Envelope structure of the Mira variable U Orionis

Details Envelope structure of the Mira variable U Orionis Envelope structure of the Mira variable U Orionis

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..339b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 339-349.

Astronomy and Astrophysics

Astrophysics

28

Hydroxyl Emission, Masers, Mira Variables, Radial Velocity, Red Giant Stars, Stellar Envelopes, Angular Distribution, Doppler Effect, Interferometry, Microwave Emission, Optical Pumping, Ring Structures, Velocity Distribution, Very Large Array (Vla)

Scientific paper

The authors have obtained simultaneous VLA measurements of the distributions of 1612 and 1655 MHz OH masers associated with U Orionis. At 1665 MHz they find an incomplete ring distribution near the stellar velocity of -39 km s-1. The observations indicate that radial expansion is the dominant kinematic component at the radius of the OH masers (≡50 AU). From consideration of all available OH, H2O, and SiO data, it is found that a model of axisymmetric, biconical OH density concentrations embedded in a spherical outflow at a constant velocity provides a qualitative basis for understanding the overall properties of the profile structures and the angular distributions.

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