Computer Science
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........15d&link_type=abstract
Thesis (PhD). UNIVERSITY OF WASHINGTON, Source DAI-B 60/06, p. 2747, Dec 1999, pages.
Computer Science
3
Scientific paper
A method for the study of star formation histories of resolved galaxies is presented. It is tested with both simulated data of a composite population and observed data of a globular cluster, which is expected to be a single population. The method is then used to study the star formation histories of WLM, the LMC, and LGS 3. For WLM, HST F555W and F814W photometry of a portion of the galaxy is presented, with the chips aligned such that sample of both the bar and halo populations were present in the data. The distance modulus for the globular cluster is calculated to be 24.72 +/- 0.09 from color-magnitude diagram fitting, with [Fe/H] of -1.51 +/- 0.09 and age of 14.8 +/- 0.7 Gyr. The distance is consistent with distances calculated for the cluster HB and the field star TRGB. Large-scale star formation in the galaxy began about 12 Gyr with a short but large burst. Intermediate age star formation rates are uncertain, but the bar has shown increased star formation during the past 1.5 Gyr. The LMC data is ground-based UBV photometry of two fields in the northern part of the disk. A distance modulus of 18.40 +/- 0.05 is calculated. Large-scale star formation began about 12 Gyr ago in this part of the LMC with a large burst, and slowly decreased. A recent burst began between 1.0 and 2.5 Gyr ago, and shows different recent star formation rates in the two fields. The LGS 3 data is HST-based F555W and F814W photometry, and includes most of the galaxy's core and part of the galaxy's halo. The distance modulus is calculated to be 23.89 +/- 0.05, and is consistent with HB and TRGB distances. LGS 3 had two bursts of star formation, one beginning 14.5 +/- 0.8 Gyr ago and one beginning between 2.5 and 5 Gyr ago, and ending at least 200 Myr ago. The recent burst was constrained to the body of the galaxy.
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