Variable polarization and activity in Arcturus

Details Variable polarization and activity in Arcturus Variable polarization and activity in Arcturus

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301l..35k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. L35-L38. Research supported b

Astronomy and Astrophysics

Astrophysics

13

Polarized Electromagnetic Radiation, Stellar Activity, Stellar Radiation, Variable Stars, Calcium, Circular Polarization, Stellar Orbits, Stellar Rotation

Scientific paper

High-sensitivity measurements of the blue light (B) polarization of this bright, nearby star on 65 nights have led to the discovery of intrinsic variable polarization, with amplitude about 0.005 percent. There may be a period or semiperiod of around 45 days, and there is also more rapid variation. Concurrent Ca II H and K line emission data clearly show variability, indicating activity, during the time interval represented. Intensive further observations including photometry are imperative. Three mechanisms for the polarization are considered.

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