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Dillon, Monihar
Languages: English
Types: Doctoral thesis
Subjects: QB

Classified by OpenAIRE into

arxiv: Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::High Energy Astrophysical Phenomena
Over the years, substantial effort has gone into calculating models of the intrinsic population of galactic Cataclysmic Variables (CVs). However, comparison with the observed properties of the known CV sample has consistently failed to match the predictions put forward by the ‘disrupted magnetic braking’ model of CV evolution. Some of the discrepancies have been blamed on the heterogeneous set of known CVs, which are not well-suited for a quantitative test of the population models.\ud \ud The Sloan Digital Sky Survey (SDSS) has dramatically improved the observational side of CV population studies. Sampling a large volume in ugriz colour space and extending deeper than any previous large-scale survey, SDSS provides the most homogeneous and complete sample of CVs to date.\ud \ud At the time of writing, the sample of SDSS CVs contains 213 systems, of which 177 are new discoveries. Establishing the detailed properties of these CV is a major task. The work presented in this thesis is part of a larger effort to derive the orbital period distribution of SDSS CV sample.\ud \ud In this thesis, I present my contribution and results of time-series photometric and spectroscopic observations of a total of 29 SDSS CVs. I provide a discussion of their properties and determine orbital periods for 20 systems. I also provide a quantitative analysis of the new sample of CVs from SDSS and compare their intrinsic qualities with the previously known population of CVs.\ud \ud The results show that the period distribution of the SDSS CVs differs from that of the previously known CVs at a 3-σ level. A substantially larger fraction of below-the-gap to above the-gap systems is observed, accompanied by a prominent accumulation of CVs at the orbital period minimum. This result is important, as the accumulation of systems at short orbital periods has been long theorised but never proved observationally. More specifically, the origin of the 80–86min period spike is entirely due to the new CVs identified in SDSS. The systems in the period spike also differ in spectral morphology and accretion activity from the longer-period CVs. Indeed ∼ 20% of the CVs identified by SDSS have white-dwarf dominated spectra indicating low mass transfer rates and late spectral type donors, the majority of which have been found close to the period minimum.\ud \ud A homogeneously selected sample of CVs, with well defined parameters has been long overdue and the results from SDSS are very promising. With this improved observational evidence, theoretical models can be modified to re-address the discrepancies in the current theories that have long plagued our understanding of CV evolution.
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    • Anderson, S. F., et al., 2005, AJ, 130, 2230 Andronov, N., Pinsonneault, M., Sills, A., 2003, ApJ, 582, 358 Araujo-Betancor, S., Ga¨nsicke, B. T., Long, K. S., Beuermann, K., de Martino, D., Sion, E. M., Szkody, P., 2005a, ApJ, 622, 589
