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Title: Measuring the masses of intermediate polars with NuSTAR: V709 Cas, NYLup, and V1223 Sgr
Authors: Shaw, A. W.
Heinke, C. O.
Rana, V
+3 Co-Authors
Keywords: accretion
accretion discs
cataclysmic variables
white dwarfs
X-rays: binaries
Issue Date: 1-May-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2018, Vol.476, p554–561
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_WD=0.88^{+0.05}_{-0.04} M_{☉}, 1.16^{+0.04}_{-0.02} M_{☉}, and 0.75 ± 0.02 M☉ 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 ̃2 smaller uncertainties. This work paves the way for an approved NuSTAR Legacy Survey of white dwarf masses in intermediate polars.
Description: Open Access
ISSN: 0035-8711
1365-2966 (online)
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Copyright: 2018 The Author(s)
Appears in Collections:Research Papers (A&A)

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