Water vapor maser 'turn-on' in the HII region W3 /OH/

Details Water vapor maser 'turn-on' in the HII region W3 /OH/ Water vapor maser 'turn-on' in the HII region W3 /OH/

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sci...198.1153h&link_type=abstract

Science, vol. 198, Dec. 16, 1977, p. 1153-1155. NSF-supported research.

Astronomy and Astrophysics

Astronomy

16

H Ii Regions, Hydroxyl Emission, Interstellar Masers, Radiant Flux Density, Spectrum Analysis, Water Masers, Astronomical Models, Cosmic Dust, Infrared Radiation, Interstellar Gas, Luminous Intensity, Maser Outputs, Stellar Envelopes, Stellar Temperature

Scientific paper

A line in the water vapor maser spectrum of the HII region W3 (OH) was observed to increase in brightness over an 8-day period and then decline to its original intensity over the following 4 weeks. The intensity variation can be explained by a simple maser model, with an impulse of energy suddenly applied. The observed time scale and energy output are consistent with a maser on the outskirts of a dust cocoon surrounding an O5 star, with a momentary 'leak,' lasting a day or two, supplying the necessary energy.

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