    • Araujo-Betancor, S., Ga¨nsicke, B. T., Long, K. S., Beuermann, K., de Martino, D., Sion, E. M., Szkody, P., 2005b, ApJ, 622, 589
    • Beers, T. C., Rossi, S., Ulrich, D., Wilhelm, R., 1996, 112, 1188 Berger, J., Fringant, A.-M., 1984, A&A, 58, 565 Bergeron, P., Wesemael, F., Beauchamp, A., 1995, PASP, 107, 1047 Bertin, E., Arnouts, S., 1996, A&AS, 117, 393 Beuermann, K., Thomas, H.-C., Reinsch, K., Schwope, A. D., Tru¨mper, J., Voges, W., 1999, A&A, 347, 47
    • Bond, H. E., White, R. L., Becker, R. H., O'Brien, M. S., 2002, PASP, 114, 1359 Bonnet-Bidaud, J. M., Mouchet, M., Somova, T. A., Somov, N. N., 1996, A&A, 306, 199 Boyd, D., Oksanen, A., Henden, A., 2006, Journal of the British Astronomical Association, 116, 187
    • Boyd, D., Shears, J., Koff, R., 2007, ArXiv e-prints Bruch, A., Engel, A., 1994, A&AS, 104, 79 Esamdin, A., Dong, X., Zhao, Y., 1997, IAU Circ., 6763 Farihi, J., Burleigh, M. R., Hoard, D. W., 2008, ApJ, 674, 421 Faulkner, J., 1971, ApJ Lett., 170, L99 Feline, W. J., Dhillon, V. S., Marsh, T. R., Brinkworth, C. S., 2004a, MNRAS, 355, 1 Feline, W. J., Dhillon, V. S., Marsh, T. R., Stevenson, M. J., Watson, C. A., Brinkworth, C. S., 2004b, MNRAS, 347, 1173
    • Feline, W. J., Dhillon, V. S., Marsh, T. R., Watson, C. A., Littlefair, S. P., 2005, MNRAS, 364, 1158
    • Frescura, F. A. M., Engelbrecht, C. A., Frank, B. S., 2007, ArXiv e-prints Fukugita, M., Ichikawa, T., Gunn, J. E., Doi, M., Shimasaku, K., Schneider, D. P., 1996, AJ, 111, 1748
    • Ga¨nsicke, B. T., Szkody, P., Howell, S. B., Sion, E. M., 2005, ApJ, 629, 451 Ga¨nsicke, B. T., 2000, Reviews of Modern Astronomy, 13, 151 Ga¨nsicke, B. T., 2005, in Hameury & Lasota (2005), p. 3, p. 3 Ga¨nsicke, B. T., Sion, E. M., Beuermann, K., Fabian, D., Cheng, F. H., Krautter, J., 1999, A&A, 347, 178
    • Ga¨nsicke, B. T., Fried, R. E., Hagen, H.-J., Beuermann, K., Engels, D., Hessman, F. V., Nogami, D., Reinsch, K., 2000, A&A, 356, L79
    • Ga¨nsicke, B. T., Fischer, A., Silvotti, R., de Martino, D., 2001, A&A, 372, 557 Ga¨nsicke, B. T., Beuermann, K., Reinsch, K., eds., 2002a, The Physics of Cataclysmic Variables and Related Objects, ASP Conf. Ser. 261
    • Ga¨nsicke, B. T., Hagen, H. J., Engels, D., 2002b, in Ga¨nsicke et al. (2002a), p. 190, p. 190 Ga¨nsicke, B. T., Hagen, H. J., Engels, D., 2002c, in Ga¨nsicke et al. (2002a), p. 190, p. 190 Ga¨nsicke, B. T., Araujo-Betancor, S., Hagen, H.-J., Harlaftis, E. T., Kitsionas, S., Dreizler, S., Engels, D., 2004, A&A, 418, 265
    • Ga¨nsicke, B. T., et al., 2003, ApJ, 594, 443 Harrison, T. E., Johnson, J. J., McArthur, B. E., Benedict, G. F., Szkody, P., Howell, S. B., Gelino, D. M., 2004, AJ, 127, 460
    • Hoard, D. W., Linnell, A. P., Szkody, P., Fried, R. E., Sion, E. M., Hubeny, I., Wolfe, M. A., 2004, ApJ, 604, 346
    • Homer, L., Szkody, P., Chen, B., Henden, A., Schmidt, G., Anderson, S. F., Silvestri, N. M., Brinkmann, J., 2006a, AJ, 131, 562
    • Homer, L., Szkody, P., Henden, A., Chen, B., Schmidt, G. D., Fraser, O. J., West, A. A., 2006b, AJ, 132, 2743
