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Tracing pumping routes in OH

Published online by Cambridge University Press:  01 March 2007

Malcolm D. Gray ,
D. A. Howe  and
B. M. Lewis
Malcolm D. Gray
Affiliation:
Astrophysics Group, School of Physics & Astronomy, University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom email: [email protected]
D. A. Howe
Affiliation:
Astrophysics Group, School of Physics & Astronomy, University of Manchester, PO Box 88, Manchester M60 1QD, United Kingdom email: [email protected]
B. M. Lewis
Affiliation:
Arecibo Observatory, HC3, Box 53995, Arecibo, PR 00612, U.S.A.
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Abstract

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We introduce a general method of restoring detailed information about the population flow in molecules under non-local-thermodynamic-equilibrium (NLTE) conditions. This information is usually discarded in numerical algorithms which generate only a solution. We apply the method to tracing the pumping schemes for OH in models that represent three common astrophysical maser environments: the envelopes of asymptotic-giant-branch (AGB) stars, the envelopes of red supergiants, and Galactic star-forming regions. In all three of these cases, we show that a large fraction, typically 0.8 or more, of the maser inversion can be recovered from a set of routes that depend on a much smaller fraction (considerably less than 0.1) of the total number of input coefficients to the model. Therefore, these cases display underlying simplicity in the pumping scheme.

Keywords

masersmolecular datamolecular processesradiative transfermethods: numericalstars: AGB and post-AGBstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 17 - 24
Copyright
Copyright © International Astronomical Union 2008

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