The nature of the nebula near Gamma Cygni

Details The nature of the nebula near Gamma Cygni The nature of the nebula near Gamma Cygni

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..695b&link_type=abstract

(Astronomicheskii Zhurnal, vol. 55, Nov.-Dec. 1978, p. 1222-1227.) Soviet Astronomy, vol. 22, Nov.-Dec. 1978, p. 695-698. Trans

Astronomy and Astrophysics

Astronomy

1

Collision Parameters, Gas Heating, Interstellar Gas, Nebulae, Supernovae, Astronomical Models, Bow Waves, H Alpha Line, Hydrogen Clouds, Shock Waves, Visual Observation

Scientific paper

A model is proposed whereby the Gamma Cyg nebula is the result of a collision between a nonradiating gas, swept up by an expanding supernova remnant, and a dense interstellar cloud. In this model, the collision produces a bow shock in the swept-up gas, and hard radiation from the bow shock heats and ionizes the cloud. This situation is shown to resemble the excitation of an H II region, but with the bow shock playing the role of an exciting star. With this model, the high H-alpha luminosity of the Gamma Cyg nebula can be brought into agreement with the observed low gas velocities.

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