J/A+A/510/A100      Four new SDSS eclipsing systems          (Southworth+, 2010)
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Beginning of ReadMe : J/A+A/510/A100 Four new SDSS eclipsing systems (Southworth+, 2010) ================================================================================ Orbital periods of cataclysmic variables identified by the SDSS. VII. Four new eclipsing systems. Southworth J., Copperwheat C.M., Gaensicke B.T., Pyrzas S. <Astron. Astrophys. 510, A100 (2010)> =2010A&A...510A.100S ================================================================================ ADC_Keywords: Binaries, eclipsing ; Planets ; Photometry Keywords: stars: dwarf novae - stars: novae, cataclysmic variables - stars: binaries: eclipsing - stars: white dwarfs Abstract: We present photometry of nine cataclysmic variable stars identified by the Sloan Digital Sky Survey, aimed at measuring the orbital periods of these systems. Four of these objects show deep eclipses, from which we measure their orbital periods. The light curves of three of the eclipsing systems are also analysed using the LCURVE code, and their mass ratios and orbital inclinations determined. SDSS J075059.97+141150.1 has an orbital period of 134.1564+/-0.0008min, making it a useful object with which to investigate the evolutionary processes of cataclysmic variables. SDSS J092444.48+080150.9 has a period of 131.2432+/-0.0014min and is probably magnetic. The white dwarf ingress and egress phases are very deep and short, and there is no clear evidence that this object has an accretion disc. SDSS J115207.00+404947.8 and SDSS J152419.33+220920.1 are nearly identical twins, with periods of 97.5+/-0.4 and 93.6+/-0.5min and mass ratios of 0.14+/-0.03 and 0.17+/-0.03, respectively. Their eclipses have well-defined white dwarf and bright spot ingress and egress features, making them excellent candidates for detailed study. All four of the orbital periods presented here are shorter than the 2-3 hour period gap observed in the known population of cataclysmic variables. Description: Light curves of four eclipsing cataclysmic variable stars and five non-eclipsing cataclysmic variables are presented. The data were obtained using the ESO/NTT/EFOSC2 and ING/WHT/ACAM telescopes and instruments. For the NTT a Tyson B filter was used (ESO filter #724) whereas for the WHT a Johnson V filter was used.

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