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Title:
The dust shells of NML Cygnus and IRC 10420 - Inner radius, temperature, and optical thickness [ Erratum: 1987ApJ...312..963R ]
Authors:
Ridgway, S. T.; Joyce, R. R.; Connors, D.; Pipher, J. L.; Dainty, C.
Affiliation:
AA(Kitt Peak National Observatory, Tucson, AZ), AB(Kitt Peak National Observatory, Tucson, AZ), AC(Kitt Peak National Observatory, Tucson, AZ), AD(Rochester, University, NY), AE(Rochester, University, NY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 662-674. (ApJ Homepage)
Publication Date:
03/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INFRARED ASTRONOMY, INTERFEROMETRY, STELLAR ENVELOPES, ASTRONOMICAL PHOTOMETRY, INTERSTELLAR EXTINCTION, OPTICAL THICKNESS, POWER SPECTRA, RADII, SPECTRUM ANALYSIS
DOI:
10.1086/164027
Bibliographic Code:
1986ApJ...302..662R

Abstract

Infrared speckle interferometric observations of NML Cygnus and IRC 10420 at K, L, and M have been analyzed with a simple numerical model of the shells. The analysis yields the extinction function and the monochromatic optical depth of the shells for the wavelengths 2-5 mum, the temperature at the inner boundary, and the inner boundary radius. The optical depth of the NML Cyg shell is 2.4 ± 0.4 at 3.4 mum. The inner boundary of the dust shell is at a radius of 0."045 ± 0."012, and the dust there is at a temperature > 1200 K. The corresponding parameters for IRC 10420 are 0.7 ± 0.3, O."125 ± 0."015, 750 ± 50 K. Both stars apparently have a very extended (1") shell which contributes ˜10% of the flux at 2.2 mum. This is likely to be a scattering shell, and it suggests continued grain growth during expansion. Appendices describe the speckle interferometer and the numerical modeling technique.

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