Models of cosmic maser sources

Details Models of cosmic maser sources Models of cosmic maser sources

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39l..19p&link_type=abstract

Astrophysics and Space Science, vol. 39, Feb. 1976, p. L19-L24.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Models, Brightness Temperature, Galactic Radiation, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Radial Velocity, Shock Wave Propagation, Spatial Distribution, Stellar Envelopes, Stellar Winds, Water Vapor

Scientific paper

Observational properties of Class I and Class IIb compact cosmic maser sources are briefly reviewed, and it is proposed that the maser emission from both types of sources is associated with mass loss by certain starlike objects. Using NML Cyg as an example, the production of 'blue' and 'red' 1612-MHz OH emission is investigated in terms of a shock wave propagating through a disklike circumstellar shell. This model is found to satisfy the conditions that the cool OH layer which absorbs the IR pump radiation should be optically thick in the OH vibrational lines and that its density should be low enough that collisions will not damp the molecular fluorescence. It is suggested that the OH is produced as a result of collisional dissociation of H2O molecules which are knocked out of ice grains by fast hydrogen atoms.

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