Discovery of optical circular polarization in Lambda Andromedae

Details Discovery of optical circular polarization in Lambda Andromedae Discovery of optical circular polarization in Lambda Andromedae

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317l..29k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 317, June 1, 1987, p. L29-L32. Research supported b

Astronomy and Astrophysics

Astrophysics

13

Cepheid Variables, Circular Polarization, Light Curve, Optical Polarization, Starspots, Binary Stars, Stellar Magnetic Fields

Scientific paper

It is found that the RS CVn-type star has variable broad-band optical circular polarization, of amplitude 0.002-0.004 percent, based on 59 nights' data during 1982, 1985, and 1986. The variability is compared with contemporaneous light curves. Ordered magnetic fields of possibly about 1 kG, in large spots, appear to be present at times. The polarization and light curves were markedly different in different years, owing to evolution of the spot geometry. The patterns switched from predominant variation on the 54 day rotation period to double-peaked curves (period 27 days), but a curious anticorrelation is seen between the variation time scale of the light and polarization. A qualitative model is offered for one case.

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