IPHAS J062746.41+014811.3: A DEEPLY ECLIPSING INTERMEDIATE POLAR

Abstract

We present time-resolved photometry of a cataclysmic variable discovered in\nthe Isaac Newton Telescope Photometric Halpha Survey of the northern galactic\nplane, IPHAS J062746.41+014811.3 and classify the system as the fourth deeply\neclipsing intermediate polar known with an orbital period of Porb=8.16 h, and\nspin period of Pspin=2210 s. The system shows mild variations of its\nbrightness, that appear to be accompanied by a change in the amplitude of the\nspin modulation at optical wavelengths, and a change in the morphology of the\neclipse profile. The inferred magnetic moment of the white dwarf is mu_wd = 6-7\nx 10^33 Gcm^3, and in this case IPHAS J0627 will either evolve into a\nshort-period EX Hya-like intermediate polar with a large Pspin\\Porb ratio, or,\nperhaps more likely, into a synchronised polar. Swift observations show that\nthe system is an ultraviolet and X-ray source, with a hard X-ray spectrum that\nis consistent with those seen in other intermediate polars. The ultraviolet\nlight curve shows orbital modulation and an eclipse, while the low\nsignal-to-noise ratio X-ray light curve does not show a significant modulation\non the spin period. The measured X-ray flux is about an order of magnitude\nlower than would be expected from scaling by the optical fluxes of well-known\nX-ray selected intermediate polars.\n