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Optical spectrophotometry of Wolf-Rayet galaxiesWe have obtained long-slit optical spectra of 10 Wolf-Rayet galaxies and four other starburst galaxies. Using the nebular emission lines we have determined the electron temperatures, electron densities, extinctions, oxygen abundances, mass of ionized hydrogen, and numbers of ionizing photons due to hot stars in these galaxies. The various forbidden line ratios clearly indicate a stellar origin for the emission-line spectrum. From the flux of the broad He II 4686 A emission feature we have estimated the number of Wolf-Rayet stars present. We have accounted for the contribution of these stars to the total ionizing flux and have calculated the ratio of the number of these stars to the number of O stars. Wolf-Rayet galaxies are among the youngest examples of the starburst phenomenon, which we observed at a propitious moment.
Document ID
19930037490
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vacca, William D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Conti, Peter S. (Joint Inst. for Lab. Astrophysics; Colorado Univ. Boulder, United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 401
Issue: 2
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-1216
CONTRACT_GRANT: NSF AST-90-15240
CONTRACT_GRANT: NAS5-26555
Distribution Limits
Public
Copyright
Other