Possible Detection of Weak Magnetic Fields in Two White Dwarfs, Including the Pulsating WD 1647+591

Details Possible Detection of Weak Magnetic Fields in Two White Dwarfs, Including the Pulsating WD 1647+591 Possible Detection of Weak Magnetic Fields in Two White Dwarfs, Including the Pulsating WD 1647+591

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..358..413v&link_type=abstract

Solar Polarization 4, ASP Conference Series, Vol. 358, Proceedings of the conference held 19-23 September, 2005, in Boulder, Col

Physics

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Scientific paper

We present new results of a survey for weak magnetic fields among DA white dwarfs. We have detected variable circular polarization in the Hα line of the pre-white dwarf star WD 1036+433 (DAO/sdO) and suspect the presence of a kG longitudinal magnetic field in the pulsating white dwarfs WD 1647+591. From our data we estimate that the longitudinal magnetic field of WD 1036+433 varies from -1.1 ± 3.2 kG to +9.6 ± 2.6 kG with a period longer than 2 h, with a mean of about +5 kG, and that the field of the pulsating white dwarf WD 1647+591 varies from -0.5 ± 2.8 kG to -8.7 ± 3.2 kG, with a mean of -3.8 ± 1.7 kG. These results, if confirmed by future observations, provide theories of stellar magnetism with important new results.

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