    • Katajainen, S., Lehto, H. J., Piirola, V., Karttunen, H., Piironen, J., 2000, A&A, 357, 677 Katajainen, S., Butters, O. W., Norton, A. J., Lehto, H. J., Piirola, V., 2007, A&A, 475, 1011 Kato, T., Nogami, D., Matsumoto, K., Baba, H., 2004, PASJ, 56, 109 Kilkenny, D., O'Donoghue, D., Koen, C., Stobie, R. S., Chen, A., 1997, MNRAS, 287, 867 Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Ga¨nsicke, B. T., Copperwheat, C., 2008, in Phelan, D., Ryan, O., Shearer, A., eds., High Time Resolution Astrophysics: The Universe at SubSecond Timescales, vol. 984 of American Institute of Physics Conference Series, p. 23 Lupton, R., Gunn, J. E., Ivezic´, Z., Knapp, G. R., Kent, S., 2001, in Harnden, Jr., F. R., Primini, F. A., Payne, H. E., eds., Astronomical Data Analysis Software and Systems X, vol. 238 of Astronomical Society of the Pacific Conference Series, p. 269
    • Mackie, J., 1920, Astronomische Nachrichten, 210, 79 Mennickent, R. E., Tovmassian, G., Zharikov, S. V., Tappert, C., Greiner, J., Ga¨nsicke, B. T., Fried, R. E., 2002, A&A, 383, 933
    • Morris, S. L., Schmidt, G. D., Liebert, J., Stocke, J., Gioia, I. M., Maccacaro, T., 1987, ApJ, 314, 641
    • Mukadam, A. S., Winget, D. E., von Hippel, T., Montgomery, M. H., Kepler, S. O., Costa, A. F. M., 2004, ApJ, 612, 1052
    • Mukadam, A. S., Ga¨nsicke, B. T., Szkody, P., Aungwerojwit, A., Howell, S. B., Fraser, O. J., Silvestri, N. M., 2007, ApJ, 667, 433
    • Nilsson, R., Uthas, H., Ytre-Eide, M., Solheim, J.-E., Warner, B., 2006, MNRAS, 370, L56 Nogami, D., Kato, T., Masuda, S., Hirata, R., Matsumoto, K., Tanabe, K., Yokoo, T., 1995, PASJ, 47, 897
    • Nogami, D., Kato, T., Baba, H., Masuda, S., 1998, PASJ, 50, L1 Nogami, D., Kato, T., Baba, H., Nova´k, R., Lockley, J. J., Somers, M., 2001, MNRAS, 322, 79 Norton, A. J., Wynn, G. A., Somerscales, R. V., 2004, ApJ, 614, 349 Osborne, J. P., Beardmore, A. P., Wheatley, P. J., Hakala, P., Watson, M. G., Mason, K. O., Hassall, B. J. M., King, A. R., 1994, MNRAS, 270, 650
    • Paczynski, B., 1976, in Eggleton, P., Mitton, S., Whelan, J., eds., IAU Symp. 73: Structure and Evolution of Close Binary Systems, D. Reidel, Dordrecht, p. 75
    • Patterson, J., Kemp, J., Jensen, L., Vanmunster, T., Skillman, D. R., Martin, B., Fried, R., Thorstensen, J. R., 2000a, PASP, 112, 1567
    • Patterson, J., et al., 1998b, PASP, 110, 1290 Patterson, J., et al., 2000b, PASP, 112, 1584 Patterson, J., et al., 2003, PASP, 115, 1308 Pavlenko, E., et al., 2007, in Napiwotzki, R., Burleigh, M. R., eds., 15th European Workshop on White Dwarfs, vol. 372 of Astronomical Society of the Pacific Conference Series, p. 511 Peters, C. S., Thorstensen, J. R., 2005, PASP, 117, 1386 Podsiadlowski, P., Han, Z., Rappaport, S., 2003, MNRAS, 340, 1214 Pretorius, M. L., Knigge, C., O'Donoghue, D., Henry, J. P., Gioia, I. M., Mullis, C. R., 2007c, MNRAS, 382, 1279
    • Pringle, J. E., Wade, R. A., 1985, Astronomy Express, 1, 159 Rappaport, S., Joss, P. C., Webbink, R. F., 1982, ApJ, 254, 616 Rappaport, S., Joss, P. C., Verbunt, F., 1983, ApJ, 275, 713 Rebassa-Mansergas, A., Ga¨nsicke, B. T., Rodr´ıguez-Gil, P., Schreiber, M. R., Koester, D., 2007, MNRAS, 382, 1377
