Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.3705l&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #37.05; Bulletin of the American Astronomical Society, Vol. 26, p.918
Astronomy and Astrophysics
Astronomy
Scientific paper
Starburst galaxies produce massive stars at rates which are at least an order of magnitude higher than for comparable star forming regions in our Galaxy. Detection of spectral signatures due to massive, hot stars is restricted to the ultraviolet spectral region, which is inaccessible from the ground. Previous observations with the IUE satellite were limited by the low signal-to-noise and spectral resolution. Therefore a quantitative assessment of the massive star content was hardly possible. HST provides a dramatic improvement over earlier results. Typical starburst galaxies are within the reach of HST, and high-quality spectra below 2300 Angstroms have been obtained. Together with ultraviolet imaging, the HST data allows the study of the population of massive stars using line profiles of, e.g., Si IV or C IV. From a comparison with theoretical models the mass function and the star-formation history can be derived.
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