Models of Circumstellar Maser in Late-Type Variable Stars

Details Models of Circumstellar Maser in Late-Type Variable Stars Models of Circumstellar Maser in Late-Type Variable Stars

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.251..263r&link_type=abstract

Astrophysics and Space Science, Volume 251, Issue 1-2, pp. 263-266

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

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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