Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-03-24
Astronomy and Astrophysics
Astrophysics
21 pages, 12 figures, figg. 1,2,3,5,6,10 and 11 provided in lower resolution format. For full resolution versions see http:/
Scientific paper
10.1046/j.1365-8711.1999.02673.x
A detailed study of the Star Formation History of the Sgr dSph galaxy is performed through the analysis of the data from the Sagittarius Dwarf Galaxy Survey (SDGS; Bellazzini, Ferraro & Buonanno 1999). Accurate statistical decontamination of the SDGS Color - Magnitude diagrams allow us to obtain many useful constraints on the age and metal content of the Sgr stellar populations in three different region of the galaxy. A coarse metallicity distribution of Sgr stars is derived, ranging from [Fe/H]~ -2.0 to [Fe/H]~ -0.7, the upper limit being somewhat higher in the central region of the galaxy. A qualitative global fit to all the observed CMD features is attempted, and a general scheme for the Star Formation History of the Sgr is derived. According to this scheme, star formation began at very early time from a low metal content Inter Stellar Medium and lasted for several Gyr, coupled with progressive chemical enrichment. The Star Formation Rate (SFR) had a peak from 8 to 10 gyr ago when the mean metallicity was in the range -1.3<= [Fe/H] <= -0.7. After that maximum, the SFR rapidly decreased and very low rate star formation took place until ~1-0.5 Gyr ago.
Bellazzini Michele
Buonanno Roberto
Ferraro Francesco R.
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