Dust shell modelling of the carbon star IRAS 15194 - 5115

Details Dust shell modelling of the carbon star IRAS 15194 - 5115 Dust shell modelling of the carbon star IRAS 15194 - 5115

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..462l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 462-467.

Astronomy and Astrophysics

Astronomy

13

Carbon Stars, Cosmic Dust, Infrared Astronomy Satellite, Stellar Envelopes, Stellar Models, Radiative Transfer, Stellar Atmospheres

Scientific paper

First high spatial resolution observations of the carbon star IRAS 15194 - 51l5 are presented. Visibility curves are obtained in K (2.2-microns) and L (3.6-microns) spectral bands. They mainly sample the dust shell component of the source. These measurements are combined with photometric and spectroscopic data resulting both from ground-based and from the IRAS observations. A spherical dust shell modeling based on numerical simulation is proposed. The optical depth at lambda = 1 micron is estimated to be 8 and the inner boundary of the envelope to be at about 6 stellar radii. A temperature profile for amorphous carbon dust is displayed. The temperature of the hottest grains is about 900 K. The importance of long baseline interferometry observations is emphasized.

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