Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8255k&link_type=abstract
HST Proposal ID #8255
Other
Hst Proposal Id #8255 Field Stellar Populations
Scientific paper
We propose to observe the closest known large low surface brightness {LSB} galaxy, UGC 2302, in order to resolve for the first time the massive stars and tip of the red giant branch in such a system. Large LSBs represent an extreme star formation environment, both locally within their disks, and on a larger scale, often residing in underdense regions of the universe. Resolving the underlying stellar component of such a galaxy can provide critical information on how stars form and evolve in low metallicity, yet gas-rich environments. The combination of this data with planned near-infrared, abundance and molecular gas studies, existing optical UBVRI and Halpha data, and a VLA HI map, will allow comparison between the abundance and distribution of stars, star formation, and neutral gas in unprecedented detail for disk LSBs. In addition, determination of the characteristics of even the brightest stars in this galaxy will provide a key calibration of the relative contribution o f the brightest main sequence, gia nt, and supergiant stars to the optical and near-infrared colors. This calibration can then be applied to determining the underlying stellar populations of other massive LSB galaxies using broad-band filters.
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