H2O in W51 main - an expanding bubble around a young massive star

Details H2O in W51 main - an expanding bubble around a young massive star H2O in W51 main - an expanding bubble around a young massive star

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78..239g&link_type=abstract

Astronomy and Astrophysics, vol. 78, no. 2, Sept. 1979, p. 239-247.

Astronomy and Astrophysics

Astronomy

30

O Stars, Radio Astronomy, Stellar Envelopes, Stellar Evolution, Very Long Base Interferometry, Water Masers, Bubbles, Cloud Cover, H Ii Regions, Red Shift, Stark Effect, Stellar Atmospheres, Stellar Winds, Zeeman Effect

Scientific paper

Results are reported for detailed VLBI observations at 22 GHz of the low- and high-velocity H2O maser emissions in the strong water-vapor source W51 Main. The observations are shown to support the idea that the low- and high-velocity H2O emissions are associated with the same source, which is probably a newly formed O star. A qualitative model of W51 Main is proposed which involves an O star of about 30 solar masses surrounded by a differentially rotating and expanding disk with a size of 5 x 10 to the 15th to 3 x 10 to the 16th cm. In this model the star shoots an intense variable stellar wind out of the plane of the disk and also probably produces an ultracompact H II region in the wind zone, which could be prevented from expanding in the plane of the disk. In addition, this wind, or a wind-driven shell, creates a bubble in a dense molecular cloud located behind the star, as seen from earth.

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