Interferometric observations of Mira (Omicron Ceti)

Details Interferometric observations of Mira (Omicron Ceti) Interferometric observations of Mira (Omicron Ceti)

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259l..19q&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. L19-L22.

Astronomy and Astrophysics

Astrophysics

44

Mira Variables, Stellar Atmospheres, Stellar Spectrophotometry, Brightness Distribution, Michelson Interferometers

Scientific paper

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.

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