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Preprint typeset using L ATEX style emulateapj v. 03/07/07 THE ACS LCID PROJECT: RR LYRAE STARS AS TRACERS OF OLD POPULATION GRADIENTS IN THE ISOLATED DWARF SPHEROIDAL GALAXY TUCANA 1

By Edouard J. Bernard, Carme Gallart, Matteo Monelli, Antonio Aparicio, Santi Cassisi, Evan D. Skillman, Peter B. Stetson, Andrew A. Cole, Igor Drozdovsky, Sebastian L. Hidalgo, Mario Mateo and Eline Tolstoy

Abstract

We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find that the fainter RR Lyrae stars, having a shorter period, are more centrally concentrated than the more luminous, longer period RR Lyrae variables. Through comparison with the predictions of theoretical models of stellar evolution and stellar pulsation, we interpret the fainter RR Lyrae stars as a more metal-rich subsample. In addition, we show that they must be older than about 10 Gyr. Therefore, the metallicity gradient must have appeared very early on in the history of this galaxy

Year: 2008
OAI identifier: oai:CiteSeerX.psu:10.1.1.313.9373
Provided by: CiteSeerX
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