Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pazh....8..165s&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Mar. 1982, p. 165-171.) Soviet Astronomy Letters, vol. 8, Mar.-Apr. 1982, p. 86-90.
Astronomy and Astrophysics
Astronomy
8
Interstellar Radiation, Orion Constellation, Radio Sources (Astronomy), Water Masers, Flares, Magnetic Flux, Spectral Line Width, Stellar Winds
Scientific paper
The flaring H2O maser radio source observed in Orion (at V = + 8 km/sec) was partially unsaturated. The anticorrelation between the line width and intensity, the profile asymmetry, and the changes in the visibility function within the profile are attributable to blending of two components, one of which experienced the flare. The measured polarization parameters imply an electron density less than about 300,000/cu cm in the source and a magnetic field strength of about 0.01 Gauss directed along a position angle of about -15 deg. A physical model of the source is proposed: a gas cloud would be compressed, heated, and accelerated by strong stellar wind arriving from a young star. The CCr process would pump the maser, with atomic hydrogen density of about 100 billion-one trillion/cu cm. If the cloud is a remnant of a circumstellar gas-dust disk, the disk magnetic field should be predominantly azimuthal.
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