A model for the intrinsic linear polarization of cool giant and supergiant stars

Details A model for the intrinsic linear polarization of cool giant and supergiant stars A model for the intrinsic linear polarization of cool giant and supergiant stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..131m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 131-136.

Astronomy and Astrophysics

Astrophysics

2

Cool Stars, Giant Stars, Linear Polarization, Stellar Models, Supergiant Stars, Atomic Spectra, Molecular Spectra, Spectral Bands, Stellar Envelopes, Stellar Magnetic Fields

Scientific paper

A model for the intrinsic linear polarization of cool giant and supergiant stars is developed. The following assumptions are made: (1) the polarization is due to circumstellar super-paramagnetic grains aligned by a stellar magnetic field; (2) grain size and magnetic field geometry vary with distance from the star; (3) variations in the star effective radius with wavelength cause changes in the degree and position angle of the linear polarization. Observations of μ Cep (Coyne and Magalhães, 1979) and σ Cet (McLean and Coyne, 1978) are then used as a test of the model, which reproduces the wide variety of features observed in the continuum and in the molecular bands and atomic lines.

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