Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224...94r&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 94, 95, 97-100.
Astronomy and Astrophysics
Astrophysics
18
Astronomical Spectroscopy, Fabry-Perot Spectrometers, Gas Expansion, Nebulae, Supernova Remnants, Astronomical Models, H Alpha Line, H Ii Regions, Ionized Gases, O Stars, Stellar Winds, Ultraviolet Radiation
Scientific paper
Fabry-Perot scans of H-alpha, forbidden N II at 6584 A, and forbidden O III at 5007 A were made in the direction of a 3.5-deg-diameter, arc-shaped emission region which appears to contain the stellar associations CMa OB1 and CMa R1, a site of very recent star formation. These observations suggest that much of the ionized gas is confined to an expanding shell which has a diameter of about 68 pc and an expansion velocity of about 13 km/s. The shell appears to be heated and ionized by ultraviolet radiation from two O stars within CMa OB1. While this shell may have been produced by a supernova, models involving strong stellar winds or an evolving H II region are not ruled out.
Ogden P. M.
Reynolds Ron J.
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