Remember Me
Or use your Academic/Social account:


Or use your Academic/Social account:


You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.


Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message


Verify Password:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Pyrzas, S.
Languages: English
Types: Doctoral thesis
Subjects: QB

Classified by OpenAIRE into

arxiv: Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics
Close binaries containing compact objects come in many different forms, but have one thing\ud in common: their evolution involves at least one common envelope phase and angular momentum\ud losses. However, many aspects of these two fundamental processes are still poorly understood. Ample\ud observational input holds the key to improving our understanding, as only then can theoretical\ud models be properly calibrated and tested. Close binaries containing a white dwarf are perhaps the\ud best-suited class of objects to provide such input, due to their ubiquity. White dwarf binaries that additionally\ud display eclipses are of added interest, as accurate and model-independent determinations\ud of fundamental stellar parameters, such as the masses and radii of the binary components, can only\ud be obtained in such systems.\ud In this thesis, I present a study of eclipsing white dwarf binaries. I identify SDSSJ 0110+1326,\ud SDSSJ 0303+0054, SDSSJ 1210+3347, SDSSJ 1435+3733 and SDSSJ 1548+4057 as new eclipsing,\ud detached, post-common-envelope, white dwarf +M-dwarf binaries. I use follow-up photometric and\ud spectroscopic observations, as well as a light curve fitting technique to measure their orbital periods,\ud and derive the masses, radii and radial velocities of the binary components. These five systems have\ud been identified as part of the first dedicated search for eclipsing post-common-envelope binaries\ud and almost double the existing population. The measurements of the stellar parameters, and others\ud obtained from similar systems, are of great value both for the calibration of the common envelope\ud equations and for testing the mass-radius relations of white dwarfs and low-mass main sequence\ud stars. I also identify HS 2325+8205 as a new eclipsing and very frequently outbursting dwarf nova.\ud Combined constraints from photometric and spectroscopic observations are used to infer the binary\ud and stellar parameters. The combination of eclipses, frequent outbursts, brightness range and\ud high declination make HS 2325+8205 an ideal laboratory for detailed studies of accretion discs and\ud accretion processes in close binaries. Finally I study the cataclysmic variable V455And, in an attempt\ud to verify the presence of non-radial pulsations in the white dwarf primary. This is achieved\ud by analysing ten-years worth of photometric observations using time-series analysis techniques and\ud Fourier transforms. The results are indeed consistent with white dwarf pulsations, although a very\ud complex behaviour of the power spectra is revealed, most likely a result of the rapid rotation of the\ud accreting white dwarf primary.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Berger, D. H., et al., 2006, ApJ, 644, 475 Bergeron, P., Wesemael, F., Beauchamp, A., 1995a, PASP, 107, 1047 Bergeron, P., Wesemael, F., Lamontagne, R., Fontaine, G., Saffer, R. A., Allard, N. F., 1995b, ApJ, 449, 258
