The time variation of celestial H2O maser.

Details The time variation of celestial H2O maser. The time variation of celestial H2O maser.

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pabei...9..143x&link_type=abstract

Prog. Astron., Vol. 9, No. 2, p. 143 - 150

Astronomy and Astrophysics

Astronomy

Scientific paper

Time variations of both interstellar H2O maser and stellar H2O maser are reviewed. The time scales of the time variation of interstellar masers are divided into two kinds: short and long, and especially, the former may provide a way to study the maser pumping mechanism. Stellar H2O maser are in the circumstellar envelope. The time variations of stellar H2O masers are divided into two kinds: 1. Spectral flux of a stellar H2O maser contains the obvious periodicity; 2. its star is a semi-regular variable and the spectral flux of the stellar H2O maser contains two peaks. The theories of the time variation mechanism of a stellar H2O maser contain the stellar near-infrared pumping mechanism and collisional pumping mechanism of gas molecules in the envelope.

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