IL CONTENUTO STELLARE DELLE
GALASSIE: BASI TEORICHE.
Laura Greggio - OAPd
Ciclo di lezioni sui fondamenti teorici alla base dei metodi interpretativi
in uso per risalire alla storia di formazione stellare in galassie
June 2006
Lectures on Stellar Populations
Carina: Dwarf Spheroidal
Monelli et al. 2004
June 2006
Lectures on Stellar Populations
Large Magellanic Cloud
DISK FIELD
BAR FIELD
Recent enhancement
(from 0.1 Gyr ago)
Enhancement at
3.5 Gyr ago
Old SF
(from 10-3.0 Gyr ago)
Smecker-Hane et al. 2002
June 2006
Lectures on Stellar Populations
NGC 1705 – A Dwarf Blue Galaxy
observations
interpretation
Annibali et al. 2003
June 2006
Lectures on Stellar Populations
Simulations:
Color
Coding
Reflects
AGE(Myr):
<10Myr
10↔60
60↔1000
> 1000
SFR constant from
10 Myr to 2 Gyr ago
SFR constant from
now to 1 Gyr ago
June 2006
Lectures on Stellar Populations
Integrated spectral indices to recover SFH in galaxies
(from Thomas et al. 2005)
June 2006
Lectures on Stellar Populations
Outline of the Course:
•
Summary of Stellar Evolution
Review of general properties of stellar tracks, which determine the
appearance of the HRD and its systematics. Close up on those features
particularly relevant to decode SFH from the data.
•
Theoretical Tools for the Interpretation of the CMDs of Composite
Stellar Populations in terms of SFH
Going from the HRD to the CMD; check of the theoretical models.
Relation between stellar counts in selected regions of the CMD and Mass
of the stellar population.
Simulations of CMDs.
•
Integrated Light of Stellar Populations
Bolometric Magnitudes and contributions from different parts of the HRD;
Magnitudes and Colors; Mass-to-Light ratios; Spectral Indices.
June 2006
Lectures on Stellar Populations