Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718810b&link_type=abstract
American Astronomical Society Meeting 207, #188.10; Bulletin of the American Astronomical Society, Vol. 37, p.1482
Astronomy and Astrophysics
Astronomy
Scientific paper
We present deep VI photometry of three fields in M33's outer regions obtained with HST/ACS. The radial distribution of stellar surface density declines exponentially with increasing galactocentric distance which is indicative of a disk population. However, we find evidence for a flattening of the distribution at the outermost observed radii which could indicate a transition from disk to halo or disk to thick-disk. The color-magnitude diagrams reveal a population with a mix of ages from ˜ 100 Myr to over 2 Gyr. The red giant branch metallicity decreases from -1.1 to -1.3 across all three fields, a gradient consistent with that of the inner disk of M33. Finally, we present preliminary results on the star formation history of these fields using the technique of synthetic CMD fitting.
Support for this work (proposal number GO-9479) was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555.
Barker Michael K.
Geisler Doug
Harding Paul
Sarajedini Ata
Schommer Robert
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