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IPHAS J062746.41+014811.3: A deeply eclipsing intermediate polar

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Aungwerojwit, A. (Amornrat), Gänsicke, B. T. (Boris T.), Wheatley, P. J., Pyrzas, S., Staels, B., Krajci, T. and Rodríguez-Gil, P. (2012) IPHAS J062746.41+014811.3: A deeply eclipsing intermediate polar. The Astrophysical Journal, Vol. 758 (No. 2). p. 79. doi:10.1088/0004-637X/758/2/79 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.1088/0004-637X/758/2/79

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Abstract

We present time-resolved photometry of a cataclysmic variable discovered in the Isaac Newton Telescope Photometric Halpha 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 Porb=8.16 h, and spin period of Pspin=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 mu_wd = 6-7 x 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a short-period EX Hya-like intermediate polar with a large Pspin\Porb ratio, or, perhaps more likely, into a synchronised 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.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0004-637X
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Vol. 758
Number: No. 2
Page Range: p. 79
DOI: 10.1088/0004-637X/758/2/79
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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