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Critical Steps in Population Synthesis

Critical Steps in Population Synthesis. Alessandro Bressan. MAGPOP Summer School - Budapest, Hungary, 2006. August 23-25. What is Pop. Synth. An ens e mble of tools used to predict properties of stellar systems. resolved systems C-M diagrams. unresolved systems

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Critical Steps in Population Synthesis

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  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 propertiesof 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. UnresolvedSystems Bertone et al 05

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

  9. Y2(Yonsei-Yale) Isochrones • (Demarque, Yi et al. 83-06..) • http://www.astro.yale.edu/demarque/yyiso.html STELLARMODELS • GENEVA GRIDS OF STELLAR EVOLUTION MODELS • Maeder, Meynet, Schaerer et al (84-06..) • http://obswww.unige.ch/~mowlavi/evol/stev_database.html • Padova database of stellar evolutionary tracks and isochroneshttp://pleiadi.pd.astro.it/ • Bertelli, Bressan, Chiosi, Girardi et al (84-06) • 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 • Observationalm Effects: • Completeness • Errors • Real Binaries • LOS Binaries SSP C-M Diagram

  15. Case Study for theEvolution of Low Mass Stars:Globular ClusterNGC5024 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. Stellar Lifetimes LF N(MV) IMF

  24. The Integrated Spectrum EVOLUTIONARY TRACKS STELLAR ATMOSPHERES Theoretical Isochrone Isochrone

  25. Atmosph. Models vs Observ.

  26. High Res Integrated Spectrum G4300 Ca4227

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