Critical Steps in Population Synthesis Alessandro Bressan MAGPOP Summer School - Budapest, Hungary, 2006. August 23-25.

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Presentation transcript:

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