On the stellar content of the starburst galaxy IC10
Abstract
We investigate the stellar content of the starburst dwarf galaxy IC10 using accurate and deep optical data collected with the Advanced Camera for Surveys and with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The comparison between theory and observations indicates a clear change in age distribution when moving from the center toward the external regions. Moreover, empirical calibrators and evolutionary predictions suggest the presence of a spread in heavy element abundance of the order of one-half dex. The comparison between old and intermediate-age core He-burning models with a well defined overdensity in the color-magnitude diagram indicates the presence of both intermediate-age, red clump stars and of old, red horizontal branch stars.
Keywords
Cite
@article{arxiv.0905.2580,
title = {On the stellar content of the starburst galaxy IC10},
author = {N. Sanna and G. Bono and P. B. Stetson and A. Pietrinferni and M. Monelli and S. Cassisi and R. Buonanno and E. Sabbi and F. Caputo and M. Castellani and C. E. Corsi and S. Degl'Innocenti and I. Drozdovsky and I. Ferraro and G. Iannicola and M. Nonino and P. G. Prada Moroni and L. Pulone and M. Romaniello and A. R. Walker},
journal= {arXiv preprint arXiv:0905.2580},
year = {2009}
}
Comments
7 pages, 4 figures, 1 table. Accepted for publication in ApJL