Relations between broad-band linear polarization and CA II H and K emission in late-type dwarf stars

Details Relations between broad-band linear polarization and CA II H and K emission in late-type dwarf stars Relations between broad-band linear polarization and CA II H and K emission in late-type dwarf stars

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..882h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 882-893. Research supported by the Academy of Finlan

Astronomy and Astrophysics

Astrophysics

26

Dwarf Stars, Late Stars, Linear Polarization, Magnetic Stars, Stellar Radiation, Stellar Spectra, Calcium, Potassium, Rossby Regimes, Zeeman Effect

Scientific paper

The authors compare broad-band UBV linear polarization observations of a sample of late-type (F5 - K5) dwarfs with contemporaneous measurements of Ca II H and K line core emission. Various parameters representing the degree of polarization are studied in relation to chromospheric activity. A weighted average of the largest values of the polarization degree appears to be the best parameter for activity diagnostics. The authors suggest stellar magnetic fields and the resulting saturation in the Zeeman-sensitive absorption lines to be the most probable source of linear polarization in late-type main-sequence stars, consistent with the weak trend found with Ca II flux and with inverse Rossby number. The analysis of short term variability in nearly simultaneous polarimetric and Ca-emission observations of ξ Boo A and HD 206860 suggests at least three active areas on both stars.

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