Observational tests for H II region models - A 'champagne party'

Details Observational tests for H II region models - A 'champagne party' Observational tests for H II region models - A 'champagne party'

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979msngr..18...12a&link_type=abstract

ESO Messenger, Sept. 1979, p. 12-14.

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Astrophysics, Cloud Physics, H Ii Regions, Electron Density (Concentration), Gas Ionization, Gum Nebula, Hydrogen Ions, Velocity Distribution

Scientific paper

Observations of several neighboring H II regions associated with a molecular cloud were performed in order to test the champagne model of H II region-molecular cloud interaction leading to the supersonic expansion of molecular cloud gas. Nine different positions in the Gum 61 nebula were observed using an image dissector scanner attached to a 3.6-m telescope, and it is found that the area corresponds to a low excitation, high density nebula, with electron densities ranging between 1400 and 2800/cu cm and larger along the boundary of the ionized gas. An observed increase in pressure and density located in an interior region of the nebula is interpreted in terms of an area between two rarefaction waves generated together with a strong isothermal shock, responsible for the champagne-like streaming, by a pressure discontinuity between the ionized molecular cloud in which star formation takes place and the intercloud gas. It is noted that a velocity field determination would provide the key in understanding the evolution of such a region.

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