Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.6616g&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #66.16; Bulletin of the American Astronomical Society, Vol. 30, p.917
Astronomy and Astrophysics
Astronomy
Scientific paper
We have analyzed three HST fields in the outer disk of the Large Magellanic Clouds at different azimuthal positions to determine the star formation history in these regions. We do not detect any strongly significant differences in the stellar populations of the three fields based on the morphologies of the color-magnitude diagrams and the luminosity functions, suggesting similar star formation histories in these regions. We compare the observed stellar population with those predicted from several simple star formation histories suggested in the literature. The only model validated by the observations is one in which the star formation rate is roughly constant for most of the LMC's history and then increases by a factor of three about 2 Gyr ago. Such a model has roughly equal numbers of stars older and younger than 4 Gyr, and thus is not dominated by young stars. An analysis of the lower main sequence in our fields does not support the suggestion of Zaritsky & Lin (AJ 114:2545) for an intervening stellar population towards the LMC.
Geha Marla
Holtzman Jon
Wfpc-2 Idt
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