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

2. 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

3. Resolved system: Old Population

4. Resolved system: Young Population

5. Resolved system: “Complex” Population

6. Wide field imaging and Star Formation History in the Local Group Galaxies (Sagittarius) Held et al 04

7. Unresolved Systems Bertone et al 05

8. The Isochrone EVOLUTIONARY TRACKS THEORETICAL ISOCHRONE in the OBSERVED SYSTEM BOLOMETRIC CORRECTIONS MULTI BAND OBSERVATIONS OF STARS

9. STELLAR MODELS Y 2 (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 MODELS Maeder, 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)

10. Phot. Systems

11. The Temperature scale

12. The Bolometric Corrections Bertone et al 05

13. Isochrones

14. The C-M Diagram Isochrone IMF C-M Diagram Observationalm Effects: Completeness Errors Real Binaries LOS Binaries SSP

15. Case Study for the Evolution of Low Mass Stars: Globular Cluster NGC5024 Piotto et al 2002

16. Ev. Tracks with suited composition No TP-AGB in Tracks!

17. Ev. Tracks vs. Isochrones

18. No Binaries- No Errors

19. 10% Binaries

20. Errors & no Binaries

21. Errors and 5% Binaries

22. Errors & 20% Binaries

23. LF IMF Stellar Lifetimes N(M V )

24. The Integrated Spectrum EVOLUTIONARY TRACKS STELLAR ATMOSPHERES Theoretical Isochrone

25. Atmosph. Models vs Observ.

26. High Res Integrated Spectrum Ca4227 G4300