Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912305k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #123.05
Mathematics
Logic
Scientific paper
We present a multi-wavelength photometric study of ˜15,000 resolved stars in the nearby spiral galaxy M83 (D=4.61Mpc) based on Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3) observations using four filters: F336W, F438W, F555W, and F814W. We select 50 regions in the spiral arm and inter-arm areas of M83, and determine the age distribution of the luminous stellar population in each region by combining its color-magnitude diagram (CMD) and color-color diagram with the stellar isochrones. To improve stellar age estimates from isochrone fitting on CMDs, we correct for extinction towards each individual star by comparing its colors with predictions from stellar isochrones. We compare the resulting ages of the 50 regions with those determined from several independent methods, including the number ratio of red-to-blue supergiants, the morphological appearance of the regions, and surface brightness fluctuations, and find fairly good agreement between these methods. We find that young stars are much more likely to be found in concentrated aggregates, while older stars are more dispersed. We also compare the typical ages of stars with those of the clusters within the 50 regions. These results are both consistent with a picture where stars form in star clusters and then disperse on short timescales to form the field population. The locations of Wolf-Rayet star candidates are found to correlate with the positions of many of the youngest regions, providing additional support for our ability to accurately estimate ages.
This work is based on Early Release Science observations made by the WFC3 Scientific Oversight Committee. We are grateful to the Director of the Space Telescope Science Institute for awarding Director's Discretionary time for this program.
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