EUVE J0317-855 A rapidly rotating, high-field magnetic white dwarf

Details EUVE J0317-855 A rapidly rotating, high-field magnetic white dwarf EUVE J0317-855 A rapidly rotating, high-field magnetic white dwarf

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..205f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 205

Astronomy and Astrophysics

Astronomy

48

Magnetic Stars, White Dwarf Stars, Stellar Rotation, Stellar Spectra, Astronomical Photometry, Stellar Magnetic Fields

Scientific paper

Spectropolarimetric observations of the extreme-ultraviolet (EUV) source and high-field magnetic white dwarf EUVE J0317-855 (=RE J0317-853) in the wavelength range 4200-7200 A reveal a strongly structured circular polarization spectrum with a peak polarization of 8 percent. The strongest features in the polarization spectrum are attributed to H-alpha 2s0-3p1, 2s0-3p0, and H-beta 2s0-4f-1, 2s0-4f0, and 2s0-4p1 in a magnetic field of 100-300 MG. The phase-averaged data are modelled using centered and off-centered dipole field structures, and a reasonable fit to the data was obtained for a dipole of strength Bd = 450 MG displaced from the center of the star by 35 percent of the stellar radius and viewed at a mean angle of 30-60 deg to the dipole axis. The wavelength-averaged circular polarization data show variations at a period of 725 +/- 10 s. We also report EUV photometric variations on a period of 725.5 +/- 0.8 s. The EUV light curve is double-peaked, a possible signature of surface abundance inhomogeneities, in contrast with the optical light curve which is single-peaked on the same period. We show that the optical photometric and polarization variations are most likely caused by changes in the surface-averaged field strength and the line-of-sight projected field structure with rotational phase, as would be expected from an oblique rotator model. The high rotation rate, high mass, and age discrepancy with a close DA white dwarf companion (LB 9802) suggest that EUVE J0317-855 may be the outcome of a double-degenerate merger.

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