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The 1985 Superoutburst of U Geminorum. Detection of Superhumps

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Wybrane pełne teksty z tego czasopisma
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Superhumps are detected in the AAVSO light curve of the 1985 superoutbursts of U Gem. They appeared not later than 2-3 days after reaching maximum and disappeared not later than about 4 days before the final decline. The superhump period was Psh≈0.20 d and increased at a rate of dP/dt≈2×10-4. The corresponding superhump period excess was ε=0.130±0.014. The full amplitude of the superhumps was 2A≈0.3 mag. During the last ten days of the superoutburst additional periodic variations were also present. Their period was ≈0.18 d and their full amplitude grew from 2A≈0.2 mag to ≈0.5 mag. U Gem, together with the permanent superhumper TV Col (Retter et al. 2003), form a challenge to the theory which is unable to explain superoutburst and superhumps in systems with long orbital periods and mass ratios q>qcrit=1/3. Another challenge to the theory comes from a comparison of the theoretical ε-q relation resulting from numerical simulations (Murray 2000) with its observational counterpart: for q>0.15 the model values of ε are systematically - by a factor of 2 - too large.
Czasopismo
Rocznik
Strony
433--442
Opis fizyczny
Bibliogr. 19 poz., tab., wykr.
Twórcy
autor
  • N. Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
autor
  • American Association of Variable Star Observers, 25 Birch Street, Cambridge, MA 02138, USA
Bibliografia
  • Cannizzo, J.K., Gehrels, N., and Mattei, J.A. 2002, Astrophys. J., 579, 760.
  • Hellier, C. 1993, MNRAS, 264, 132.
  • Hirose, M., and Osaki, Y. 1990, Publ. Astr. Soc. Japan, 42, 135.
  • Kuulkers, E. 1999, “Disk Instabilities in Close Binary Systems”, Eds. S. Mineshige, J.C. Wheeler, Tokyo: Universal Academy Press, p. 169.
  • Mason, K.O., Córdova, F.A.,Watson, M.G., and King, A.R. 1988, MNRAS, 232, 779.
  • Mattei, J.A., Waagen, E.O., and Foster, F.G. 1991, AAVSO Monograph, No.2, Supplement No.1.
  • Mennickent, R.E. 1995, Astron. Astrophys., 294, 126.
  • Murray, J.R. 2000, MNRAS, 314, L1.
  • Murray, J.R., Warner, B., and Wickramasinghe, D. 2000, New Astronomy Reviews, 44, 51.
  • O’Donoghue D. 2000, New Astronomy Reviews, 44, 45.
  • Osaki, Y. 1996, P.A.S.P., 108, 39.
  • Patterson, J. 2001, P.A.S.P., 113, 736.
  • Patterson, J., et al. 2003, P.A.S.P., 115, 1308.
  • Retter, A., and Hellier, C. 2000, New Astronomy Reviews, 44, 35.
  • Retter, A., Hellier, C., Augusteijn, T., Naylor, T., Bedding, T.R., Bembrick, C., McCormick, J., and Velthuis, F. 2003, MNRAS, 340, 679.
  • Smak, J. 2000, New Astronomy Reviews, 44, 171.
  • Smak, J. 2001, Acta Astron., 51, 279.
  • Warner, B. 1995, “Cataclysmic Variable Stars”, Cambridge University Press.
  • Whitehurst, R. 1988, MNRAS, 232, 35.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-697f61a2-0155-4700-8e61-f00f64f347c4
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