Observations of the gum nebula with a Fabry-Perot spectrometer

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Astrophys. J., v. 203, no. 1, pp. 151-158

DOI:https://doi.org/10.1086/154057· OSTI ID:4027967

Reynolds, R J

Scans have been made of H$alpha$, N ii lambda6584, O iii lambda5007, and He i lambda5876 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$sup -1$, an emission measure which ranges from about 15 cm$sup -6$ pc to about 500 cm$sup -6$ pc, and a temperature near 11,000 K. The ultraviolet (h$nu$>13.6 eV) flux from xi Pup and $gamma$$sup 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. (AIP)

• Research Organization: Physics Department, University of Wisconsin, Madison
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-030789
• OSTI ID: 4027967
• Journal Information: Astrophys. J., v. 203, no. 1, pp. 151-158, Journal Name: Astrophys. J., v. 203, no. 1, pp. 151-158; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

*NEBULAE-- SPECTROSCOPY
640105* --Physics Research--Astrophysics & Cosmology-- Galaxies
COSMIC GASES
H2 REGIONS
HELIUM
HYDROGEN
INTERSTELLAR SPACE
IONIZATION
N56500* --Physics (Astrophysics & Cosmology)--Galaxies
NITROGEN
OXYGEN
SUPERNOVAE
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION
VELOCITY