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Ultraviolet, visual, and infrared observations of the WC7 variable HD 193793Low-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.
Document ID
19820049639
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fitzpatrick, E. L.
(Washburn Observatory Madison, WI, United States)
Savage, B. D.
Sitko, M. L.
Date Acquired
August 10, 2013
Publication Date
May 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
82A33174
Funding Number(s)
CONTRACT_GRANT: NSG-5363
Distribution Limits
Public
Copyright
Other

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