Polarimetric observations of solar-type stars

Details Polarimetric observations of solar-type stars Polarimetric observations of solar-type stars

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..357h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 2, Nov. 1985, p. 357-360. Research supported by the Academy of Finlan

Astronomy and Astrophysics

Astrophysics

20

Late Stars, Linear Polarization, Polarimetry, Stellar Activity, Stellar Radiation, Ubv Spectra, Abundance, Magnetic Effects, Polarized Electromagnetic Radiation, Stellar Magnetic Fields, Time Dependence, Wavelengths

Scientific paper

Five-colour (UBVRI) polarimetric observations of 13 late-type stars are reported. Three stars (HD 20630, HD 25998 and HD 206860) showed a clear wavelength dependent polarization, decreasing from the ultraviolet to the red channel, and for several others the polarization is large in the ultraviolet. Time dependent variations are also observed, and some stars show variations in the U and B bands not correlated with those in the R and I bands. These results suggest that the observed linear polarization in U and B is at least partly intrinsic and caused by magnetic activity in these stars. A slight increase in the degree of polarization in U and B with increasing chromospheric Ca II (H+K)-emission flux supports this conclusion.

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