Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies

Details Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nqsa.conf...59h&link_type=abstract

New Quests in Stellar Astrophysics. II. Ultraviolet Properties of Evolved Stellar Populations, Proceedings of the International

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

The discovery of an excess of light in the far-ultraviolet (UV) spectrum in elliptical galaxies was a major surprise in 1969. While it is now clear that this UV excess is caused by an old population of hot helium-burning stars without large hydrogen-rich envelopes rather than young stars, their origin has remained a mystery. Here we show that these stars most likely lost their envelopes because of binary interactions, similar to the hot subdwarf population in our own Galaxy. This has major implications for understanding the evolution of the UV excess and of elliptical galaxies in general. In particular, it implies that the UV excess is not a sign of age, as had been postulated previously, and predicts that it should not be strongly dependent on the metallicity of the population.

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