Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344404k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #444.04; Bulletin of the American Astronomical Society, Vol. 41, p.326
Astronomy and Astrophysics
Astronomy
Scientific paper
Nearby extremely metal-poor galaxies (XMPGs) are useful objects to understand star formation and evolution of galaxies under chemical conditions close to those in distant near-primordial galactic systems. However, in the present-day universe XMPGs are extremely scarce: fewer than 1% of dwarf galaxies have an oxygen abundance of 12 + log(O/H) < 7.65. Here we present photometric results from HST ACS/HRC observations of the resolved stellar population within CGCG 269-049, one of the most metal-poor dwarf galaxies known to date with 12 + log(O/H) = 7.43 at a distance of only 5 Mpc. Color-magnitude diagrams of resolved stars at progressively larger radial distance from the center show that the stellar content of CGCG 269-049 systematically varies with radius.
Funding for this project was provided by NASA grant GO-10843.01-A from STScI, which is operated by AURA under NASA contract NAS5-26555.
Corbin Michael R.
Jansen Rolf A.
Kim Hwihyun
Windhorst Rogier A.
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