Monte Carlo solutions for the radiative processes in 1612-MHz OH masers

Details Monte Carlo solutions for the radiative processes in 1612-MHz OH masers Monte Carlo solutions for the radiative processes in 1612-MHz OH masers

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..159s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 159-166.

Physics

23

Hydroxyl Radicals, Masers, Monte Carlo Method, Radiative Transfer, Stellar Envelopes, Stellar Models, Stellar Spectra

Scientific paper

We use a Monte Carlo method to solve the radiative transport in circumstellar OH masers. We model the observed double-peaked 1612-MHz maser emission from expanding molecular shells around highly evolved stars. The whole problem is coded in terms of local physics. Our code can reproduce features like maser saturation and beam crossing, and we discuss its limits. With plausible parameter values from the literature we obtain spectra that resemble the observed spectra quite well. The average shape of OH/IR star spectra can be fully explained by a model of a spherically symmetric, homogeneous and constantly expanding shell.

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