Modeling of The Hydrogen Maser Disk in MWC349

Details Modeling of The Hydrogen Maser Disk in MWC349 Modeling of The Hydrogen Maser Disk in MWC349

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1705s&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #17.05; Bulletin of the American Astronomical Society, Vol. 24, p.1148

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new theoretical results on the high gain hydrogen recombination line millimeter maser discovered in the hot emission line star MWC349. Numerical modeling of the maser amplification in a circumstellar Keplerian disk closely reproduces the observed maser line profiles --- double-peaked with a residual central intensity --- and allows us to solve for the disk parameters including the optical dimensions, upper limits to the kinetic temperature and microturbulence, and the relative width of the masering ring. The model also allows us to specify approximately the electron density and its radial distribution, the dimensions of the maser spots themselves relative to their separation, and their brightness temperature. An important feature of the model is the self-consistent inclusion of the continuous free-free absorption, which naturally explains the shape of the observed spectrum, and the systematic change seen in the different frequency maser's peak radial velocities.

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