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  • IPHAS J062746.41+014811.3: ...
    AUNGWEROJWIT, A; GÄNSICKE, B. T; WHEATLEY, P. J; PYRZAS, S; STAELS, B; KRAJCI, T; RODRIGUEZ-GIL, P

    The Astrophysical journal, 10/2012, Letnik: 758, Številka: 2
    Journal Article

    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 P sub(orb) = 8.16 hr and a spin period of P sub(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 mu sub(wd) ~ (6-7) x 10 super(33) G cm super(3), and in this case IPHAS J062746.41+014811.3 will evolve either into a short-period EX Hya-like intermediate polar with a large R sub(spin)/P sub(orb) 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.