Other
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...307..261d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 307, Aug. 1, 1986, p. 261-268.
Other
12
Polarized Light, Stellar Envelopes, Stellar Radiation, Supergiant Stars, Atmospheric Temperature, Continuous Radiation, Cosmic Dust, Photosphere, Rayleigh Scattering
Scientific paper
Much of the complex behavior of the polarization observed in the M2 supergiant Alpha Ori can be explained in terms of the combined effects of Rayleigh scattering in the photosphere and scattering by circumstellar dust in the presence of one or more photospheric hot spots. The ad hoc scattering layer of electrons which Schwarz and Clarke employed in their models reported in 1984 can be avoided, eliminating the conflict with the much lower column densities found in other studies of the extended chromosphere of this star. The transfer of polarized continuum radiation in cool model atmospheres has been treated fully. Under conditions of optimal spot area and location on the disk and large temperature differences (up to 1000 K) between the spot and normal photosphere, it is possible to get a net polarization up to about 0.3 percent in the blue in the direct starlight. The effects of spot limb darkening on the polarization of scattered spot light have been evaluated. Narrow-band observations that include molecular bands are encouraged for their diagnostic value.
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