Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6569m&link_type=abstract
HST Proposal ID #6569
Physics
Hst Proposal Id #6569 Stellar Populations
Scientific paper
We propose to exploit the resolution of the WFPC2 to obtain U, V, R, and I and narrow band H Alpha and O III images of an optimally-selected sample of three local dwarf starburst galaxies in order to understand the mechanism of star formation in these systems. These objects have O III equivalent widths greater than 50Angstrom. These dwarf galaxies are close enough that massive stars can be resolved by HST and are extremely important local laboratories for the study of star formation. This type of low luminosity irregular galaxy has been shown to evolve significantly from redshifts of 0.5 - 1 to the current epoch {Glazebrook et al. 1995, Driver et al. 1995, Lilly et al. 1995} in contrast to the more luminous population of early type systems that do not seem to evolve. The understanding of the evolutionary processes in these systems is unclear but interactions, merging, and general starburst activity seem to play a major role. Our detailed study of the sample proposed here may be of significant help in understanding the physics of these objects and there evolution. Many fundamental questions about the essential physical nature of these and larger starburst systems remain unanswered including: {1} is the mass function of a burst restricted to the high mass end; {2} does it depend on metallicity; {3} what physical mechanisms actually trigger the burst. Our HST data will have sufficient spatial resolution to resolve isolated individual high mass main sequence stars and super giants and to distinguish clusters similar to R136A.
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