AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies
  Relying on infrared surface brightness fluctuactions to trace AGB properties in a sample of elliptical galaxies in the Virgo and Fornax clusters, we assess the puzzling origin of the "UV-upturn" phenomenon, recently traced down to the presence of a hot horizontal branch stellar component. We find that the UV-upturn actually signals a profound change in the c-m diagram of stellar populations in elliptical galaxies, involving both the hot stellar component and red-giant evolution. 
Alberto Buzzoni (1), Rosa A. Gonzalez-Lopezlira (2) ((1) INAF -   Osservatorio Astr. di Bologna, Italy, (2) CRyA UNAM, Morel...