Microwave OH maser emission in the circumstellar envelopes of late-type stars

Details Microwave OH maser emission in the circumstellar envelopes of late-type stars Microwave OH maser emission in the circumstellar envelopes of late-type stars

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.291..382b&link_type=abstract

Nature, vol. 291, June 4, 1981, p. 382-385.

Astronomy and Astrophysics

Astronomy

60

Astronomical Spectroscopy, Hydroxyl Emission, Interstellar Masers, Late Stars, Microwave Emission, Stellar Envelopes, Angular Resolution, Antenna Arrays, Giant Stars, High Resolution, Radio Telescopes, Stellar Mass Ejection, Stellar Spectrophotometry, Supergiant Stars, Very Large Array (Vla)

Scientific paper

Initial results are presented of measurements of the total angular extents and absolute positions of OH maser clouds surrounding 20 red giant and supergiant stars. The measurements were made with the Very Large Array at a spatial resolution of approximately 1.2 arcsec in a spectral line mode. Results obtained by integrating separately over the total velocity extents of the low- and high-velocity emission components of each source support a symmetric, expanding shell model for most of the stars, although about half of the stars show a complex structure at the arcsec level. Diameters of the masing regions are found to vary from approximately 100 to greater than 10,000 AU and to be proportional to estimated mass loss rates. The star U Orionis is noted to have an extremely small shell size, which, together with recent observed changes in its OH spectrum, suggests that the star is surrounded by a young expanding envelope whose OH masers have only recently been turned on.

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