X-ray spectroscopy method of white dwarf mass determination in intermediate polars. External systematic uncertainties
arXiv:2506.03711 · doi:10.1051/0004-6361/202554368
Abstract
The masses of white dwarfs (WDs) in intermediate polars (IPs) can be determined from the shape of their hard X-ray spectra. Here we study the importance of all possible systematic uncertainties in this X-ray spectroscopy method, including finite radii and rotation of magnetospheres, finite accretion column height and accretion-flow inclination relative to the WD surface. We also investigate the importance of accretion-heated envelopes on WD surfaces in IPs which are increasing WD radii. Their presence changes the commonly used mass-radius relation for cold white dwarfs. As a first approximation we use thick () hydrogen envelope models with a surface temperature of 30 kK. We present a new model grid of hard X-ray spectra of high-luminous IPs computed among other things with using a new mass-radius relation. This grid is used for fitting Swift/BAT spectra of 47 IPs. The average WD mass in this sample is 0.82 and coincides with the average WD mass in cataclysmic variables obtained by optical methods. This means that the calculated hard X-ray spectra and the assumptions made that the magnetospheric radii in IPs are close to the corotation radii, and the relative heights of the accretion columns are small are basically correct, because most IPs have high luminosities. But this universal grid (as well as previous universal grids) cannot give correct results for the low-luminous IPs with probably relatively tall accretion columns on the WD surfaces. Such IPs have to be investigated with individual accretion column models.
14 pages, 14 figures, submitted to A&A, after the second referee report
References in corpus (39)
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
- The 105 month Swift-BAT all-sky hard X-ray survey
- White Dwarf Mass Distribution in the SDSS
- X-ray Emissions from Accreting White Dwarfs: a Review
- Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
- Cataclysmic Variable Primary Effective Temperatures: Constraints on Binary Angular Momentum Loss
- Three in one go: consequential angular momentum loss can solve major problems of CV evolution
- Testing the white dwarf mass-radius relationship with eclipsing binaries
- RXTE broadband X-ray spectra of intermediate polars and white dwarf mass estimates
- X-ray emission from classical and recurrent-novae observed with ROSAT
- MESA Models of Classical Nova Outbursts: The Multicycle Evolution and Effects of Convective Boundary Mixing
- White dwarf masses in intermediate polars observed with the Suzaku satellite
- Quenching of the accretion disk strong aperiodic variability at the magnetospheric boundary
- Hard X-ray view on intermediate polars in the Gaia era
- Determining the mass of the accreting white dwarf in magnetic CVs using data
- NLTE model atmospheres for the hottest white dwarfs: Spectral analysis of the compact component in nova V4743 Sgr
- Intermediate polars in the Swift/BAT survey: Spectra and white dwarf masses
- The size of the accretion region in intermediate polars: eclipses of XY Arietis observed with RXTE
- Hard X-ray Cataclysmic Variables
- Measuring the masses of magnetic white dwarfs: A NuSTAR Legacy Survey
- GK Per and EX Hya: Intermediate polars with small magnetospheres
- High-resolution spectroscopy of the intermediate polar EX Hydrae. I. Kinematic study and Roche tomography
- Aperiodic optical variability of intermediate polars - cataclysmic variables with truncated accretion disks
- Discovery of a Second Nova Eruption of V2487 Ophiuchi
- Cataclysmic variable evolution and the white dwarf mass problem: A Review
- On the nature of the hard X-ray sources SWIFTJ1907.3-2050, IGRJ12123-5802 and IGRJ19552+0044
- Accretion in dipole magnetic fields: flow structure and X-ray emission of accreting white dwarfs
- Broadband aperiodic variability in X-ray pulsars: accretion rate fluctuations propagating under the influence of viscous diffusion
- INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
- The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study
- Hard X-ray luminosity functions of cataclysmic variables: Joint Swift/BAT and Gaia data
- RXTE and XMM observations of intermediate polar candidates
- On the area of accretion curtains from fast aperiodic time variability of the intermediate polar EX Hya
- Centrifugal barriers in magnetospheric accretion
- A Radial Velocity Study of the Intermediate Polar EX Hydrae
- An Estimation of the White Dwarf Mass in the Dwarf Nova GK Persei with NuSTAR Observations of Two States
- Dynamical mass of the white dwarf in XY Ari: a test for intermediate polar X-ray spectral models
- Soft X-ray emission from the classical nova AT 2018bej