Precessing circumstellar disk models for the H2O maser sources S252A and W31A

Details Precessing circumstellar disk models for the H2O maser sources S252A and W31A Precessing circumstellar disk models for the H2O maser sources S252A and W31A

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..465b&link_type=abstract

Astronomy Reports, Volume 42, Issue 4, July 1998, pp.465-468

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Some models for H2O maser sources are considered. For S252A and W31A, a model with a circumstellar gas-dust disk explains the data best. The disk precesses in the gravitational field of a rotating external torus. Maser condensations are located on the inner surface of the torus. The main arguments in favor of this model are the absence of nearby compact H II regions, the regular radial-velocity drift of the H2O maser emission, and the asymmetric shape of the radial-velocity distributions of the maser condensations.

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