Constraints on astronomical silicate dust

Details Constraints on astronomical silicate dust Constraints on astronomical silicate dust

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..150s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 150-154.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Models, Interstellar Matter, Pre-Main Sequence Stars, Silicates, Stellar Envelopes, Graphite, Infrared Spectra, Optical Properties, Radiative Transfer, Ultraviolet Spectra, Visible Spectrum

Scientific paper

Numerical radiative-transfer models are used to discuss the properties of circumstellar dust grains around the premain-sequence star AB Aur (HD 31293). It is assumed that the dust consists of a silicate-graphite mixture with Draine and Lee (1984) optical properties. The modeling technique is to match the observed FUV through FIR energy distribution with the spectral energy distribution predicted for a spherical dust shell around a luminous hot star. Special attention is given to matching the observed 10-micron silicate emission feature and the observed circumstellar absorption curve at UV wavelengths, making it possible to strengthen constraints on dust-grain opacity and chemical composition. It is concluded that, although silicate grains can explain the observed 10-micron emission feature, the Draine and Lee silicate-graphite mixture cannot explain the observed FUV circumstellar absorption at the same time. The dust shell around AB Aur contains an additional population of small particles, the most likely candidate being amorphous carbon grains in a nonhydrogenated form.

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