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24 April 2024 |
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The Intermediate Polar EI UMa: A Pre-Polar Cataclysmic Variable | | Tamara W. Reimer
; William F. Welsh
; Koji Mukai
; F. A. Ringwald
; | | Date: |
24 Feb 2008 | | Abstract: | We present optical and X-ray time-series photometry of EI UMa that reveal
modulation at 746 and 770 s, which we interpret as the white dwarf spin and
spin-orbit sidebands. These detections, combined with previous X-ray studies,
establish EI UMa as an intermediate polar. We estimate the mass accretion rate
to be ~ 3.6 x 10^{17} g s^{-1}, which is close to, and likely greater than, the
critical rate above which dwarf nova instabilities are suppressed. We also
estimate the white dwarf to have a large magnetic moment mu > (3.4 +/- 0.2) x
10^{33} G cm^3. The high mass accretion rate and magnetic moment imply the
existence of an accretion ring rather than a disk, and along with the
relatively long orbital period, these suggest that EI UMa is a rare example of
a pre-polar cataclysmic variable. | | Source: | arXiv, 0802.3542 | | Services: | Forum | Review | PDF | Favorites | |
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