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1999MNRAS.307..619B - Mon. Not. R. Astron. Soc., 307, 619-636 (1999/August-2)
The Sagittarius Dwarf Galaxy Survey (SDGS) - II. The stellar content and constraints on the star formation history.
BELLAZZINI M., FERRARO F.R. and BUONANNO R.
Abstract (from CDS):
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 dSph is derived. According to this scheme, star formation began at a very early time from a low metal content interstellar medium and lasted for severalGyr, coupled with progressive chemical enrichment. The star formation rate (SFR) had a peak from 8 to 10Gyr ago, when the mean metallicity was in the range -1.3≤[Fe/H]≤-0.7. After that maximum, the SFR rapidly decreased and a very low rate of star formation took place until ∼1-0.5Gyr ago.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): techniques: photometric - astronomical data bases: miscellaneous - surveys - stars: formation - galaxies: individual: Sgr dSph - Local Group
Simbad objects: 16
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