Dynamical determination of the quadrupole mass moment of a white dwarf

نویسنده

  • Lorenzo Iorio
چکیده

In this letter we dynamically determine the quadrupole mass moment Q of the magnetic white dwarf WD 0137-349 by analyzing the period of the recently discovered brown dwarf moving around it in a close 2-hr orbit. It turns out that a purely Newtonian model for the orbit of WD 0137-349B, assumed circular and equatorial, is adequate, given the present-day accuracy in knowing the orbital parameters of such a binary system. Our result is Q = (−1.4615± 0.9004)× 10 kg m. It is the first dynamical, model-independent measurement of the quadrupole mass moment of a white dwarf.

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تاریخ انتشار 2006