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Measuring the masses of Intermediate Polars with NuSTAR: V709 Cas, NY Lup and V1223 Sgr

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arxiv 1801.08508 v1 pith:O2YARNZJ submitted 2018-01-25 astro-ph.HE

A. W. Shaw , C. O. Heinke , K. Mukai , G. R. Sivakoff , J. A. Tomsick , V. Rana This is my paper · ORCID
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keywords intermediatepolarsmassesnustarodotspectrav1223v709
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abstract

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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  1. Long-term Optical Photometry of V709 Cas Using TESS : Refined Periods and Accretion Geometry

    astro-ph.SR 2025-07 conditional novelty 5.0 of 10

    The white dwarf binary V709 Cas shows refined periods (5.3329 h, 312.7478 s, 317.9267 s) and time-variable accretion geometry consistent with a two-pole disc-overflow accretor.

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