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Measuring the masses of magnetic white dwarfs: A NuSTAR Legacy Survey | | A. W. Shaw
; C. O. Heinke
; K. Mukai
; J. A. Tomsick
; V. Doroshenko
; V. F. Suleimanov
; D. J. K. Buisson
; P. Gandhi
; B. W. Grefenstette
; J. Hare
; J. Jiang
; R. M. Ludlam
; V. Rana
; G. R. Sivakoff
; | | Date: |
21 Aug 2020 | | Abstract: | The hard X-ray spectrum of magnetic cataclysmic variables can be modelled to
provide a measurement of white dwarf mass. This method is complementary to
radial velocity measurements, which depend on the (typically rather uncertain)
binary inclination. Here we present results from a Legacy Survey of 19 magnetic
cataclysmic variables with NuSTAR. We fit accretion column models to their
20-78 keV spectra and derive the white dwarf masses, finding a weighted average
$ar{M}_{
m WD}=0.77pm0.02$ $M_{odot}$, with a standard deviation
$sigma=0.10$ $M_{odot}$, when we include the masses derived from previous
NuSTAR observations of seven additional magnetic cataclysmic variables. We find
that the mass distribution of accreting magnetic white dwarfs is consistent
with that of white dwarfs in non-magnetic cataclysmic variables. Both peak at a
higher mass than the distributions of isolated white dwarfs and
post-common-envelope binaries. We speculate as to why this might be the case,
proposing that consequential angular momentum losses may play a role in
accreting magnetic white dwarfs and/or that our knowledge of how the white
dwarf mass changes over accretion-nova cycles may also be incomplete. | | Source: | arXiv, 2008.09684 | | Services: | Forum | Review | PDF | Favorites | |
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