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Evolution of 1612 MHz Maser Emission in Expanding Circumstellar Shells

M. D. Gray D. A. Howe·B. M. Lewis
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Abstract

Observations show that 1612 MHz masers of OH/IR stars can fade on a timescale of a decade. This fading is probably associated with the switch from rapid mass loss, which is ultimately linked with an internal He-shell flash, to the much slower mass loss supported by more quiescent conditions. We study the observed maser decay with a composite computational model, comprising a time-dependent chemical model of the envelope, and a radiation transfer model which provides the maser pumping. Our combined model is able to reproduce the rapid decay of maser intensity, following a sudden drop in the stellar mass-loss rate. The explanation for the rapid fall in maser emission is not a fall in the OH number density, or the kinetic temperature in the inverted layers, but the loss of a radiative pump route which carries population from level 1 to level 4 via levels 16, 15 and 11. The loss of these pump routes is a result, in turn, of a greatly reduced energy density of 53 micron radiation.

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M. D. Gray D. A. Howe, B. M. Lewis. 2005-09-08. Evolution of 1612 MHz Maser Emission in Expanding Circumstellar Shells. https://doi.org/10.1111/j.1365-2966.2005.09591.x

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