stellar agb evolution and its impact on galaxy spectrophotometric properties at low and high...
TRANSCRIPT
Stellar AGB evolution and its impact on galaxy
spectrophotometric properties at low and high redshift: an updated
view
Alberto BuzzoniINAF – Oss. Astronomico di Bologna, Italy
UV evolutionary paths for (old) low-mass
stars
Dorman et al. (1993)
Core mass
Renzini & Buzzoni (1986)
EHB stars
Brown et al. (1999)
Castellani et al. (2006)
Buson et al. (2006)
Low ZHigh Z
Vassiliadis & Wood ‘94
Dorman et al. ‘93
(high-mass) MS
galPN LN /
Buzzoni, Arnaboldi & Corradi (2006)
The puzzling problem of
Planetary Nebulae
Weidemann
(2000)
AGB deployment and UV upturn
(when infrared speaks to ultraviolet)
No PNe
No PNe
Buzzoni & Gonzàlez-Lòpezlira (2007) data compilation from Cantiello et al.
(2003)
Toward a unitary picture?
O’Connell (1999)
UV enhanced
UV poor
Metal richMetal poor
Globular clustersAGB ~ RGB
[Fe/H] lowest (« -0.5 dex)η highest (0.4-0.5)Core mass low (~0.54 Mo)HB bluePN poor rate
Metal-rich GCs & dE’sAGB >> RGB
[Fe/H] intermediate (< 0.0 dex)η lowest (0.0-0.1 ?)Core mass highest (~0.65 Mo)HB redPN yes “standard” rate
EllipticalsAGB > RGB
[Fe/H] highest (> 0.0 dex)η low (0.1-0.3 ?)Core mass lowest (<0.52 Mo)HB blue due to metal-rich PN poor rate
Spiral galaxiesAGB >> RGB
η VERY high (»1.5 ?)Core mass highest (0.7-0.8 Mo)HB redPN yes “standard” rateUV enhanced? yes but due to young