SIMBAD references

2008ApJ...678..376R - Astrophys. J., 678, 376-384 (2008/May-1)

The intermediate polar EI UMa: a prepolar cataclysmic variable.


Abstract (from CDS):

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 ∼3.6x1017 g/s, 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 µ>(3.4±0.2)x1033 G.cm3. 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 prepolar cataclysmic variable.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Stars: Novae, Cataclysmic Variables - Stars: Dwarf Novae - stars: individual (EI UMa)

Simbad objects: 16

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