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- W3099123871 abstract "On 2000 May 5, we began a large, multiwavelength campaign to study the intermediate polar (IP) EX Hydrae. The simultaneous observations from six satellites and four telescopes were centered around a 1 million second observation with Extreme Ultraviolet Explorer (EUVE). Although EX Hya has been studied previously with EUVE, our higher signal-to-noise ratio observations present new results and challenge the current IP models. Previously unseen dips in the light curve are reminiscent of the stream dips seen in polar light curves. Also of interest is the temporal extent of the bulge dip, approximately 0.5 in phase, implying that the bulge extends over half of the accretion disk. We propose that the magnetic field in EX Hya is strong enough (a few MG) to begin pulling material directly from the outer edge of the disk, thereby forming a large accretion curtain, which would produce a very broad bulge dip. This would also result in magnetically controlled accretion streams originating from the outer edge of the disk. We also present a period analysis of the photometric data, which shows numerous beat frequencies with strong power and also intermittent and wandering frequencies, an indication that physical conditions within EX Hya changed over the course of the observation. Iron spectral line ratios give a temperature of log T = 6.5-6.9 K for all spin phases and a poorly constrained density of ne = 1010-1011 cm-3 for the emitting plasma. This paper is the first in a series detailing our results from this multiwavelength observational campaign." @default.
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- W3099123871 date "2002-09-20" @default.
- W3099123871 modified "2023-10-14" @default.
- W3099123871 title "An Extreme‐Ultraviolet Study of the Intermediate Polar EX Hydrae" @default.
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- W3099123871 doi "https://doi.org/10.1086/342140" @default.
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