    • Bergeron, P., Fontaine, G., Bille`res, M., Boudreault, S., Green, E. M., 2004, ApJ, 600, 404 Bertin, E., Arnouts, S., 1996, A&AS, 117, 393 Beuermann, K., Baraffe, I., Kolb, U., Weichhold, M., 1998, A&A, 339, 518 Beuermann, K., Baraffe, I., Hauschildt, P., 1999, A&A, 348, 524 Beuermann, K., et al., 2010, A&A, 521, L60+ Boeshaar, P. C., 1976, The spectral classification of M-dwarf stars, Ph.D. thesis, Ohio State Univ., Columbus.
    • Brassard, P., Fontaine, G., Wesemael, F., 1995, 96, 545 Brown, W. R., Kilic, M., Hermes, J. J., Allende Prieto, C., Kenyon, S. J., Winget, D. E., 2011, ArXiv eprints., 1107.2389
    • Casewell, S. L., Dobbie, P. D., Napiwotzki, R., Burleigh, M. R., Barstow, M. A., Jameson, R. F., 2009, MNRAS, 395, 1795
    • Castanheira, B. G., Kepler, S. O., Kleinman, S. J., Nitta, A., Fraga, L., 2010, MNRAS, 405, 2561 Copperwheat, C. M., Marsh, T. R., Dhillon, V. S., Littlefair, S. P., Hickman, R., Ga¨nsicke, B. T., Southworth, J., 2010, MNRAS, 402, 1824
    • Cropper, M., 1990, Space Sci. Rev., 54, 195 Davis, P. J., Kolb, U., Willems, B., Ga¨nsicke, B. T., 2008, MNRAS, 389, 1563 de Kool, M., van den Heuvel, E. P. J., Pylyser, E., 1987, A&A, 183, 47 De Marco, O., Passy, J.-C., Moe, M., Herwig, F., Mac Low, M.-M., Paxton, B., 2011, MNRAS, 411, 2277
    • Foulkes, S. B., Haswell, C. A., Murray, J. R., 2006, MNRAS, 366, 1399 Foulkes, S. B., Haswell, C. A., Murray, J. R., 2010, MNRAS, 401, 1275 Frank, J., King, A. R., Raine, D. J., 1985, Accretion power in astrophysics, Cambridge University Press, Cambridge
    • Fukugita, M., Ichikawa, T., Gunn, J. E., Doi, M., Shimasaku, K., Schneider, D. P., 1996, AJ, 111, 1748
    • Fulbright, M. S., Liebert, J., Bergeron, P., Green, R., 1993, ApJ, 406, 240 Ga¨nsicke, B. T., Hagen, H., Engels, D., 2002, in B. T. Ga¨nsicke, K. Beuermann, & K. Reinsch, ed., The Physics of Cataclysmic Variables and Related Objects, vol. 261 of ASP Conference Series, 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., Szkody, P., Howell, S. B., Sion, E. M., 2005, ApJ, 629, 451 Lasker, B. M., Hesser, J. E., 1969, ApJ Lett., 158, L171+ Lasker, B. M., Hesser, J. E., 1971, ApJ Lett., 163, L89+ Liebert, J., Bergeron, P., Holberg, J. B., 2005, ApJS, 156, 47 Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Ga¨nsicke, B. T., 2006a, MNRAS, 371, 1435 Littlefair, S. P., Dhillon, V. S., Marsh, T. R., Ga¨nsicke, B. T., Southworth, J., Watson, C. A., 2006b, Sci, 314, 1578
    • Livio, M., 1989, Space Sci. Rev., 50, 299 Livio, M., Soker, N., 1988, ApJ, 329, 764 Maxted, P. F. L., Marsh, T. R., Morales-Rueda, L., Barstow, M. A., Dobbie, P. D., Schreiber, M. R., Dhillon, V. S., Brinkworth, C. S., 2004, MNRAS, 355, 1143
    • Maxted, P. F. L., Napiwotzki, R., Dobbie, P. D., Burleigh, M. R., 2006, Nat, 442, 543 Maxted, P. F. L., O'Donoghue, D., Morales-Rueda, L., Napiwotzki, R., 2007, MNRAS, 376, 919 Meyer, F., Meyer-Hofmeister, E., 1981, A&A, 104, L10+ Montgomery, M. H., Williams, K. A., Winget, D. E., Dufour, P., De Gennaro, S., Liebert, J., 2008, ApJ Lett., 678, L51
    • Montgomery, M. H., et al., 2010, ApJ, 716, 84 Morales, J. C., Ribas, I., Jordi, C., 2008, A&A, 478, 507 Morales, J. C., Gallardo, J., Ribas, I., Jordi, C., Baraffe, I., Chabrier, G., 2010, ApJ, 718, 502 Morgenroth, O., 1936, Astronomische Nachrichten, 258, 265 Mukadam, A. S., Montgomery, M. H., Winget, D. E., Kepler, S. O., Clemens, J. C., 2006, ApJ, 640, 956
