Submillimetre water masers in circumstellar envelopes - II. Variability

Details Submillimetre water masers in circumstellar envelopes - II. Variability Submillimetre water masers in circumstellar envelopes - II. Variability

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278..655y&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 2, pp. 655-668.

Other

9

Masers, Circumstellar Matter, Stars: Late-Type, Stars: Variables: Other, Radio Lines: Stars

Scientific paper

Near-simultaneous observations of circumstellar 22-, 321- and 325-GHz water masers have been made at four epochs between 1992 March 1 and 1993 April 17. All nine sources studied have varied significantly, typically by factors of 2 or more, in all lines, and there have been major changes of profile shape in many cases. The 321-GHz line is generally the most variable, having the largest amplitudes of variation and shortest time-scales. Time-scales to vary by a factor of 2 were as short as 3 weeks. The variations in the 22-, 321- and 325-GHz masers are not particularly well correlated: in some cases they are completely anticorrelated. The variability data are presented in detail, and their implications for the H_2O maser excitation are briefly discussed.

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