Observations on the variability of linear polarization in late-type dwarf stars

Details Observations on the variability of linear polarization in late-type dwarf stars Observations on the variability of linear polarization in late-type dwarf stars

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...78..129h&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 78, no. 1, April 1989, p. 129-139. Research supported by Aal

Astronomy and Astrophysics

Astrophysics

14

Dwarf Stars, Late Stars, Linear Polarization, Stellar Magnetic Fields, Rayleigh Scattering, Stellar Atmospheres, Thomson Scattering, Zeeman Effect

Scientific paper

Broadband (UBV) linear polarimetric observations of a sample of late-type (F7-K5) dwarfs are reported. The observations include ten stars and extend over a maximum of 20 nights. Seven stars show significant temporal variability of polarization, which could be interpreted as rotational modulation due to slowly varying magnetic regions. Magnetic intensification in saturated Zeeman sensitive absorption lines is suggested as the dominant effect connecting linear polarization with magnetic activity in the most active single late-type dwarfs, while the wavelength dependence in the less active stars could also be due to a combination of Rayleigh and Thomson scattering.

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