EUVE Spectroscopy of Polars

An admittedly pedantic but hopefully useful and informative analysis is presented of the EUVE 70--180 Angstrom spectra of nine polars. These spectra are fit with three different models---a blackbody, a pure-H stellar atmosphere, and a solar abundance stellar atmosphere---to reveal the presence of spectral features such as absorption lines and edges, and to investigate the sensitivity of the derived (kT, N_H, solid angle) and inferred (fractional emitting area, bolometric luminosity) parameters to the model assumptions. Among the models tested, the blackbody model best describes the observed spectra, although the untested irradiated solar abundance stellar atmosphere model is likely a better overall description of the EUV/soft X-ray spectra of polars.Comment: 12 pages, 6 Postscript figures; LaTeX format, uses paspconf.sty, epsf.sty, and psfig.sty. To appear in the Proceedings of the Annapolis Workshop on Magnetic Cataclysmic Variables, ed. C. Hellier and K. Mukai (San Francisco: ASP

EUVE Observations of VW Hydri in Superoutburst

EUVE observed the SU UMa-type dwarf nova VW Hydri in superoutburst for an interval of nearly 2 days in 1994 June and produced EUV light curves and the first EUV spectrum of this important CV.Comment: 4 pages including 2 encapsulated postscript figures; LaTeX format, uses kluwer.cls; another old paper, brought kicking and screaming into the digital ag

The Quasi-Coherent Oscillations of SS Cygni

Properties of the quasi-coherent oscillations in the extreme ultraviolet (EUV) flux of the dwarf nova SS Cygni are described, with emphasis on (1) the scaling between the period of the oscillation and the EUV flux and (2) the mean power spectra and waveforms. In addition, a quasi-coherent oscillation at \nu = 0.012 +/- 0.002 Hz (FWZI) is discovered and proposed to be the spin frequency of the white dwarf.Comment: LaTeX format, uses paspconf.sty, 4 pages, 2 Postscript figures, Submitted for inclusion in Proceedings of IAU Colloquium No. 163 --- Accretion Phenomena & Related Outflows, ed. D. Wickramasinghe, L. Ferrario, & G. Bicknell (San Francisco: ASP

Optical, UV, and EUV Oscillations of SS Cygni in Outburst

I provide a review of observations in the optical, UV (HST), and EUV (EUVE and Chandra LETG) of the rapid periodic oscillations of nonmagnetic, disk-accreting, high mass-accretion rate cataclysmic variables (CVs), with particular emphasis on the dwarf nova SS Cyg in outburst. In addition, I drawn attention to a correlation, valid over nearly six orders of magnitude in frequency, between the frequencies of the quasi-periodic oscillations (QPOs) of white dwarf, neutron star, and black hole binaries. This correlation identifies the high frequency quasi-coherent oscillations (so-called ``dwarf nova oscillations'') of CVs with the kilohertz QPOs of low mass X-ray binaries (LMXBs), and the low frequency and low coherence QPOs of CVs with the horizontal branch oscillations (or the broad noise component identified as such) of LMXBs. Assuming that the same mechanisms produce the QPOs of white dwarf, neutron star, and black hole binaries, this correlation has important implications for QPO models.Comment: 8 pages including 7 encapsulated postscript figures; LaTeX format, uses aipproc.cls, aip-8d.clo, and aipxfm.sty; to appear in the proceedings of X-Ray Timing 2003: Rossi and Beyond, ed. P. Kaaret, F. K. Lamb, & J. H. Swank (Melville, NY: AIP