Models of Circumstellar Maser in Late-Type Variable Stars |
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| Authors: | GM Rudnitskij |
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| Institution: | (1) Sternberg Astronomical Institute, Moscow State University, 13 Universitetskij prospekt, Moscow, 119899, Russia |
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| Abstract: | The database of observations of H2O maser variability in a sample of late-type variable stars (oxygen-rich Miras and semiregulars) is analyzed. Some regularities
of the H2O variability are traced: in most of the stars studied, the H2O flux peaks soon after visual light maxima with a phase delay Δϕ ranging between 0.1 and 0.3 P. The models considered involve the effects of pulsation-induced shock waves: direct impact
of a shock on the masering layer in the circumstellar envelope or amplification of the radio continuum, produced by the postshock
ionized gas near light maxima, by pumped H2O molecules.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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