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Measuring the masses of intermediate polars with NuSTAR: V709 Cas, NY Lup, and V1223 Sgr

  • Author(s) / Creator(s)
  • 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 MWD=0.88+0.05−0.04M⊙, 1.16+0.04−0.02M⊙, 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.

  • Date created
    2018-01-01
  • Subjects / Keywords
  • Type of Item
    Article (Published)
  • DOI
    https://doi.org/10.7939/r3-9g91-p792
  • License
    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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  • Citation for previous publication
    • Shaw, A. W., Heinke, Craig O., Mukai, K., Sivakoff, Gregory Robert., Tomsick, John A., & Rana, Vikram. (2018). Measuring the masses of intermediate polars with NuSTAR: V709 Cas, NY Lup, and V1223 Sgr. Monthly Notices of the Royal Astronomical Society, 476(1), 554-561. https://doi.org/10.1093/mnras/sty246
  • Link to related item
    https://doi.org/10.1093/mnras/sty246