Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5309h&link_type=abstract
HST Proposal ID #5309
Other
Hst Proposal Id #5309 Galaxies &Amp, Clusters Stellar Populations
Scientific paper
Blue Compact Dwarf galaxies are tiny galaxies that are dominated by intense, compact star-forming regions that contain thousands of massive OB and Wolf-Rayet stars. Thus, they present a different and extreme environment for star formation compared to the Milky Way and other nearby galaxies for the examination of the star formation process. The IMF of the massive stars in these enigmatic galaxies, in fact, is controversial. Global properties and models have been interpretted as showing considerable variation in the IMF with the metallicity of the system, while other studies argue that the IMF is fairly normal. We will resolve this issue by resolving one BCD into individual massive stars for the first time. The galaxy, IZW18, is renowned for its low abundances. We will use UVI-equivalent colors to construct color-magnitude diagrams and luminosity functions for the massive stars and F469N to identify evolved Wolf-Rayet stars. We will also examine the images in order to determine the numbers, physical sizes, and distributions of the star-forming regions. Halpha images will be used to examine the effect of the extreme concentration of massive stars on their environment.
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