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Composite interstellar grains
Abstract
The possibility that interstellar grains are composite collections of very small particles, loosely attached to one another, is investigated. The grains are assumed to include a substantial proportion of vacuum along with solid particles. The optical properties of the composite grains are calculated with the approximate 'Bruggeman mixing rule', and the extinction of the grain is calculated wih standard Mie theory. The derived cross sections are close to those of hollow spheres in which the constituents occupy the proper volume fractions, and the derived optical constants of the mixture also obey the Kramers-Kroenig relations. The calculated interstellar extinction law shows reasonable agreement with observations of the diffuse ISM over the 1500-0.12 micron wavelength range. The predicted albedo is 0.5-0.6. It is predicted that the visual extinction per H nucleus should increase slightly with R(V).
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Citations
Cited by
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
Draine, B. T., & Li, A. (2007) · The Astrophysical Journal · doi:10.1086/511055 · Cited by 2,122
The Dust Opacity of Star‐forming Galaxies
Calzetti, D. (2001) · Publications of the Astronomical Society of the Pacific · doi:10.1086/324269 · Cited by 829
The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
Jones, A. P., Fanciullo, L., Köhler, M., Verstraete, L., Guillet, V., Bocchio, M., & Ysard, N. (2013) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201321686 · Cited by 444
Dunne, L., & Eales, S. A. (2001) · Monthly Notices of the Royal Astronomical Society · doi:10.1046/j.1365-8711.2001.04789.x · Cited by 356
Metadata
- Authors
- Mathis, J. S., & Whiffen, G.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1989-06
- Volume
- 341
- Pages
- 808
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1971177177
- Cited by
- 326
- References
- 0
- FWCI
- 8.92
- Type
- journal article
- Language
- en
- Open access
- closed
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