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Pulsating white dwarf stars can be used as astrophysical laboratories toconstrain the properties of weakly interacting particles. Comparing the coolingrates of these stars with the expected values from theoretical models allows usto search for additional sources of cooling due to the emission of axions,neutralinos, or neutrinos with magnetic dipole moment. In this work, we derivean upper bound to the neutrino magnetic dipole moment using an estimate of therate of period change of the pulsating DB white dwarf star PG 1351+489. Bycomparing the theoretical rate of change of period expected for this star withthe rate of change of period with time of PG 1351+489, we assess the possibleexistence of additional cooling by neutrinos with magnetic dipole moment. Ourmodels suggest the existence of some additional cooling in this pulsating DBwhite dwarf, consistent with a non-zero magnetic dipole moment. Our upper limitfor the neutrino magnetic dipole moment is somewhat less restrictive than, butstill compatible with, other limits inferred from the white dwarf luminosityfunction or from the color-magnitude diagram of the Globular cluster M5.Further improvements of the measurement of the rate of period change of thedominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.

Constraining the neutrino magnetic dipole moment from white dwarf pulsations