Time variations of interstellar water masers in HII regions

White, G. J. and Macdonald, G. H. (1980). Time variations of interstellar water masers in HII regions. In: Interstellar Molecules, 6-10 Aug 1979, Mont Tremblant, Quebec, Canada, p. 593.

URL: http://adsabs.harvard.edu/abs/1980IAUS...87..593W

Abstract

Previous studies of time variations in water vapour sources associated with HII regions by Sullivan (1971, 1973) and Gammon (1976) have revealed variability on time-scales of 10⁶-10⁷s. Sullivan monitored nine sources over a period of 14 months and Gammon observed W49 (H₂O) for 13 months. In an attempt to gather more complete information on the variability of intertellar water masers we have monitored 18 sources for the 32-month period 1974 September-1977 May.

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