Constraints on astronomical silicate dust
Journal Article
·
· Astrophysical Journal; (USA)
- Missouri-Saint Louis Univ., Saint Louis (USA)
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. 18 refs.
- OSTI ID:
- 6151083
- Journal Information:
- Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 361; ISSN ASJOA; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
CARBON
COSMIC DUST
DUSTS
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
INFRARED SPECTRA
INTERSTELLAR GRAINS
INTERSTELLAR SPACE
MATHEMATICAL MODELS
MINERALS
NONMETALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
PROTOSTARS
RADIATION TRANSPORT
SILICATES
SILICON COMPOUNDS
SPACE
SPECTRA
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
CARBON
COSMIC DUST
DUSTS
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
INFRARED SPECTRA
INTERSTELLAR GRAINS
INTERSTELLAR SPACE
MATHEMATICAL MODELS
MINERALS
NONMETALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
PROTOSTARS
RADIATION TRANSPORT
SILICATES
SILICON COMPOUNDS
SPACE
SPECTRA
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA