Orbital periods of cataclysmic variables identified by the SDSS. VII, Four new eclipsing systems \ud

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Southworth, J. (John) ; Copperwheat, C. M. ; Gänsicke, B. T. (Boris T.) ; Pyrzas, S. (2010)

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.\ud SDSS J075059.97+141150.1 has an orbital period of 134.1564 ± 0.0008 min, 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 ± 0.0014 min 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\ud 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 ± 0.5 min 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\ud here are shorter than the 2–3 h period gap observed in the known population of cataclysmic variables.
  • References (23)
    23 references, page 1 of 3

    Bailey, J. 1979, MNRAS, 187, 645

    Bertin, E., & Arnouts, S. 1996, A&AS, 117, 393

    Beuermann, K. 2006, A&A, 460, 783

    Beuermann, K., Baraffe, I., Kolb, U., & Weichhold, M. 1998, A&A, 339, 518 Bruch, A. 1992, A&A, 266, 237

    Bruch, A. 2000, A&A, 359, 998

    Buzzoni, B., Delabre, B., Dekker, H., et al. 1984, The Messenger, 38, 9 Copperwheat, C. M., Marsh, T. R., Dhillon, V. S., et al. 2010, MNRAS, 402, 1824

    de Kool, M. 1992, A&A, 261, 188

    de Kool, M., & Ritter, H. 1993, A&A, 267, 397

    Dhillon, V. S., Marsh, T. R., Stevenson, M. J., et al. 2007, MNRAS, 378, 825 Dillon, M., Gänsicke, B. T., Aungwerojwit, A., et al. 2008, MNRAS, 386, 1568 Downes, R. A., Webbink, R. F., Shara, M. M., et al. 2001, PASP, 113, 764 Drake, A. J., Djorgovski, S. G., Mahabal, A., et al. 2009, ApJ, 696, 870 Gänsicke, B. T., Szkody, P., de Martino, D., et al. 2003, ApJ, 594, 443 Gänsicke, B. T., Araujo-Betancor, S., Hagen, H.-J., et al. 2004, A&A, 418, 265 Gänsicke, B. T., Rodríguez-Gil, P., Marsh, T. R., et al. 2006, MNRAS, 365, 969 Gänsicke, B. T., Dillon, M., Southworth, J., et al. 2009, MNRAS, 397, 2170 Hellier, C. 2001, Cataclysmic Variable Stars: How and Why they Vary, SpringerPraxis books in astronomy and space science (New York: Springer Verlag) Jordi, K., Grebel, E. K., & Ammon, K. 2006, A&A, 460, 339 Knigge, C. 2006, MNRAS, 373, 484

    Kolb, U. 1993, A&A, 271, 149

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