Broad-band linear polarization in cool stars. II - Amplitude and wavelength dependence for magnetic and scattering regions

Details Broad-band linear polarization in cool stars. II - Amplitude and wavelength dependence for magnetic and scattering regions Broad-band linear polarization in cool stars. II - Amplitude and wavelength dependence for magnetic and scattering regions

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..739s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 739-750.

Astronomy and Astrophysics

Astrophysics

14

Cool Stars, Linear Polarization, Stellar Magnetic Fields, Stellar Models, Amplitudes, Rayleigh Scattering, Thomson Scattering, Wavelengths

Scientific paper

We have developed a model to estimate the amplitude and wavelength dependence of broad-band linear polarization (BLP) from magnetic regions on cool stars. The model includes corrections both for line blends and for the partial cancellation of polarization in the vector sum over the stellar disk. Our results agree with recent calculations of BLP in the red, but show larger amplitudes and a different wavelength dependence in the blue. We find that the detailed wavelength dependence of the polarization is complex and varies with effective temperature and gravity due to changes in line blanketing. The BLP amplitudes depend strongly on field strength, blanketing, and magnetic region filling factor and geometry. We make rough estimates of the maximum BLP for stars of various spectral types and demonstrate a method for deriving a lower limit to the filling factor from the maximum observed BLP. This lower limit is related to the fractional area covered by the spatially asymmetric component of magnetic regions.

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