Visibility curves at 10 microns wavelength for stars with dust shells

Details Visibility curves at 10 microns wavelength for stars with dust shells Visibility curves at 10 microns wavelength for stars with dust shells

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1237..327d&link_type=abstract

IN: Amplitude and intensity spatial interferometry; Proceedings of the Meeting, Tucson, AZ, Feb. 14-16, 1990 (A91-30676 12-89).

Astronomy and Astrophysics

Astronomy

1

Atmospheric Windows, Cosmic Dust, Infrared Interferometers, Infrared Sources (Astronomy), Infrared Astronomy, Late Stars, Optical Thickness, Wavelengths

Scientific paper

With the Infrared Spatial Interferometer, a two-element heterodyne interferometer operating at Mt. Wilson, California, in the atmospheric window near 10 microns, a total of 19 infrared sources have been observed. Visibility curves of about 5 percent fractional accuracy and a preliminary analysis of the data for the late-type stars Alpha Orionis, IRC + 10216, and O micron Ceti. For IRC + 10216, the data imply that the dust must be closer to the star (not farther than 2.5 stellar radii) and hotter (about 1400 K) than previously thought. Also observed are changes as large as about 60 percent in the visibility of IRC + 10216 with the phase of the stellar pulsation cycle, which imply that, as the star cools, the dust at larger radii cools off and could be as close to the star as about 1.7 stellar radii. The optical depth of the dust at 11 microns must be close to unity. The data for Omicron Ceti show similar behavior implying the presence of dust also at approximately 2.5 stellar radii and as hot as 1770 K, with an optical depth of 0.05. The visibility curve for Alpha Orionis is much simpler and is consistent with the 63 percent of the flux coming from the star, with very little dust inside a radius of 0.8 arcsec.

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