H2O maser observations of late-type stars

Details H2O maser observations of late-type stars H2O maser observations of late-type stars

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..283e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 283-296.

Astronomy and Astrophysics

Astrophysics

41

Late Stars, Water Masers, Mira Variables, Stellar Envelopes, Supergiant Stars

Scientific paper

Circumstellar water maser emission at 22 GHz was searched for in 62 late-type stars and 26 IRAS sources. Unlike for OH masers, low level maser emission occurs often at the edges of the maser velocity interval. Taking this emission into account, the velocity range of H2O masers covers usually the central 80% of the OH maser velocity interval, consistent with a location of H2O masers inside the OH masing shell. Regarding maser variability, it is found that M-supergiant masers appear rather stable in time, while profiles of semiregular variables vary strongly, with Miras and IRC sources falling in between these two groups. The possible cause for this difference is discussed.

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