A search for expanding supershells of gas around OB associations

Details A search for expanding supershells of gas around OB associations A search for expanding supershells of gas around OB associations

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250l..25c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 250, Nov. 1, 1981, p. L25-L29.

Astronomy and Astrophysics

Astrophysics

41

B Stars, Gas Expansion, Interstellar Gas, O Stars, Stellar Envelopes, Supernova Remnants, Absorption Spectra, Iue, Line Spectra, Nebulae, Stellar Evolution, Stellar Spectra

Scientific paper

The results of a search for giant, rapidly expanding shells of gas surrounding OB associations are recorded. Two out of thirteen nearby associations (Orion and Carina) show supershells of gas with radii of about 100 pc, expansion velocities of about 100 km/sec, and ages of about 400,000 years. Observations of the newly discovered Carina supershell are presented. It is suggested that these features are formed by supernova explosions in the associations. The birthrate of association supernovae than lies between 1.5 x 10 to the -14th/cu pc per/year and 10 to the -13th/cu pc per/year.

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