Measuring the masses of Intermediate Polars with NuSTAR: V709 Cas, NY Lup and V1223 Sgr
2018
The X-ray spectra of
intermediate polarscan be modelled to give a direct measurement of
white dwarfmass. Here we fit accretion column models to NuSTAR spectra of three
intermediate polars; V709 Cas, NY Lup and V1223 Sgr in order to determine their masses. From fits to 3-78 keV spectra, we find masses of $M_{\rm WD}=0.88^{+0.05}_{-0.04}M_{\odot}$, $1.16^{+0.04}_{-0.02}M_{\odot}$ and $0.75\pm0.02M_{\odot}$ for V709 Cas, NY Lup and V1223 Sgr, respectively. Our measurements are generally in agreement with those determined by previous surveys of
intermediate polars, but with typically a factor $\
sim2$ smaller uncertainties. This work paves the way for an approved NuSTAR Legacy Survey of
white dwarfmasses in
intermediate polars.
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