Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8675b&link_type=abstract
HST Proposal ID #8675
Other
Hst Proposal Id #8675 Stellar Populations
Scientific paper
We propose to characterize the young, coeval stellar population discovered with WFPC2 multiband imaging in a NGC6822 star forming region, with follow-up spectroscopy of the massive star candidates. Photometry alone is not sensitive to accurate measurements of temperature and extinction for stars hotter than B2. Blue spectra will provide spectral type classification, and measurements of the stellar temperature, which will allow us to construct meaningful H-R diagrams. UV spectra will provide critical measurements of ionizing luminosities, wind velocity and mass loss. STIS configurations allow a most effective observing strategy: we will take UV spectra in slitless mode, and the optical spectra with the STIS long slit in the G430L range, which will also provide spatially resolved information on the surrounding parent nebula. The UV plus optical spectra will yield a quantitative determination of all stellar parameters, and of the extinction properties, in this extremely metal-poor HII region. This study will provide a step forward in understanding how massive star formation {initial mass function, radiative and dynamical balance} and evolution depend on metallicity and other environmental factors. Resolved studies of local starbursts provide a key to interpret active star-forming distant galaxies. We also request WFPC2 parallel imaging to continue our stellar population study.
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