The dust shells of NML Cygnus and IRC 10420 - Inner radius, temperature, and optical thickness

Details The dust shells of NML Cygnus and IRC 10420 - Inner radius, temperature, and optical thickness The dust shells of NML Cygnus and IRC 10420 - Inner radius, temperature, and optical thickness

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..662r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 662-674.

Astronomy and Astrophysics

Astronomy

49

Infrared Astronomy, Interferometry, Stellar Envelopes, Astronomical Photometry, Interstellar Extinction, Optical Thickness, Power Spectra, Radii, Spectrum Analysis

Scientific paper

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 μm, 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 μm. 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 μm. 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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