Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76.1099b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, Aug. 1991, p. 1099-1125.
Astronomy and Astrophysics
Astrophysics
38
Hydroxyl Emission, Infrared Stars, Interstellar Masers, Kinematic Equations, Mira Variables, Nebulae, Astronomical Models, Line Of Sight, Orion Nebula, Stellar Evolution, Stellar Rotation
Scientific paper
This paper presents kinematical models of ellipsoidal maser shells in order to demonstrate how parameters of the shell geometry influence the observed profile shape and angular distribution. Each model is computed in a three-dimensional grid, and it is shown that, with the exception of a few limiting cases, three-dimensionality is virtually essential to relate complex geometries or velocity fields to the observations. The models are applied to and reasonably describe three complex maser sources: (1) the 1665 MHz OH emission associated with the classical Mira variable U Orionis; (2) the 1667 MHz OH emission associated with the bipolar nebula OH 231.8+4.2; and (3) the low and high velocity outflows ostensibly associated with the luminous star IRc2 in the Orion molecular cloud.
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