Abstract
High-resolution spectroscopy of the intermediate polar EX Hydrae
Highlights
We found that the systemic velocity γ = −58.2 ± 1.0 km s−1 quoted by Beuermann & Reinsch (2008) lacked the correction for the observer’s motion relative to barycenter of the solar system
Mending the error is simple, since the velocities for the individual observations on 23 and 26 January 2004 are very close, between +27.57 and +28.12 km s−1, and it suffices to add the weighted mean of 27.9 km s−1 to our radial velocities
The predicted mass-based gravitational redshift of the white dwarf, υgrav = 47.6 ± 3.1 km s−1, stays unchanged, but the predicted systemic velocity of the redshifted ultraviolet and X-ray lines that originate from the surface of the white dwarf, γ + υgrav = +17.3 ± 4.1 km s−1, is in better agreement with the observed value of Belle et al (2003), γ = +9.5 ± 3.0 km s−1 for the narrow component of the far-ultraviolet emission lines and a value of roughly 20 km s−1 for the X-ray emission lines (Mauche, priv. comm.)
Summary
Methods: data analysis – novae, cataclysmic variables – stars: late-type – stars: individual: EX Hya – errata, addenda – stars: fundamental parameters
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