Critical Steps in Population Synthesis Alessandro Bressan MAGPOP Summer School - Budapest, Hungary, August 23-25
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
Resolved system: Old Population
Resolved system: Young Population
Resolved system: “Complex” Population
Wide field imaging and Star Formation History in the Local Group Galaxies (Sagittarius) Held et al 04
Unresolved Systems Bertone et al 05
The Isochrone EVOLUTIONARY TRACKS THEORETICAL ISOCHRONE in the OBSERVED SYSTEM BOLOMETRIC CORRECTIONS MULTI BAND OBSERVATIONS OF STARS
STELLAR MODELS Y 2 (Yonsei-Yale) Isochrones (Demarque, Yi et al ) Padova database of stellar evolutionary tracks and isochrones Bertelli, Bressan, Chiosi, Girardi et al (84-06) GENEVA GRIDS OF STELLAR EVOLUTION MODELS Maeder, Meynet, Schaerer et al ( ) Achim Weiss ( Santi Cassisi ( Oscar Straniero (
Phot. Systems
The Temperature scale
The Bolometric Corrections Bertone et al 05
Isochrones
The C-M Diagram Isochrone IMF C-M Diagram Observationalm Effects: Completeness Errors Real Binaries LOS Binaries SSP
Case Study for the Evolution of Low Mass Stars: Globular Cluster NGC5024 Piotto et al 2002
Ev. Tracks with suited composition No TP-AGB in Tracks!
Ev. Tracks vs. Isochrones
No Binaries- No Errors
10% Binaries
Errors & no Binaries
Errors and 5% Binaries
Errors & 20% Binaries
LF IMF Stellar Lifetimes N(M V )
The Integrated Spectrum EVOLUTIONARY TRACKS STELLAR ATMOSPHERES Theoretical Isochrone
Atmosph. Models vs Observ.
High Res Integrated Spectrum Ca4227 G4300