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Interferometric observations of Mira (Omicron Ceti)The long-period variable Mira Omicron Ceti has been observed at 800 nm wavelength with the Mk III Optical Interferometer at photometric phases 0 = 0.96, 0.05, and 0.14 in 1990; some additional data were taken in 1989. The star is not spherically symmetric, and temporal variations of the size and the position angle of the asymmetry are detected. The visibility data can be represented by two uniform elliptical disks, which could correspond to different layers in Mira's atmosphere. If the size variations are interpreted in terms of physical motion of the emitting material, an infall velocity of about 15 km/s around phi = 0 is derived.
Document ID
19930059212
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Quirrenbach, A.
(U.S. Naval Observatory; Universities Space Research Association, Washington, United States)
Mozurkewich, D.
(U.S. Naval Observatory; U.S. Navy Center for Advanced Space Sensing, Washington, United States)
Armstrong, J. T.
(U.S. Naval Observatory; Universities Space Research Association, Washington, United States)
Johnston, K. J.
(U.S. Navy Center for Advanced Space Sensing, Washington, United States)
Colavita, M. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shao, M.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Astronomy and Astrophysics
Volume: 259
Issue: 1
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
93A43209
Distribution Limits
Public
Copyright
Other

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