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Critical Steps in
Population Synthesis
Alessandro Bressan
MAGPOP Summer School - Budapest, Hungary, 2006. August 23-25
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What is Pop. Synth.An ensemble of tools used to predict properties of stellar systems
• resolved systems
C-M diagrams
• unresolved systems
Magnitudes (colours)
Spectra
Narrow band indices
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Resolved system: Old Population
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Resolved system: Young
Population
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Resolved system:
“Complex” Population
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Wide field imaging and Star Formation History in the Local Group Galaxies (Sagittarius)
Held et al 04
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UnresolvedSystems
Bertone et al 05
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The Isochrone
EVOLUTIONARYTRACKS
THEORETICAL ISOCHRONE
ISOCHRONEin the
OBSERVED SYSTEM
BOLOMETRICCORRECTIONS
MULTI BANDOBSERVATIONS OF
STARS
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STELLARMODELS
• Y2 (Yonsei-Yale) Isochrones (Demarque, Yi et al. 83-06..)http://www.astro.yale.edu/demarque/yyiso.html
• Padova database of stellar evolutionary tracks and isochrones http://pleiadi.pd.astro.it/
Bertelli, Bressan, Chiosi, Girardi et al (84-06)
• GENEVA GRIDS OF STELLAR EVOLUTION MODELSMaeder, Meynet, Schaerer et al (84-06..)
http://obswww.unige.ch/~mowlavi/evol/stev_database.html
• Achim Weiss (http://www.mpa-garching.mpg.de/stars/index.shtml)
• Santi Cassisi (http://www.te.astro.it/osservatorio/personale/cassisi/)
• Oscar Straniero (http://www.te.astro.it/osservatorio/personale/straniero/oscar.html)
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Phot. Systems
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The Temperature scale
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The Bolometric Corrections
Bertone et al 05
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Isochrones
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The C-M DiagramIsochrone IMF
C-M Diagram
Observationalm Effects:
• Completeness• Errors• Real Binaries• LOS Binaries
SSP
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Case Study for the
Evolution of
Low Mass Stars:
Globular Cluster
NGC5024
Piotto et al 2002
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Ev. Tracks with suited composition
No TP-AGB in Tracks!
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Ev. Tracks vs. Isochrones
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No Binaries- No Errors
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10% Binaries
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Errors & no Binaries
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Errors and 5% Binaries
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Errors & 20% Binaries
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LF
IMF
Stellar Lifetimes
N(MV)
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The Integrated Spectrum
EVOLUTIONARYTRACKS
STELLAR ATMOSPHERES
Theoretical Isochrone
Isochrone
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Atmosph. Models vs Observ.
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High Res Integrated Spectrum
Ca4227
G4300