Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..578f&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 15, 1982, p. 578-593.
Astronomy and Astrophysics
Astronomy
23
Carbon Stars, Infrared Astronomy, Ultraviolet Astronomy, Variable Stars, Wolf-Rayet Stars, Atomic Spectra, Interstellar Extinction, Iue, Line Spectra, Stellar Winds
Scientific paper
Low-resolution IUE data are used to explore the ultraviolet extinction toward the Wolf-Rayet star HD 193793 and to search for ultraviolet variability that might relate to the infrared variability. High-dispersion IUE observations are used to investigate the nature of the stellar wind of the star and to search for anomalies in the interstellar line spectrum that might be expected to be found toward a star that has recently formed a dust shell. Finally, the ultraviolet and new visual and infrared data are combined to investigate the full energy distribution of this unusual source. The energy distribution is found to extend from 0.12 to 12.5 microns, and the ultraviolet data suggest a normal WC-7 type star. A wind terminal speed of about 3000 km/s is implied by the data, as well as an E(B-V) value of 0.85. The dereddened ultraviolet to visual energy distribution is consistent with a star having effective temperature of about 43,000 K.
Fitzpatrick Edward L.
Savage Blair. D.
Sitko Michael L.
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