The Radial Velocity and Mass of the White Dwarf of EX Hydrae Measured with Chandra

Abstract

We present the first detection of orbital motion in the cataclysmic variable EX Hydrae based on X-ray data from the Chandra X-ray Observatory. The large collecting area of the telescope and the high resolution of the HETG spectrometers allow for an unprecedented velocity accuracy of ~15 km/s in the X-ray wavelength regime. We find an emission line velocity amplitude of 58.2+-3.7 km/s and infer a white dwarf mass of 0.49+-0.13 M_sun, in good agreement with previous studies using optical, ultraviolet, and far ultraviolet data.

14 pages, 3 figues,accepted for publication by ApJ

References in corpus (5)

• Two Types of X-ray Spectra in Cataclysmic Variables
• A precise HST parallax of the cataclysmic variable EX Hydrae, its system parameters, and accretion rate
• HST/STIS Spectroscopy of the Intermediate Polar EX Hydrae
• A spectroscopic search for faint secondaries in cataclysmic variables
• The Fe XXII I(11.92 A)/I(11.77 A) Density Diagnostic Applied to the Chandra High Energy Transmission Grating Spectrum of EX Hydrae

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• Intermediate polars in the Swift/BAT survey: Spectra and white dwarf masses
• High-resolution spectroscopy of the intermediate polar EX Hydrae. I. Kinematic study and Roche tomography
• Inferring coronal structure from X-ray lightcurves and Doppler shifts: a Chandra study of AB Doradus
• Testing magnetically confined wind shock models for Beta Cep using XMM-Newton and Chandra phase-resolved X-ray observations
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• Herschel Observations of Cataclysmic Variables
• X-ray emission processes in stars
• Spectroscopic Observations of the Intermediate Polar EX Hydrae in Quiescence
• Chandra High Energy Transmission Grating Spectrum of AE Aquarii
• Testing the cooling flow model in the intermediate polar EX Hydrae
• A Coordinated X-ray and Optical Campaign of the Nearby Massive Binary $\delta$ Orionis Aa: II. X-ray Variability
• Simultaneous X-ray and Optical Observations of EX Hydrae
• Chandra High Resolution X-ray Spectroscopy of AM Her
• A Radial Velocity Study of the Intermediate Polar EX Hydrae
• X-ray Light Curves and Accretion Disk Structure of EX Hydrae
• Accretion column structure of magnetic cataclysmic variables from X-ray spectroscopy
• J1832.4-1627, the first eclipsing stream-fed intermediate polar
• Broad Observational Perspectives Achieved by the Accreting White Dwarf Sciences in the XMM-Newton and Chandra Eras
• Current and secular accretion rates of EX Hydrae