Simultaneous X-Ray and Optical Observations of EX Hydrae*

K. E. Belle; S. B. Howell; K. Mukai; P. Szkody; K. Nishikida; D. R. Ciardi; R. E. Fried; J. P. Oliver

doi:10.1086/428487

Simultaneous X-Ray and Optical Observations of EX Hydrae^*

K. E. Belle¹, S. B. Howell², K. Mukai^3,4, P. Szkody⁵, K. Nishikida⁶, D. R. Ciardi⁷, R. E. Fried⁸, and J. P. Oliver⁹

© 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astronomical Journal, Volume 129, Number 4 Citation K. E. Belle et al 2005 AJ 129 1985 DOI 10.1086/428487

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Author affiliations

¹ X-2 MS B227, Los Alamos National Laboratory, Los Alamos, NM 87545

² WIYN Observatory and National Optical Astronomy Observatory, P.O. Box 26732, 950 North Cherry Avenue, Tucson, AZ 85726-6732

³ Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771

⁴ Also Universities Space Research Association

⁵ Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195

⁶ Space Sciences Lab, University of California, Berkeley, Berkeley, CA 94720

⁷ Michelson Science Center, California Institute of Technology, 770 South Wilson Avenue, Mail Code 100-22, Pasadena, CA 91125

⁸ Braeside Observatory, P.O. Box 906, Flagstaff, AZ 86002-0906

⁹ Department of Astronomy, University of Florida, P.O. Box 112055, Gainesville, FL 32611

Dates

Received 2004 October 15
Accepted 2004 December 27

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Abstract

The intermediate polar, EX Hydrae, was the object of a large simultaneous multiwavelength observational campaign during 2000 May–June. Here we present the Rossi X-Ray Timing Explorer photometry and optical photometry and spectroscopy from ground-based observatories obtained as part of this campaign. Balmer line radial velocities and Doppler maps provide evidence for an extended bulge along the outer edge of the accretion disk and some form of extended/overflowing material originating from the hot spot. In addition, the optical binary eclipse possesses an extended egress shoulder, an indication that an additional source (other than the white dwarf) is coming out of eclipse. We also compare the X-ray and optical results with the results obtained from the EUV and UV observations from the multiwavelength data set.

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Footnotes

*
Based in part on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium.

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