Sample of Cataclysmic Variables from 400d X-ray Survey

A. Meshcheryakov; A. Semena; A. Tkachenko; M. Eselevich; M. Pavlinsky; M. Revnivtsev; R. Burenin; S. Dodonov; V. Vorobyev

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Sample of Cataclysmic Variables from 400d X-ray Survey

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arxiv 1612.08407 v1 pith:SM4LLULI submitted 2016-12-26 astro-ph.HE

R. Burenin , M. Revnivtsev , A. Tkachenko , V. Vorobyev , A. Semena , A. Meshcheryakov , S. Dodonov , M. Eselevich

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M. Pavlinsky

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We present a sample of eight cataclysmic variables (CVs) identified among the X-ray sources of the 400 square degree (400d) X-ray ROSAT/PSPC survey. Based on this sample, we have obtained preliminary constraints on the X-ray luminosity function of CVs in the solar neighbourhood in the range of low luminosities, L_X=~1e29-1e30 erg/s (0.5-2 keV). We show that the logarithmic slope of the CV luminosity function in this luminosity range is less steep than that at L_X>1e31 erg/s. Our results show that of order of thousand CVs will be detected in the SRG/eROSITA all-sky survey at high Galactic latitudes, which will allow to obtain much more accurate measurements of their X-ray luminosity function.

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