The weak magnetic field of the AP star Epsilon Ursae Majoris

Details The weak magnetic field of the AP star Epsilon Ursae Majoris The weak magnetic field of the AP star Epsilon Ursae Majoris

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358l..25b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 358, July 20, 1990, p. L25-L28. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

25

A Stars, Magnetic Stars, Peculiar Stars, Stellar Magnetic Fields, Circular Polarization, H Beta Line, Magnetic Field Configurations, Magnetic Flux, Stellar Rotation, Stellar Spectra

Scientific paper

High-SNR circular polarization measurements in the wings of H-beta have been obtained for the bright A0pCr star Epsilon UMa, throughout its 5.0887-d rotation period. These data suggest that Epsilon UMa possesses an approximately dipolar magnetic field with magnetic extrema of +128 and -64 G. If the inclination of the rotation axis of the star is in the range i = 65 + or - 15 deg, then the obliquity of the magnetic field axis to the rotation axis is between 19 and 84 deg. The observations are compared with recent Doppler imaging studies of the surface abundances of Epsilon UMa.

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