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Time variations of interstellar water masers in HII regions

White, G. J. and Macdonald, G.H. (1979). Time variations of interstellar water masers in HII regions. Monthly Notices of the Royal Astronomical Society, 188 pp. 745–764.

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Fourteen water maser sources associated with HII regions have been monitored over the period September 1974-May 1977. Time variations have been observed with a range of time-scales from days to years. A statistical analysis of the short- and long-term variations is performed and related variability in features of similar velocity is examined. The time variations must be due to changes in the pump input, geometry or other physical properties of the maser regions but at present no adequate theory exists to describe the complex behavior observed.

Item Type: Journal Item
Copyright Holders: 1979 Royal Astronomical Society
ISSN: 1365-2966
Keywords: HII regions; interstellar masers; spectrum analysis; water masers; water vapor; annual variations; astronomical catalogs; physical properties; radio emission; statistical analysis; stellar evolution
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 33276
Depositing User: G. J. White
Date Deposited: 28 Mar 2012 13:20
Last Modified: 08 Dec 2018 13:36
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