Are the INTEGRAL Intermediate Polars Different?

Details Are the INTEGRAL Intermediate Polars Different? Are the INTEGRAL Intermediate Polars Different?

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..230n&link_type=abstract

A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10

Astronomy and Astrophysics

Astronomy

1

Astronomical And Space-Research Instrumentation, X-Ray Binaries, Stellar Content And Populations, Morphology And Overall Structure, Accretion And Accretion Disks

Scientific paper

One of the biggest surprises of the INTEGRAL mission was the detection of large numbers of magnetic cataclysmic variables-in particular the intermediate polar (IP) subclass. Not only have many previously known systems been detected, but many new ones have also been found and subsequently classified from optical follow-up observations, increasing the sample of IPs by ~15 %. We have recently been using a particle hydrodynamic code to investigate the accretion flows of IPs and determine the equilibrium spin-rates and accretion flow patterns across a wide range of orbital periods, mass ratios and magnetic field strengths. We use the results of these accretion flow simulations to examine whether the INTEGRAL IPs differ from the overall population and conclude that they do not. Most IPs are likely to be INTEGRAL sources, given sufficient exposure. Currently however, none of the `EX Hya-like' IPs, with large spin-to-orbital period ratios and short orbital periods, are detected by INTEGRAL. If this continues to be the case once the whole sky has a comparable INTEGRAL exposure, it may indicate that the ring-like mode of accretion which we demonstrate occurs in these systems is responsible for their different appearance.

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