    • Paczynski, B., Sienkiewicz, R., 1981, ApJ Lett., 248, L27 Panei, J. A., Althaus, L. G., Benvenuto, O. G., 2000, A&A, 353, 970 Parsons, S. G., Marsh, T. R., Copperwheat, C. M., Dhillon, V. S., Littlefair, S. P., Ga¨nsicke, B. T., Hickman, R., 2010a, MNRAS, 402, 2591
    • Parsons, S. G., Marsh, T. R., Ga¨nsicke, B. T., Drake, A. J., Koester, D., 2011a, ApJ Lett., 735, L30+ Parsons, S. G., et al., 2010b, MNRAS, 407, 2362 Parsons, S. G., et al., 2011b, MNRAS, submitted Pyrzas, S., Ga¨nsicke, B. T., Rebassa-Mansergas, A., Schreiber, M., Rodr´ıguez-Gil, P., Marsh, T. R., Gomez-Moran, A. N., Koester, D., 2010, in K. Werner & T. Rauch, ed., 17th European White Dwarf Workshop, vol. 1273 of AIP Conference Series, p. 372
    • Quirion, P., Fontaine, G., Brassard, P., 2007, ApJS, 171, 219 Rappaport, S., Joss, P. C., Webbink, R. F., 1982, ApJ, 254, 616 Rappaport, S., Verbunt, F., Joss, P. C., 1983, ApJ, 275, 713 Rebassa-Mansergas, A., Ga¨nsicke, B. T., Rodr´ıguez-Gil, P., Schreiber, M. R., Koester, D., 2007, MNRAS, 382, 1377
    • Rebassa-Mansergas, A., Ga¨nsicke, B. T., Schreiber, M. R., Koester, D., Rodr´ıguez-Gil, P., 2010, MNRAS, 402, 620
    • Rebassa-Mansergas, A., Nebot Go´mez-Mora´n, A., Schreiber, M. R., Girven, J., Ga¨nsicke, B. T., 2011, MNRAS, 413, 1121
    • Schwarzenberg-Czerny, A., 1993, in P. Grosbol & R. de Ruijsscher, ed., 5. ESO/ST-ECF Data Analysis Workshop, vol. 47 of ESO Conference and Workshop Proceedings, p. 149
    • Shafter, A. W., Wheeler, J. C., Cannizzo, J. K., 1986, ApJ, 305, 261 Sion, E. M., Cheng, F. H., Long, K. S., Szkody, P., Gilliland, R. L., Huang, M., Hubeny, I., 1995, ApJ, 439, 957
    • Sion, E. M., Godon, P., Myzcka, J., Blair, W. P., 2010, ApJ Lett., 716, L157 Smith, D. A., Dhillon, V. S., 1998, MNRAS, 301, 767 Soker, N., Livio, M., Harpaz, A., 1984, MNRAS, 210, 189 Southworth, J., Clausen, J. V., 2007, A&A, 461, 1077 Southworth, J., Hickman, R. D. G., Marsh, T. R., Rebassa-Mansergas, A., Ga¨nsicke, B. T., Copperwheat, C. M., Rodr´ıguez-Gil, P., 2009, A&A, 507, 929
    • Southworth, J., Marsh, T. R., Ga¨nsicke, B. T., Steeghs, D., Copperwheat, C. M., 2010, A&A, 524, A86
    • Steele, I. A., et al., 2004, in J. M. Oschmann Jr., ed., Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 5489 of Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference, p. 679
    • Steinfadt, J. D. R., Bildsten, L., Howell, S. B., 2008, ApJ Lett., 677, L113 Steinfadt, J. D. R., Kaplan, D. L., Shporer, A., Bildsten, L., Howell, S. B., 2010, ApJ Lett., 716, L146
    • Taam, R. E., Sandquist, E. L., 2000, ARA&A, 38, 113 Tappert, C., Ga¨nsicke, B. T., Schmidtobreick, L., Aungwerojwit, A., Mennickent, R. E., Koester, D., 2007, A&A, 474, 205
    • Tappert, C., Ga¨nsicke, B. T., Schmidtobreick, L., Ribeiro, T., 2011, A&A, in press,arXiv:1107.3586 Taylor, J. H., Fowler, L. A., McCulloch, P. M., 1979, Nat, 277, 437 Webbink, R. F., 1990, in C. W. Mauche, ed., Accretion-Powered Compact Binaries, p. 177 Webbink, R. F., 2008, in E. F. Milone, D. A. Leahy, & D. W. Hobill, ed., Astrophysics and Space Science Library, vol. 352 of Astrophysics and Space Science Library, p. 233
    • Weber, E. J., Davis, Jr., L., 1967, ApJ, 148, 217 Werner, K., Herwig, F., 2006, PASP, 118, 183 Zorotovic, M., Schreiber, M. R., Ga¨nsicke, B. T., Nebot Go´mez-Mora´n, A., 2010, A&A, 520, A86+ Zorotovic, M., Schreiber, M. R., Ga¨nsicke, B. T., 2011, ArXiv eprints., 1108.4600 Zuckerman, B., Koester, D., Reid, I. N., Hu¨nsch, M., 2003, ApJ, 596, 477
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article