Old Main-Sequence Turnoff Photometry in the SMC
Abstract
We present ground-based {\it B} and {\it R}-band color-magnitude diagrams (CMDs) of unprecedented depth for twelve fields in the Small Magellanic Cloud (SMC). They reach the oldest main-sequence turnoffs and cover a wide range of galactocentric distances up to from the SMC center, and are located at different position angles. A picture of the stellar content in our SMC fields is presented, through the comparison with theoretical isochrones. Our study confirms the existence of strong population gradients and spatial variation in the SMC stellar content. None of the SMC fields presented here are dominated by old stellar populations which proves that at from the SMC center we do not reach an old stellar halo similar to that of the Milky Way.
Keywords
Cite
@article{arxiv.astro-ph/0603319,
title = {Old Main-Sequence Turnoff Photometry in the SMC},
author = {Noelia E. D. Noel and Carme Gallart and Edgardo Costa and Rene A. Mendez},
journal= {arXiv preprint arXiv:astro-ph/0603319},
year = {2007}
}
Comments
2 pages, 2 figures, contributed talk to the 11th Latin American Regional IAU Meeting, Pucon, Chile, 2005. To be published by Revista Mexicana de Astronomia y Astrofisica, Conference Series (rmaa.cls). High resolution figures (noel_n_fig1.eps and noel_n_fig2.eps) are available via ftp from ftp://ftp.iac.es/out/noelia/