UV Excess and AGB Evolution in Elliptical-Galaxy Stellar Populations

Details UV Excess and AGB Evolution in Elliptical-Galaxy Stellar Populations UV Excess and AGB Evolution in Elliptical-Galaxy Stellar Populations

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nqsa.conf...51g&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

Scientific paper

The puzzling origin of the ``UV-upturn'' phenomenon, observed in some elliptical galaxies, has recently been settled by identifying hot HB stars as main contributors to galaxy ultraviolet luminosity excess. While a blue HB morphology seems a natural characteristic of metal-poor stellar populations, its appearance in metal-rich systems, often coupled with a poorer rate of planetary nebulae per unit galaxy luminosity, might be calling for an intimate connection between UV excess and AGB properties in early-type galaxies. In this work, we want to briefly assess this issue relying on infrared surface brightness fluctuations as a powerful tool to trace AGB properties in external galaxies with unresolved stellar populations.

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