    • Remillard, R. A., Schachter, J. F., Silber, A. D., Slane, P., 1994, ApJ, 426, 288 Rodr´ıguez-Gil, P., Ga¨nsicke, B. T., Hagen, H.-J., Marsh, T. R., Harlaftis, E., Kitsionas, S., Engels, D., 2005a, A&A, 431, 269
    • Rodr´ıguez-Gil, P., Schmidtobreick, L., Ga¨nsicke, B. T., 2007a, MNRAS, 374, 1359 Rodr´ıguez-Gil, P., et al., 2005b, A&A, 440, 701 Rodr´ıguez-Gil, P., et al., 2007b, MNRAS, 377, 1747 Roelofs, G. H. A., Groot, P. J., Steeghs, D., Nelemans, G., 2004, in Tovmassian, G., Sion, E., eds., Compact Binaries and Beyond, no. 20 in Conf. Ser., RMAA, p. 254
    • Roelofs, G. H. A., Groot, P. J., Marsh, T. R., Steeghs, D., Barros, S. C. C., Nelemans, G., 2005, MNRAS, 361, 487
    • Roelofs, G. H. A., Nelemans, G., Groot, P. J., 2007, MNRAS, 382, 685 Rogoziecki, P., Schwarzenberg-Czerny, A., 2001, MNRAS, 323, 850 Schreiber, M. R., Ga¨nsicke, B. T., 2003, A&A, 406, 305 Schwarzenberg-Czerny, A., 1989, MNRAS, 241, 153 Schwarzenberg-Czerny, A., 1996, ApJ Lett., 460, L107 Schwope, A. D., Naundorf, C. E., Thomas, H.-C., Beuermann, K., 1991, A&A, 244, 373 Schwope, A. D., Brunner, H., Buckley, D., Greiner, J., Heyden, K. v. d., Neizvestny, S., Potter, S., Schwarz, R., 2002, A&A, 396, 895
    • Shafter, A. W., Szkody, P., 1984, ApJ, 276, 305 Shafter, A. W., Szkody, P., Thorstensen, J. R., 1986, ApJ, 308, 765 Shears, J., Brady, S., Foote, J., Starkey, D., Vanmunster, T., 2007a, ArXiv e-prints, 711 Shears, J., Klingenberg, G., de Ponthiere, P., 2007b, Journal of the British Astronomical Association, 117, 331
    • Silber, A. D., Remillard, R. A., Horne, K., Bradt, H. V., 1994, ApJ, 424, 955 Sills, A., Pinsonneault, M. H., Terndrup, D. M., 2000, ApJ, 534, 335 Southworth, J., Marsh, T. R., Ga¨nsicke, B. T., Aungwerojwit, A., Hakala, P., de Martino, D., Lehto, H., 2007b, MNRAS, 382, 1145
    • Spruit, H. C., Ritter, H., 1983, A&A, 124, 267 Stanishev, V., Kraicheva, Z., Genkov, V., 2006, A&A, 455, 223 Steeghs, D., Perryman, M. A. C., Reynolds, A., de Bruijne, J. H. J., Marsh, T., Dhillon, V. S., Peacock, A., 2003, MNRAS, 339, 810
    • Thorstensen, J. R., Fenton, W. H., 2002, PASP, 114, 74 Thorstensen, J. R., Taylor, C. J., 2001, MNRAS, 326, 1235 Thorstensen, J. R., Smak, J., Hessman, F. V., 1985, PASP, 97, 437 Thorstensen, J. R., Davis, M. K., Ringwald, F. A., 1991a, AJ, 102, 683 Thorstensen, J. R., Ringwald, F. A., Wade, R. A., Schmidt, G. D., Norsworthy, J. E., 1991b, AJ, 102, 272
    • Thorstensen, J. R., Patterson, J. O., Shambrook, A., Thomas, G., 1996, PASP, 108, 73 Thorstensen, J. R., Fenton, W. H., Patterson, J., Kemp, J., Halpern, J., Baraffe, I., 2002a, PASP, 114, 1117
    • Thorstensen, J. R., Fenton, W. H., Patterson, J. O., Kemp, J., Krajci, T., Baraffe, I., 2002b, ApJ Lett., 567, L49
    • Thorstensen, J. R., Patterson, J., Kemp, J., Vennes, S., 2002c, PASP, 114, 1108 Thorstensen, J. R., Fenton, W. H., Taylor, C. J., 2004, PASP, 116, 300 Tovmassian, G. H., Greiner, J., Zharikov, S. V., Echevarr´ıa, J., Kniazev, A., 2001, A&A, 380, 504
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