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Title:
Multi-wavelength spectrophotometry of EX Hydrae
Authors:
Eisenbart, S.; Beuermann, K.; Reinsch, K.; Gänsicke, B. T.
Affiliation:
AA(Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany), AB(Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany), AC(Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany), AD(Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany)
Publication:
Astronomy and Astrophysics, v.382, p.984-998 (2002) (A&A Homepage)
Publication Date:
02/2002
Origin:
A&A
Astronomy Keywords:
STARS: INDIVIDUAL: EX HYDRAE, CATACLYSMIC VARIABLES, ACCRETION
DOI:
10.1051/0004-6361:20011655
Bibliographic Code:
2002A&A...382..984E

Abstract

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 3 x 1032 erg s-1. The accretion rate of 3 x 1015 g s-1 (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. Based on observations made at the European Southern Observatory, Chile, with the ESO/MPI 2.2-m telescope in MPI time and at the Cerro Tololo Interamerican Observatory, Chile, under ESO programme ID 59.D-0724, and on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
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