Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..634d&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 634-646. Research supported by the Five College Radio Astronomy Obse
Astronomy and Astrophysics
Astronomy
51
Masers, Radio Astronomy, Very Long Base Interferometry, H Ii Regions, Hydroxyl Emission, Radiative Transfer, Stellar Envelopes, Water
Scientific paper
A spatial distribution of OH/H2O maser emission in very long baseline interferometry (VLBI) maps is discussed by a term of velocity fluctuations in an expanding cloud. A detailed model is constructed for the OH 1612 MHz emission in OH/IR sources. Intensity distributions of maser emission are calculated for a model of an expanding circumstellar envelope with three-dimensional velocity fluctuations. Calculated maps show that the maser emission spots appear randomly in the whole envelope where the population inversion occurs. It is deduced that the velocity fluctuations with a scale length of about 10 to the 16th cm and an amplitude of 1-2 km/sec are present in the circumstellar envelopes of OH/IR sources. The OH number density in the envelope is calculated for various mass loss rates. An application of the theory to the OH/H2O sources associated with H II regions is also discussed
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