Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-27
Astronomy and Astrophysics
Astrophysics
30 pages, 13 figures, accepted for publication in Astronomical Journal
Scientific paper
10.1088/0004-6256/136/3/1039
We present stellar metallicities derived from Ca II triplet spectroscopy in over 350 red giant branch stars in 13 fields distributed in different positions in the SMC, ranging from $\sim$1\arcdeg\@ to $\sim$4\arcdeg\@ from its center. In the innermost fields the average metallicity is [Fe/H] $\sim -1$. This value decreases when we move away towards outermost regions. This is the first detection of a metallicity gradient in this galaxy. We show that the metallicity gradient is related to an age gradient, in the sense that more metal-rich stars, which are also younger, are concentrated in the central regions of the galaxy.
Aparicio Antonio
Carrera Ricardo
Costa Edgardo
Gallart Carme
Mendez Rene A.
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