Wavelength dependence of polarization. XXXVI - Changes in polarization across TiO bands in cool stars

Details Wavelength dependence of polarization. XXXVI - Changes in polarization across TiO bands in cool stars Wavelength dependence of polarization. XXXVI - Changes in polarization across TiO bands in cool stars

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1200c&link_type=abstract

Astronomical Journal, vol. 84, Aug. 1979, p. 1200-1210. Research supported by the Conselho Nacional de Desenvolvimento Cientifi

Mathematics

Logic

22

Cool Stars, Linear Polarization, Stellar Temperature, Titanium Oxides, Variable Stars, Wavelengths, Atmospheric Scattering, High Resolution, Polarimeters, Polarization Characteristics, Semiregular Variable Stars, Spectral Resolution, Stellar Envelopes, Stellar Rotation

Scientific paper

Spectropolarimetric observations of the red supergiant Mu Cep and the semiregular variable V CVn are analyzed. Changes in linear polarization are found to occur across the TiO bands in both stars. It is suggested that the polarization in V CVn is probably produced by molecular scattering in a pulsating atmosphere that has systematic pole-to-equator temperature differences appropriate for a star with a rotational velocity of not more than 13 km/s. The results indicate that the polarization in Mu Cep is probably produced in an asymmetric scattering envelope in which the absorbing gas and dust are well mixed and the mean grain size, the scattering geometry, or both, varies with distance from the star. It is concluded that the mean particle radius in the outer part of this envelope is at least 0.15 micron if the grains are enstatite.

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