A dipole model for magnetic white dwarf BPM 25114

Details A dipole model for magnetic white dwarf BPM 25114 A dipole model for magnetic white dwarf BPM 25114

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..533m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 183, May 1978, p. 533-538.

Astronomy and Astrophysics

Astronomy

20

Magnetic Dipoles, Magnetic Stars, Stellar Models, Stellar Spectra, White Dwarf Stars, H Alpha Line, Polarization Characteristics, Stellar Rotation, Wavelengths, Zeeman Effect

Scientific paper

Theoretical spectra have been computed for the magnetic DA white dwarf BPM 25114 assuming a centered-dipole field distribution. The polar field strength is deduced to be about 36 million G. The observations suggest that the angle between the line of sight and the magnetic axis varies by perhaps 30 deg during a rotation period. Detailed comparison with H-alpha observations indicate more broadening than is predicted by the centered-dipole model. Strong variable wavelength-dependent circular (maximum about 8%) and linear (maximum about 4%) polarization are predicted for this star.

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