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VLBI observations of the SiO maser in Orion

DOI

30

Citations

0

References

1979

Year

R. Genzel, J. M. Moran, A. P. Lane, C. R. Predmore, Paul T. P. Ho, S. S. Hansen, M. J. Reid
The Astrophysical Journal

Abstract

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.