Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9116l&link_type=abstract
HST Proposal ID #9116
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9116 Hot Stars
Scientific paper
In Cycle 7 we successfully applied to carry out a high resolution UV spectroscopic survey of O-stars in the SMC. The primary aim of this program, GO-7437, is to construct a high quality spectral library at low metallicity in order to synthesize the UV spectra of high redshift star-forming galaxies and nearby starbursts. This program is almost completed and in the present proposal we ask to extend the survey to B-stars in the SMC. There are important reasons for doing so. Chief among these is that recent work, some of it prompted by GO-7437 results, indicates that B-stars are significant contributors to the observed UV spectrum of high redshift galaxies such as the important MS 1512-cB58. In the present survey we also propose to extend the wavelength coverage into the near-UV in order to cover the most distinguishing feature in B-star UV spectra, the Fe, iii multiplet between 1900 and 2000Angstrom . This feature is a key diagnostic of B-stars and an excellent discriminant against O-stars. The combined survey of O and B stars will constitute the definitive UV spectral library of massive stars at low metallicity and will offer powerful diagnostic capabilities in many other areas of astronomy, particularly in the area of massive star evolution and its dependence on metallicity and rotation.
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