Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..382b&link_type=abstract
Nature, vol. 290, Apr. 2, 1981, p. 382-384. Research supported by the British Council.
Physics
58
Hydroxyl Emission, Infrared Stars, Interstellar Masers, Stellar Envelopes, Variable Stars, Brightness Temperature, Emission Spectra, Gas Density, Size Determination, Spatial Distribution, Stellar Mass
Scientific paper
The 1,612-MHz OH maser emission associated with cool long-period variable stars is generally characterized by two main regions of emission separated in velocity by approximately 10-50 km/s. This has been taken to indicate that the OH lies in an expanding shell surrounding the star, the main peaks originating at the near or far sides of the shell along the line of sight where the maser column lengths may be greatest. The first high-angular resolution measurements of the OH emission from such a source are here presented which demonstrate dramatically that this picture is correct.
Booth Roy S.
Kus Andrzej J.
Norris Ray P.
Porter N. D.
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