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Paper: White Dwarf Mass Estimation with X-ray Spectroscopy
Volume: 509, 20th European Workshop on White Dwarfs (EuroWD16)
Page: 523
Authors: Hayashi, T.
Abstract: I present X-ray spectral modeling of intermediate polars (IPs) and its application to Suzaku satellite data. The intrinsic thermal X-rays are modeled by integrating the plasma emissions of various temperatures in the post-shock accretion column (PSAC). The physical quantity distributions for the thermal spectral model is calculated from quasi-one-dimensional hydrodynamics. The PSAC calculation includes especially the dipolar geometry and variation of the specific accretion rate. The X-ray reflection from the white dwarf (WD) is modeled by a Monte Carlo simulation. In this simulation, the PSAC irradiates a cool, neutral and spherical WD with the various thermal spectra from the corresponding positions in the PSAC according to the thermal spectral model. The coherent and incoherent scattering, the photoelectric absorption, and Kα and Kβ re-emission of iron and nickel are taken into account for the photons arriving at the WD. The constructed X-ray spectral model is applied to EX Hya and V1223 Sgr, finding 0.65+0.11–0.12 M and 0.91+0.08–0.03 M, respectively. Their specific accretion rates are estimated at 0.069+0.33–0.045 g cm–2 s-1 and > 2 g cm–2 s-1, respectively, while the reflecting angles are 78.0–1.6+1.4 deg and 66.2+2.5–2.3 deg, respectively.
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