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.
CITATION STYLE
González-Lópezlira, R. A., & Buzzoni, A. (2009). UV excess and AGB evolution in elliptical-galaxy stellar populations. In Astrophysics and Space Science Proceedings (Vol. 0, pp. 51–57). Springer Science and Business Media B.V. https://doi.org/10.1007/978-0-387-87621-4_7
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