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

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

2004-03-29

arxiv.org/abs/astro-ph/0403665v1

Astrophys.J. 610 (2004) 411-415

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figues,accepted for publication by ApJ

Scientific paper

10.1086/421389

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.

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