The peculiar white dwarf BPM 25114

Astronomy and Astrophysics – Astronomy

Scientific paper

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Light Curve, Stellar Spectrophotometry, Ubv Spectra, White Dwarf Stars, H Beta Line, Line Shape, Optical Polarization, Stellar Magnetic Fields, Zeeman Effect

Scientific paper

Observations of the peculiar white dwarf BPM 25114 are reported. Photometric VBU observations indicate that it is light variable on a time scale near 2.84 days. Spectroscopic observations made both in white light and with a Zeeman analyzer suggest that changes in the profile and polarization of the H-beta line are in phase with the light variations. Simple theoretical calculations suggest that these observed variations are consistent with the oblique rotator model for this star and a dipole magnetic field 4 x 10 to the 7th gauss.

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