Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983azh....60.1120v&link_type=abstract
(Astronomicheskii Zhurnal, vol. 60, Nov.-Dec. 1983, p. 1120-1127) Soviet Astronomy (ISSN 0038-5301), vol. 27, Nov.-Dec. 1983, p.
Astronomy and Astrophysics
Astronomy
5
Cosmic Dust, Gravitational Effects, Red Giant Stars, Reflection Nebulae, Solar Radiation, Stellar Radiation, Gravitational Constant, Particle Size Distribution, Radiation Pressure, Stellar Atmospheres
Scientific paper
The grain sweeping efficiency beta, defined as the ratio of the radiation-pressure force to the gravitational attractive force, is computed for spherical and cylindrical dust particles composed of graphite, iron, silicates, silicon carbide, or impure ice. Cases are considered in which grains would be swept out by the radiation of carbon and oxygen giants, the sun, or the exciting stars of diffuse and reflection nebulae. The dependence of beta on the grain shape, size, composition, and orientation are discussed. The velocities to which uncharged grains will be accelerated are determined for subsonic and supersonic motion relative to the ambient gas. Also mentioned are the effects of selective grain sweeping upon the particle size distribution, comet-tail profiles, and the measured polarization of nebulae.
Ilin V. B.
Voshchinnikov Nikolai V.
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