Theoretical studies of the infrared emission from circumstellar dust shells - The infrared characteristics of circumstellar silicates and the mass-loss rate of oxygen-rich late-type giants

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167711· OSTI ID:5595521

Schutte, W A; Tielens, A G.G.M. ^[1]

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1. NASA, Ames Research Center, Moffett Field, CA (USA)

A simple analytic formula and a numerical radiative transfer program have been used to model the IR emission of spherically symmetric circumstellar dust shells in order to determine the IR absorption properties of circumstellar silicate grains and the mass-loss rates of the central stars. The correlation between the near-IR color temperature and the strength of the 10-micron emission or absorption feature is discussed, and it is shown that the near-IR absorption efficiency of circumstellar silicate grains is much higher than is expected from terrestrial minerals, possibly due to the presence of Fe(2+) color centers dissolved in the circumstellar silicates. Detailed models of the IR emission of R Cas, IRC 10011, and OH 26.5+0.6 are presented. 126 refs.

• OSTI ID: 5595521
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 343; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ANALYTICAL SOLUTION
COSMIC DUST
DENSITY
DUSTS
ELECTROMAGNETIC RADIATION
GIANT STARS
INFRARED RADIATION
INFRARED SPECTRA
MASS TRANSFER
MATHEMATICAL MODELS
NEAR INFRARED RADIATION
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
RADIATIONS
SILICATES
SILICON COMPOUNDS
SPECTRA
STARS