Apparent variation in the diameter of Omicron Ceti at 10.2 microns

Details Apparent variation in the diameter of Omicron Ceti at 10.2 microns Apparent variation in the diameter of Omicron Ceti at 10.2 microns

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l.113m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, Aug. 1, 1978, p. L113-L116. NSF-supported research.

Astronomy and Astrophysics

Astronomy

14

Astrometry, Infrared Astronomy, Size Determination, Stellar Envelopes, Variable Stars, Astronomical Photometry, Diameters, Infrared Interferometers, Mira Variables, Optical Thickness, Silicates

Scientific paper

Results are reported for IR spatial interferometry of Omicron Ceti (Mira) performed at wavelengths of 5.0, 8.4, 10.2, 11.1, and 12.5 microns in order to measure the star's angular diameter in the 10-micron 'silicate' feature and to search for effects of time variability resulting from possible periodic mass loss. Broadband photometric data covering the wavelength range from 1.25 to 18 microns are also examined which were obtained at phase 0.92 in the light curve. Observed phase-dependent changes in visibility, 10.2-micron flux density, and IR color indices are discussed, the IR excess in the region from 8.6 to 20 microns is estimated, and the 10-20-micron color temperature is shown to range from 292 to 382 K. The results indicate that the 10.2-micron radiation must be optically thin and must originate from at least two separate components or from a continuous intensity distribution containing a bright 'core' and extended 'wings'. The visibility data obtained with a 1.2-m baseline require that 20% to 30% of the 10.2-micron flux originate from a region with an angular diameter in excess of 1 arcsec.

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