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Observations of the Gum Nebula with a Fabry-Perot spectrometerScans have been made of H-alpha, 6584-A forbidden N II, 5007-A forbidden O III, and 5876-A He I emissions in selected directions in the Gum Nebula. Analyses of the line profiles and line intensities indicate that much of the emitting gas in the Gum Nebula is confined to an expanding shell which has a radius of about 125 pc, an expansion velocity of approximately 20 km/s, an emission measure which ranges from about 15 units to about 500 units, and a temperature near 11,000 K. The ultraviolet flux from zeta Pup and gamma-2 Vel appears to be capable of producing most of the observed ionization, although the origin of the shell structure and high expansion velocity is not certain.-
Document ID
19760037049
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Reynolds, R. J.
(Wisconsin, University Madison, Wis., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 203
Subject Category
Astronomy
Accession Number
76A20015
Funding Number(s)
CONTRACT_GRANT: NSF GP-43932
CONTRACT_GRANT: NGR-50-002-242
CONTRACT_GRANT: NSF GA-40146
Distribution Limits
Public
Copyright
Other

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