Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vsgh.conf...75b&link_type=abstract
Variable Stars, the Galactic halo and Galaxy Formation, Proceedings of an international conference held in Zvenigorod, Russia, 1
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results of the search for variable stars in a sample of isolated dwarf galaxies of the Local Group, based on very deep HST/ACS data, and show how the properties of these variables reflect details of the star formation history of the galaxies. About 900 variables and candidates have been found in total. Among the confirmed variables, we identified about 700 RR Lyrae stars, 60 Cepheids, and 50 eclipsing binaries. An in-depth study of the RR Lyrae population of the dSph Tucana reveals interesting details about the early evolution of this galaxy, and the origin of its stellar population gradients: we find that the fainter, shorter period RR Lyrae stars--i.e., more metal-rich--are more centrally concentrated than the more luminous, longer period RR Lyrae variables. This suggests that a metallicity gradient must have appeared very early in the history of this galaxy. We also compare the location of the Cepheids found in the galaxies of our sample in the period-luminosity diagram with the Magellanic Clouds Cepheids of the OGLE collaboration, and find that the Cepheids in the gas-rich dwarf galaxies IC1613 and LGS3 are classical Cepheids, while Cetus and Tucana harbor only anomalous Cepheids.
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