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Gavin Ramsay Mark Cropper Kinwah Wu K. O. Mason Pasi Hakala 《Monthly notices of the Royal Astronomical Society》2000,311(1):75-84
We have detected the optical counterpart of the proposed double degenerate polar RX J1914+24. The I -band light curve is modulated on the 9.5-min period seen in X-rays. There is no evidence for any other periods. No significant modulation is seen in J . The infrared colours of RX J1914+24 are not consistent with a main-sequence dwarf secondary star. Our ASCA spectrum of RX J1914+24 is typical of a heavily absorbed polar and our ASCA light curve also shows only the 9.5-min period. We find that the folded I band and X-ray light curves are out of phase. We attribute the I -band flux to the irradiated face of the donor star. The long-term X-ray light curve shows a variation in the observed flux of up to an order of magnitude. These observations strengthen the view that RX J1914+24 is indeed the first double degenerate polar to be detected. In this light, we discuss the synchronizing mechanisms in such a close binary and other system parameters. 相似文献
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Curtis J. Saxton Kinwah Wu Mark Cropper Gavin Ramsay 《Monthly notices of the Royal Astronomical Society》2005,360(3):1091-1104
We use a two-temperature hydrodynamical formulation to determine the temperature and density structures of the post-shock accretion flows in magnetic cataclysmic variables (mCVs) and calculate the corresponding X-ray spectra. The effects of two-temperature flows are significant for systems with a massive white dwarf and a strong white-dwarf magnetic field. Our calculations show that two-temperature flows predict harder keV spectra than one-temperature flows for the same white-dwarf mass and magnetic field. This result is insensitive to whether the electrons and ions have equal temperature at the shock, but depends on the electron–ion exchange rate, relative to the rate of radiative loss along the flow. White-dwarf masses obtained by fitting the X-ray spectra of mCVs using hydrodynamic models including the two-temperature effects will be lower than those obtained using single-temperature models. The bias is more severe for systems with a massive white dwarf. 相似文献
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G. W. Ramsay 《新西兰海洋与淡水研究杂志》2013,47(3):569-571
Marion and Prince Edward Islands. Report on the South African Biological and Geological Expedition 1965–1966. Edited by E. M. van Zinderen Bakker, J. M. Winterbottom and R. A. Dyer. Balkema, Cape Town. $25.33. 相似文献