Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l..27m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Jan. 1, 1980, p. L27-L31. NSF-supported research.
Astronomy and Astrophysics
Astronomy
57
Infrared Astronomy, Infrared Interferometers, Late Stars, Stellar Spectra, Variable Stars, Carbon Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Models, Symmetry
Scientific paper
Spatial spectra of IRC +10216 have been measured in two dimensions at eight wavelengths from 2.2 to 20 microns. Considerable departures from spherical symmetry exist at 2.2, 3.5, and 5.0 microns at frequencies greater than 1.0 cycles/arcsec. Over this wavelength range, angular diameter appears to change by a factor about 2.5 in an east-west direction, but is roughly constant north-south. Results are inconsistent with single-component circumstellar models having an r to the -2nd density gradient. Fringe visibility at 5.0 microns varies not greater than 30% between maximum and minimum phase. Photometric measurements show the recent minimum to be the faintest yet observed.
Howell Robert R.
Low Frank J.
McCarthy Donald W.
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