Computer Science
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135..141r&link_type=abstract
FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic
Computer Science
Mass Loss And Stellar Winds, Supergiant Stars, Magellanic Stream
Scientific paper
The FUSE data for 287 OB stars in the Magellanic Clouds are an unprecedented resource to investigate the behavior of the stellar winds as a function of spectral type, luminosity class, and metallicity. The smaller extinction and interstellar absorption relative to Galactic counterparts render the MC sample more powerful, especially below 1100 Å. IUE provided a comparable Galactic sample at longer UV wavelengths, but HST has yet to do the same in the MCs. An initial FUSE atlas of 47 objects published in 2002 charted several basic trends, including the luminosity (or wind-density) sensitivity of the S IV, P V, and C III profiles, analogous to the previously unique Si IV behavior at longer UV wavelengths; this effect is due to the relatively low ionization of these species except for P V, for which the much lower abundance prevents saturation at lower luminosities. Now we are augmenting our sample by about 150 more objects, to provide better coverage of the parameters and redundancy at some spectral types, as well as to investigate categories of peculiar objects. Some outstanding early results are increased representation of the earliest spectral types (O2-O4), and the extension of the CNO dichotomy between O2 and ON2 spectra to the superionized O VI profiles. This work and subsequent quantitative modeling will improve our understanding of stellar winds, massive stellar evolution, and the integrated spectra of distant starbursts.
Fullerton Alex W.
Rojas Eliceth
Walborn Nolan R.
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