Stellar AGB evolution and its impact on galaxy spectrophotometric properties at low and high redshift: an updated view

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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

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UV evolutionary paths for (old) low-mass stars
Renzini Buzzoni (1986)
Core mass
Dorman et al. (1993)
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EHB stars
Castellani et al. (2006)
Buson et al. (2006)
(high-mass) MS
Vassiliadis Wood 94
Low Z
High Z
Dorman et al. 93
Brown et al. (1999)
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Back-in-time HB evolution
HB temperature distribution
Buzzoni (1989)
Brown et al. (2000)
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The puzzling problem of Planetary Nebulae
Buzzoni, Arnaboldi Corradi (2006)
Weidemann (2000)
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PNe and galaxy environment
UV enhanced
UV poor
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Probing AGB extension
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Mass loss SB magnitudes
Reimerss law ?
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Unconventional fates
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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)
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Toward a unitary picture?
Globular clusters AGB RGB Fe/H ? lowest (
-0.5 dex) ? ? highest (0.4-0.5) Core mass ? low
(0.54 Mo) HB ? blue PN ? poor rate
Metal-rich GCs dEs AGB gtgt RGB Fe/H ?
intermediate (lt 0.0 dex) ? ? lowest (0.0-0.1
?) Core mass ? highest (0.65 Mo) HB ? red PN ?
yes standard rate
Ellipticals AGB gt RGB Fe/H ? highest (gt 0.0
dex) ? ? low (0.1-0.3 ?) Core mass ? lowest
(lt0.52 Mo) HB ? blue due to metal-rich PN ? poor
rate
UV enhanced
Spiral galaxies AGB gtgt RGB ? ? 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
Metal rich
Metal poor
UV poor
OConnell (1999)