Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367l..27b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. L27-L31. Research supported by the Univers
Astronomy and Astrophysics
Astrophysics
50
Astronomical Models, Astronomical Spectroscopy, Cosmic Dust, Interferometry, Omicron Ceti Star, Infrared Spectra, Power Spectra, Stellar Luminosity, Stellar Mass Ejection, Stellar Structure
Scientific paper
Visibilities of Omicron Ceti and Alpha Orionis have been measured at a wavelength of 11 microns by a two-element heterodyne interferometer with maximum baseline spacings of 4 and 13 m. The measurements show that dust extends to within about 3 stellar radii of the oxygen-rich star Omicron Ceti, the temperature there being near 1200 K. While the majority of dust near Alpha Orionis is in a shell of inner radius 0.90 arcsec, where the temperature is about 300 K, a region very near the star producing 11 microns radiation appears to be present. This may be represented as a stellar envelope of diameter 0.063 arcsec which is not transparent at 11 microns wavelengths.
Bester Manfred
Danchi William C.
Degiacomi Cuno G.
Geballe Thomas Ronald
Townes Charles H.
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