Observations of the GUM Nebula with a Fabry-Perot spectrometer

Details Observations of the GUM Nebula with a Fabry-Perot spectrometer Observations of the GUM Nebula with a Fabry-Perot spectrometer

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..151r&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 1, p. 151-153, 155-158.

Astronomy and Astrophysics

Astrophysics

69

Emission Spectra, Fabry-Perot Spectrometers, Forbidden Transitions, Gum Nebula, H Alpha Line, Interstellar Gas, Electron Density (Concentration), Gas Expansion, Line Spectra, Radial Velocity, Spectral Line Width, Spectrum Analysis

Scientific paper

Scans 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.-

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