Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........9k&link_type=abstract
Ph.D. Thesis Indiana Univ., Bloomington.
Astronomy and Astrophysics
Astronomy
Hydroxyl Emission, Line Spectra, Radio Sources (Astronomy), Infrared Stars, Microwaves, Semiregular Variable Stars, Spatial Distribution, Stellar Models
Scientific paper
A search of 70 long-period and semiregular variables and 17 other infrared stars resulted in the detection of microwave OH emission in five of these objects. Each of these sources was found to have OH emission at both main-line frequencies (1665 and 1667 MHz). Upper detection limits to the main-line OH emission flux are given for all stars found not to be sources. Evidence is presented for the regular variation of the combined main-line flux as a function of the periodically varying stellar luminosity, thus indicating that the OH ground-state population is inverted by radiative rather than collisional means. Evidence is also presented for the periodic variation in the velocity of the edges of the circumstellar OH distribution. Several physical mechanisms are investigated in an attempt to explain the observed velocity variations. A model of the circumstellar OH velocity and spatial distribution is presented.
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