Ramsay, G; Hakala, P; Kinwah, W; Cropper, M; Mason, KO; Córdova, FA; Priedhorsky, W; (2005) XMM-Newton observations of the ultra-compact binary RX J1914+24. Monthly Notices of the Royal Astronomical Society , 357 (1) 49 - 55. 10.1111/j.1365-2966.2005.08574.x.

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Abstract

We present XMM–Newton observations of the 569-s-period system RX J1914+24 (V407 Vul). This period is believed to represent the binary orbital period making it an ultracompact binary system. By comparing the phase of the rise to maximum X-ray flux at various epochs (this includes observations made using ROSAT, ASCA and Chandra) we find that the system is spinning up at a rate of 3.17 ± 0.07 × 10−12 s s−1. We find that the spectra soften as the X-ray flux declines towards the off-phase of the 569-s period. Further, the spectra are best fitted by an absorbed blackbody component together with a broad emission feature around 0.59 keV. This emission feature is most prominent at the peak of the on-phase. We speculate on its origin.

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