VLBI observations of the SiO maser in Orion

Details VLBI observations of the SiO maser in Orion VLBI observations of the SiO maser in Orion

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231l..73g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 231, July 15, 1979, p. L73-L76.

Astronomy and Astrophysics

Astronomy

42

Interstellar Masers, Orion Nebula, Protostars, Silicon Oxides, Stellar Envelopes, Very Long Base Interferometry, Water Masers, Infrared Astronomy, Millimeter Waves, Stellar Radiation, Variability

Scientific paper

VLBI observations of the v = 1, J = 1 - 0 SiO maser transition at 43 GHz from the Kleinmann-Low (KL) nebula in Orion are reported. The blueshifted (-6 km/s) and redshifted (19 km/s) 'shell' features are found to originate from the same position on the sky, indicating that these features are associated with a single star. It is suggested that the SiO, H2O, and possibly OH lines at about -6 and +16 km/s probably arise from the same source in the Orion-KL region. The variability of the SiO emission and IR emission from the 'shell source' are discussed. A model is considered in which the maser emission originates from the front and the back of a thick expanding (or contracting) circumstellar shell.

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