Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..597v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 3/OCT1, P. 597, 1993
Astronomy and Astrophysics
Astronomy
6
Line: Profiles - Masers - Radiative Transfer - Circumstellar Matter - Stars: Distances - Radio Lines: Stars
Scientific paper
We use a model presented earlier to address several outstanding questions about the 161 2-MHz masers in OH/IR stars. First, we explore the parameter values for modelling the masers, and show that the appearance of the masers has no strong dependence on the shell thickness, OH density or velocity distribution of the OH molecules. Secondly, we examine the possible mismatch between angular size and phase-lag size, which may affect distance estimates. Such an effect may arise because of the anisotropy of the maser emission, but is found to be small. Finally, we discuss the presence of maser emission of high brightness temperature in the blueshifted peak, and show that it is indeed possible that this effect is caused by amplified stellar emission.
Spaans Marco
van Langevelde Hubrecht Jan
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