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spectrophotometry of wolf-rayet stars. i - continuum energy distributionsAll available low-resolution IUE spectra are assembled for Galactic, LMC, and SMC W-R stars and are merged with ground-based optical and NIR spectra in order to collate in a systematic fashion the shapes of these energy distributions over the wavelength range 0.1-1 micron. They can be consistently fitted by a power law of the form F(lambda) is approximately equal to lambda exp -alpha over the range 1500-9000 A to derive color excesses E(B-V) and spectral indices by removing the 2175-A interstellar absorption feature. The WN star color excesses derived are found to be in good agreement with those of Schmutz and Vacca (1991) and Koesterke et al. (1991). Significant heterogeneity in spectral index values was generally seen with any given subtype, but the groups consisting of the combined set of Galactic and LMC W-R stars, the separate WN and WC sequences, and the Galactic and LMC W-R stars all showed a striking and consistent Gaussian-like frequency distribution of values.
Document ID
19930062331
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Morris, Patrick W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brownsberger, Kenneth R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Conti, Peter S.
(Joint Inst. for Laboratory Astrophysics Boulder, CO, United States)
Massey, Philip
(Kitt Peak National Observatory Tucson, AZ, United States)
Vacca, William D.
(Joint Inst. for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 16, 2013
Publication Date
July 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 412
Issue: 1
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1016
CONTRACT_GRANT: NAS5-28731
CONTRACT_GRANT: NSF AST-90-15240
Distribution Limits
Public
Copyright
Other