Sanna, N.; Bono, G.; Stetson, P. B.; Pietrinferni, A.; Monelli, M.; Cassisi, S.; Buonanno, R.; Sabbi, E.; Caputo, F.; Castellani, M.; Corsi, C. E.; Degl'Innocenti, S.; Drozdovsky, I.; Ferraro, I.; Iannicola, G.; Nonino, M.; Prada Moroni, P. G.; Pulone, L.; Romaniello, M.; Walker, A. R.
Bibliographical reference
The Astrophysical Journal Letters, Volume 699, Issue 2, pp. L84-L87 (2009).
Description
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 onboard 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.
Based on observations collected with the ACS and the WFPC2 onboard the
HST.
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