New OH main-line detections of OH/IR stars

Details New OH main-line detections of OH/IR stars New OH main-line detections of OH/IR stars

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75.1323d&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, April 1991, p. 1323-1336.

Astronomy and Astrophysics

Astrophysics

13

Emission Spectra, Hydroxyl Emission, Infrared Stars, Masers, Stellar Radiation, Color-Color Diagram, Mira Variables, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution

Scientific paper

A comprehensive survey has been made of the main-line emission from hydroxyl molecules in OH/IR stars. A total of 41 new main-line emission sources are detected, 18 of which show masers in both main lines. The emission velocities generally show double-peaked 'shell structure' which tends to overlap that of the 1612 MHz velocities, suggesting that they may be at the same radius in the stellar atmosphere. A total of 55 stars was detected, most of which show classic double-peaked profiles centered on the stellar velocity. Nine of these stars have stronger emission at 1665 MHz than at 1667 MHz. The velocity correlation among the 1612, 1665, and 1667 MHz lines show a good qualitative support for the idea of competitive gain under saturated maser conditions.

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