Discovery of broad-band optical circular polarization in Alpha Leonis

Details Discovery of broad-band optical circular polarization in Alpha Leonis Discovery of broad-band optical circular polarization in Alpha Leonis

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340l..65h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 340, May 15, 1989, p. L65-L68.

Astronomy and Astrophysics

Astrophysics

Circular Polarization, Magnetic Stars, Main Sequence Stars, Optical Polarization, Visible Spectrum, Spectral Line Width, Stellar Magnetic Fields, Stellar Rotation, Variable Stars

Scientific paper

Variable broad-band optical circular polarization of amplitude 0.001 percent in the rapidly rotating, upper main-sequence star Alpha Leo. The variability does not appear to correlate with the suggested range of the rotation period of the star (11-22 hr), but it does occur on short time scales. When compared to observations of the known magnetic star Alpha exp 2 CVn, the magnitude of the observed circular polarization indicates an effective magnetic field on the order of 1 kG is present. The circular polarization exhibits sign reversals which suggest a dipolar geometry to the field, a characteristic of the fields of magnetic Ap stars.

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