Download presentation
Presentation is loading. Please wait.
Published byWilla Glenn Modified over 9 years ago
1
Stellar AGB evolution and its impact on galaxy spectrophotometric properties at low and high redshift: an updated view Alberto Buzzoni INAF – Oss. Astronomico di Bologna, Italy
2
UV evolutionary paths for (old) low-mass stars Dorman et al. (1993) Core mass Renzini & Buzzoni (1986)
3
EHB stars Brown et al. (1999) Castellani et al. (2006)Buson et al. (2006) Low Z High Z Vassiliadis & Wood ‘94 Dorman et al. ‘93 (high-mass) MS
4
Back-in-time HB evolution Buzzoni (1989) Brown et al. (2000) HB temperature distribution
5
Buzzoni, Arnaboldi & Corradi (2006) The puzzling problem of Planetary Nebulae Weidemann (2000)
6
PNe and galaxy environment UV enhancedUV poor
7
Probing AGB extension
8
Mass loss & SB magnitudes Reimers’s law
9
“Unconventional” fates
10
AGB deployment and UV upturn (when infrared speaks to ultraviolet) No PNe Buzzoni & Gonzàlez-Lòpezlira (2007) data compilation from Cantiello et al. (2003)
11
Toward a unitary picture? O’Connell (1999) UV enhanced UV poor Metal richMetal poor Globular clusters AGB ~ RGB [Fe/H] lowest (« -0.5 dex) η highest (0.4-0.5) Core mass low (~0.54 Mo) HB blue PN poor rate Metal-rich GCs & dE’s AGB >> RGB [Fe/H] intermediate (< 0.0 dex) η lowest (0.0-0.1 ?) Core mass highest (~0.65 Mo) HB red PN yes “standard” rate Ellipticals AGB > 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 galaxies AGB >> RGB η VERY high (»1.5 ?) Core mass highest (0.7-0.8 Mo) HB red PN yes “standard” rate UV enhanced? yes but due to young
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.