Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6716s&link_type=abstract
HST Proposal ID #6716
Physics
Hst Proposal Id #6716 Stellar Populations
Scientific paper
We propose to obtain deep WFPC2 images in far-UV { 1700 A}, U, V, and I bandpasses of the stellar populations in four nearby galaxies known from their observed FUV luminosities to be forming massive {OB} stars. Our primary goals are to determine the total intensity and spatial distribution of recent {t < 100 Myr}, massive star formation, to confirm the suspected presence of ``super star-clusters'', and to measure their basic properties. We will utilize the superior spatial resolution of HST to completely determine the young stellar populations in these systems. Extinction, ages, IMFs, radiative and kinetic luminosities for the star cluster population will be derived by comparing observed colors with those obtained from evolutionary synthesis models of young starbursts. We have carefully chosen our sample based on their measured FUV flux and morphology as found in images recently obtained with the Ultraviolet Imaging Telescope {UIT}, and their ability to be resolved on parsec scales with HST. These data will allow us to map the spatial pattern of massive star formation and derive detailed star formation histories. The proposed observations will provide fundamental insight into the physics of massive star formation on galactic scales, and serve as a template for understanding massive star formation in more distant systems.
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