Multi-wavelength spectrophotometry of EX Hydrae

Details Multi-wavelength spectrophotometry of EX Hydrae Multi-wavelength spectrophotometry of EX Hydrae

2001-11-23

arxiv.org/abs/astro-ph/0111459v1

Astron.Astrophys. 382 (2002) 984

Astronomy and Astrophysics

Astrophysics

15 A&A Latex, 9 Figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20011655

We present phase-resolved infrared and optical spectrophotometry of the intermediate polar EX Hya supplemented by archival ultraviolet data. The spin-modulated emission from the accretion funnel and the emission from the accretion disk or ring contain substantial optically thin components. The white dwarf dominates the unmodulated flux in the ultraviolet and is identified by numerous absorption lines. Metal absorption in the accretion curtain may add to the observed spectral features. The secondary star is of spectral type M4+-1 and is detected by its ellipsoidal modulation. We derive a distance of 65+-11 pc which makes EX Hydrae one of the closest cataclysmic variables with a known distance. The luminosity derived from the integrated overall spectral energy distribution is 3x10^32 erg/s. The accretion rate of 3x10^15 g/s (for an 0.6 Msun white dwarf) is in reasonable agreement with the rates expected from angular momentum loss by gravitational radiation and from the observed spin-up of the white dwarf

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