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 Chandra. 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-1 in the X-ray wavelength regime. We find an emission line velocity amplitude of 58.2+/-3.7 km s-1 and infer a white dwarf mass of 0.49+/-0.13 Msolar, in good agreement with previous studies using optical, ultraviolet, and far-ultraviolet data.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2004
- DOI:
- 10.1086/421389
- arXiv:
- arXiv:astro-ph/0403665
- Bibcode:
- 2004ApJ...610..411H
- Keywords:
-
- Stars: Novae;
- Cataclysmic Variables;
- Stars: Individual: Constellation Name: EX Hydrae;
- Techniques: Spectroscopic;
- X-Rays: Stars;
- Astrophysics
- E-Print:
- 14 pages, 3 figues,accepted for publication by ApJ