Bibcode
Aungwerojwit, A.; Gänsicke, B. T.; Wheatley, P. J.; Pyrzas, S.; Staels, B.; Krajci, T.; Rodríguez-Gil, P.
Bibliographical reference
The Astrophysical Journal, Volume 758, Issue 2, article id. 79 (2012).
Advertised on:
10
2012
Journal
Citations
17
Refereed citations
14
Description
We present time-resolved photometry of a cataclysmic variable discovered
in the Isaac Newton Telescope Photometric Hα Survey of the
northern galactic plane, IPHAS J062746.41+014811.3, and classify the
system as the fourth deeply eclipsing intermediate polar known with an
orbital period of P orb = 8.16 hr and a spin period of P
spin = 2210 s. The system shows mild variations of its
brightness that appear to be accompanied by a change in the amplitude of
the spin modulation at optical wavelengths and a change in the
morphology of the eclipse profile. The inferred magnetic moment of the
white dwarf is μwd ~ (6-7) × 1033 G
cm3, and in this case IPHAS J062746.41+014811.3 will evolve
either into a short-period EX Hya-like intermediate polar with a large P
spin/Porb ratio or, perhaps more likely, into a
synchronized polar. Swift observations show that the system is an
ultraviolet and X-ray source, with a hard X-ray spectrum that is
consistent with those seen in other intermediate polars. The ultraviolet
light curve shows orbital modulation and an eclipse, while the low
signal-to-noise ratio X-ray light curve does not show a significant
modulation on the spin period. The measured X-ray flux is about an order
of magnitude lower than would be expected from scaling by the optical
fluxes of well-known X-ray-selected intermediate polars.
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Pablo
Rodríguez Gil