Stellar AGB evolution and its impact on galaxy spectrophotometric properties at low and high redshift: an updated viewAlberto BuzzoniINAF Oss. Astronomico di Bologna, Italy

UV evolutionary paths for (old) low-mass starsDorman et al. (1993)Core massRenzini & Buzzoni (1986)

EHB starsBrown et al. (1999)Castellani et al. (2006)Buson et al. (2006)Low ZHigh ZVassiliadis & Wood 94Dorman et al. 93(high-mass) MS

Back-in-time HB evolutionBuzzoni (1989)Brown et al. (2000)HB temperature distribution

Buzzoni, Arnaboldi & Corradi (2006)The puzzling problem of Planetary NebulaeWeidemann (2000)

PNe and galaxy environmentUV enhancedUV poor

Probing AGB extension

Mass loss & SB magnitudesReimerss law

Unconventional fates

AGB deployment and UV upturn(when infrared speaks to ultraviolet)No PNeNo PNe

Buzzoni & Gonzlez-Lpezlira (2007)data compilation from Cantiello et al. (2003)

Toward a unitary picture?OConnell (1999)UV enhancedUV poorMetal richMetal poorGlobular clustersAGB ~ RGB[Fe/H] lowest ( -0.5 dex) highest (0.4-0.5)Core mass low (~0.54 Mo)HB bluePN poor rateMetal-rich GCs & dEsAGB >> RGB[Fe/H] intermediate (< 0.0 dex) lowest (0.0-0.1 ?)Core mass highest (~0.65 Mo)HB redPN yes standard rateEllipticalsAGB > RGB[Fe/H] highest (> 0.0 dex) low (0.1-0.3 ?)Core mass lowest (> RGB VERY high (1.5 ?)Core mass highest (0.7-0.8 Mo)HB redPN yes standard rateUV enhanced? yes but due to young