The opacity of the dust around the carbon star IRC + 10216

Details The opacity of the dust around the carbon star IRC + 10216 The opacity of the dust around the carbon star IRC + 10216

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176..107l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 1, April 1987, p. 107-113.

Astronomy and Astrophysics

Astronomy

49

Carbon Stars, Cosmic Dust, Opacity, Stellar Envelopes, Broadband, Infrared Astronomy, Optical Thickness, Radiative Transfer, Stellar Spectrophotometry

Scientific paper

Photometric data, between 0.5 and 20 μm, obtained on IRC +10216 at its 1985 maximum, are presented. These data are combined to longer wavelength measurements made near previous maxima to derive a typical energy distribution between 0.5 and 1000 μm. This broad-band spectrum is interpreted in terms of a radiative-transfer model, consisting of a central star surrounded by a circumstellar dust shell. It is found that a dust opacity law in λ-1.3 is adequate to reproduce the general characteristics of the spectrum. Such a modelling is also coherent with infrared spatial results. The optical depth at 1 μm is estimated to be 9 - 10, and the temperature of the hottest grains, 900 - 1000K.

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