Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Sagittarius Dwarf spheroidal Galaxy Survey (SDGS) II: The stellar
  content and constraints on the star formation history   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.

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The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th