The spatial distribution and apparent sizes of SiO masers toward several late type variable stars and toward the star-forming region in Orion have been measured using the 75 km baseline between the 37 m telescope of Haystack Observatory and the 14 m telescope of the Five College Radio Astronomy Observatory. The fringe spacing is 0.02 arcsec and the transitions observed were the υ = 1, J = 1 - 0 and υ = 2, J = 1 - 0 lines at 43 GHz. The data were obtained in September 1979 and April 1982.
VLBI and Compact Radio Sources
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