An EUV Study of the Intermediate Polar EX Hydrae

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

27 pages, 7 figures, accepted for publication in ApJ

Scientific paper

10.1086/342140

On 2000 May 5, we began a large multi-wavelength campaign to study the intermediate polar, EX Hydrae. The simultaneous observations from six satellites and four telescopes were centered around a one million second observation with EUVE. Although EX Hydrae has been studied previously with EUVE, our higher signal-to-noise 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 Hydrae 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 n_e=10^10-10^11 cm^-3 for the emitting plasma. This paper is the first in a series detailing our results from this multi-wavelength observational campaign.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

An EUV Study of the Intermediate Polar EX Hydrae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An EUV Study of the Intermediate Polar EX Hydrae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An EUV Study of the Intermediate Polar EX Hydrae will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-454174

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.