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• W1856119273 abstract "We present time-resolved optical spectroscopy of the dwarf nova CSS100603:112253-111037. Its optical spectrum is rich in helium, with broad, double-peaked emission lines produced in an accretion disc. We measure a line flux ratio HeI5876/H_alpha = 1.49 +/- 0.04, a much higher ratio than is typically observed in dwarf novae. The orbital period, as derived from the radial velocity of the line wings, is 65.233 +/- 0.015 minutes. In combination with the previously measured superhump period, this implies an extreme mass ratio of M_2/M_1 = 0.017 +/- 0.004. The H_alpha and HeI6678 emission lines additionally have a narrow central spike, as is often seen in the spectra of AM CVn type stars. Comparing its properties with CVs, AM CVn systems and hydrogen binaries below the CV period minimum, we argue that CSS100603:112253-111037 is the first compelling example of an AM CVn system forming via the evolved CV channel. With the addition of this system, evolved cataclysmic variables (CVs) now account for seven per cent of all known semi-detached white dwarf binaries with Porb < 76 min. Two recently discovered binaries may further increase this figure. Although the selection bias of this sample is not yet well defined, these systems support the evolved CV model as a possible formation channel for ultracompact accreting binaries. The orbital periods of the three ultracompact hydrogen accreting binaries overlap with those of the long period AM CVn stars, but there are currently no known systems in the period range 67 - 76 minutes." @default.
• W1856119273 created "2016-06-24" @default.
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• W1856119273 date "2012-08-30" @default.
• W1856119273 modified "2023-10-04" @default.
• W1856119273 title "CSS100603:112253−111037: a helium-rich dwarf nova with a 65 min orbital period" @default.
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• W1856119273 doi "https://doi.org/10.1111/j.1365-2966.2012.21724.x" @default.
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