Computer Science
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2233k&link_type=abstract
HST Proposal ID #2233
Computer Science
Hst Proposal Id #2233
Scientific paper
A detailed quantitative spectroscopic analysis of massive O-stars in the Magellanic Clouds is proposed. The objective is to determine precisely the intrinsic stellar parameters of luminosity, effective temperature, gravity, mass, and chemical composition; and the stellar wind parameters of mass-loss rate and velocity structure in these metal poor irregular galaxies. These parameters will be obtained from detailed NLTE model atmosphere analyses of HST UV-spectra (obtained using the FOS) and ground-based optical high resolution, high S/N spectra already obtained using the ESO 3.6 m telescope. These results in conjunction with our present parallel work on galactic O-stars will give important observational constraints on the evolution of massive stars and the strength of stellar winds as a function of metallicity. This will be a crucial test of stellar and galactic evolutionary scenarios which are all dependent on the rate of mass-loss during the different stellar evolutionary stages.
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