Twenty-six-year monitoring of water masers

Details Twenty-six-year monitoring of water masers Twenty-six-year monitoring of water masers

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242..330r&link_type=abstract

Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.

Other

Molecular Processes, Radio Lines: Ism, Radio Lines: Stars, Masers, Surveys, Stars: Formation, Stars: Agb And Post-Agb, Circumstellar Matter, Shock Waves

Scientific paper

Since 1980 variability of a sample of H2O maser sources has been monitored on the 22-metre radio telescope in Pushchino, Russia. The interval between successive observational sessions is 1 2 months. The sample includes 125 maser sources in star-forming regions (SFR) and late-type variable stars. Twenty-six-year time series of H2O line profiles have detected flares and velocity drift of spectral features. Very fast variations in the H2O maser flux (Δt 1 hour) have been detected in several SFR sources, in particular, W33B. Variations of circumstellar H2O masers in late-type stars correlate with visual light curves with a time lag of 0.3-0.4P (P is the star's period). Exceptionally strong H2O maser flares were recorded in SFR sources (Sgr B2 and others) and in the stars W Hya, R Cas and U Ori. Models for H2O maser variability are reviewed. For stellar masers shock-wave excitation of H2O line variability is discussed.

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