The magnetic field strength in the emission line region of the AM HER system EF Eridani (=2A0311-277)

Details The magnetic field strength in the emission line region of the AM HER system EF Eridani (=2A0311-277) The magnetic field strength in the emission line region of the AM HER system EF Eridani (=2A0311-277)

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183l...1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. L1, L2. DFG-supported research.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Spectroscopy, Polarization Characteristics, Stellar Magnetic Fields, White Dwarf Stars, X Ray Binaries, Line Spectra, Red Shift, Stellar Oscillations

Scientific paper

If the feature around λ6540 in the circular polarization spectrum of EF Eri (seen only at polarization phase 0.45) is interpreted in terms of a Zeeman split σ--component of Hα emission, at least a significant fraction of the Hα flux originates in a typical magnetic field strength of 1.5±0.3 MG. Assuming a typical polar field strength of 30 MG and a dipolar field structure, this implies a height of the emission region of about 1 - 2 white dwarf radii.

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