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.
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© 1997 Springer Science+Business Media Dordrecht
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Rudnitskij, G.M. (1997). Models of Circumstellar Maser in Late-Type Variable Stars. In: Cherchneff, I., Millar, T.J. (eds) Dust and Molecules in Evolved Stars. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1307-8_43
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DOI: https://doi.org/10.1007/978-94-017-1307-8_43
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5018-2
Online ISBN: 978-94-017-1307-8
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