用NuSTAR测量中间极的质量：V709 Cas、NY Lup和V1223 Sgr
Measuring the masses of Intermediate Polars with NuSTAR: V709 Cas, NY Lup and V1223 Sgr
摘要：
中间极的X射线光谱可以被模拟以直接测量白矮星的质量。在这里，我们适合吸积柱模型NuSTAR光谱的三个中间极; V709 Cas，NY Lup和V1223 Sgr，以确定其质量。从3-78 keV光谱的拟合，我们分别发现V709 Cas、NY Lup和V1223 Sgr的$M_{\rm WD}=0.88^{+0.05}_{-0.04}M_{\odot}$、$1.16^{+0.04}_{-0.02}M_{\odot}$和$0.75\pm0.02M_{\odot}$的质量。我们的测量结果一般与以前的调查中确定的中间极性，但通常有一个因素$\sim2$较小的不确定性。这项工作为获得批准的NuSTAR遗产调查中间极中的白矮星质量铺平了道路。
英文摘要：
The X-ray spectra of intermediate polars can be modelled to give a direct measurement of white dwarf mass. 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 dwarf masses in intermediate polars.
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