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Paper: Possible Detection of Weak Magnetic Fields in Two White Dwarfs, Including the Pulsating WD1647+591
Volume: 358, Solar Polarization 4
Page: 413
Authors: Valyavin, G.; Bagnulo, S.; Fabrika, S.; Han, I.; Monin, D.; Reisenegger, A.; Wade, G.A.
Abstract: 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 WD1036+433 (DAO/sdO) and suspect the presence of a kG longitudinal magnetic field in the pulsating white dwarfs WD1647+591. From our data we estimate that the longitudinal magnetic field of WD1036+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 WD1647+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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