Circumstellar molecular maser emission of AGB and post-AGB stars

Author:

Rudnitskij GeorgijORCID,Ashimbaeva Nuriya,Colom Pierre,Lekht Evgeny,Pashchenko Mikhail,Tolmachev Alexander

Abstract

AbstractResults of long-term studies of circumstellar molecular maser emission of late-type giant and supergiant variable stars are reported. In the 1.35-cm H2O line, the peak flux density correlates with the optical brightness lagging behind it by 0.3–0.4 P (P is the stellar period). “Superperiods” of 10 to 15 P are visible in several stars, demonstrated as high maxima in the visible light curve and associated flares in the H2O maser line. In the 18-cm OH lines, full polarization of the maser emission has been measured. Variable Zeeman patterns suggesting a changing magnetic field of a few milligauss have been detected.

Publisher

Cambridge University Press (CUP)

Subject

Astronomy and Astrophysics,Space and Planetary Science

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