Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7513l&link_type=abstract
HST Proposal ID #7513
Other
Hst Proposal Id #7513 Galaxies
Scientific paper
We propose to obtain STIS spectroscopy of 2 giant HII regions over the wavelength range 1200 Angstrom -- 10000 Angstrom. All objects show Wolf-Rayet features in the optical, suggesting ages of 3 -- 6 Myr. Therefore the starburst age, which is often diffi cult to disentangle from other parameters, is known a priori. The metallicity range is between 1/10 solar and slightly below solar. The observations will provide an important consistency test for the latest generation of starburst models. The nebular emi ssion-line spectrum will be modeled with a photoionization code using stellar spectra from evolutionary synthesis models. The stellar continuum and absorption-line spectrum in the ultraviolet offers a second, independent method to constrain the hot stell ar population. Strong, blueshifted stellar-wind lines of C IV and [S II]v will be visible in this spectral range. We will derive the properties of the massive-star population both from the nebular spectrum and from the ste llar-wind lines. The use of HS T al lows us to observe the entire spectral range through the same slit. Comparison of the results will shed light on the maturity of these new evolutionary synthesis techniques.
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