Amplification of stellar background by circumstellar masers

Details Amplification of stellar background by circumstellar masers Amplification of stellar background by circumstellar masers

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.141..353s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 141, no. 2, Feb. 1988, p. 353-359.

Astronomy and Astrophysics

Astrophysics

1

Hydroxyl Emission, Interstellar Masers, Late Stars, Stellar Envelopes, Stellar Radiation, Photons, Red Shift, Stellar Luminosity

Scientific paper

The calculations with the use of a simple maser model show that the stellar background contributes negligible to the mean peak intensities at 1612 MHz. Under some conditions, however, the contribution from the central star may constitute a few percent of the mean peak intensity. Such possibility may occur when the thick and large OH envelope is illuminated by a very luminous and extended central star. To compare the theoretical results with observations a sample of 55 OH/IR stars with best known parameters is analyzed. The ratio of the blue-shifted to the red-shifted 1612 MHz peak slightly increases in objects with the largest OH radii. This relation is interpreted in terms of amplification of the stellar photons.

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