the UV-upturn in elliptical galaxies. Therefore, we try to study the impacts of α-enhancement on hot subdwarfs. In our calculation, the value of the metallicity is 0.02, all the core masses of hot subdwarfs are 0.475 M &sun;, and the envelope masses of the hot subdwarfs are 0.001, 0.005 and 0.016 M &sun;, respectively. We find that the influences of α-enhancement on luminosity and evolutionary age of hot subdwarfs are not visible. But α-enhancement can make the effective temperatures of hot subdwarfs become higher, and the thicker their envelopes are, the more obvious this influence is.

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