Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sva....21..715d&link_type=abstract
(Astronomicheskii Zhurnal, vol. 54, Nov.-Dec. 1977, p. 1259-1267.) Soviet Astronomy, vol. 21, Nov.-Dec. 1977, p. 715-719. Trans
Astronomy and Astrophysics
Astronomy
1
Giant Stars, Infrared Stars, Optical Polarization, Stellar Envelopes, Stellar Radiation, Infrared Astronomy, Light Emission, Linear Polarization, M Stars, Stellar Magnetic Fields
Scientific paper
Physical conditions in the gas-dust shells of M giants with an IR excess are examined. It is shown that the outflow of gas and dust occurs with a constant relative velocity, that the dust density is 0.1% to 1% of the gas density, and that the dust density varies as the inverse square of radial distance. Calculations are performed which indicate that dust grains near the star may be oriented via paramagnetic relaxation if the stellar magnetic field is much greater than 100 G and that grain orientation will result from the relative motion of gas and dust in the case of a weak magnetic field (but greater than 1 G) or in more distant parts of the circumstellar shell. It is concluded that the second mechanism is sufficient to explain the observed linear polarization of radiation from the stars considered.
Dolginov Arkady Z.
Mitrofanov Igor G.
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