Odessa Astronomical Publications (Apr 2017)

Negative superhumps and red noise in the cataclysmic binary TT Arietis: the international campaign "TT Ari-94"

  • I. L Andronov,
  • K. Arai,
  • L. L. Chinarova,
  • N. I. Dorokhov,
  • T. N. Dorokhova,
  • A. Dumitrescu,
  • D. Nogami,
  • S. V. Kolesnikov,
  • A. Lepardo,
  • P. A. Mason,
  • K. Matsumoto,
  • G. Oprescu,
  • G. Pajdosz,
  • R. Passuelo,
  • L. Patkos,
  • D. S. Senio,
  • G. Sostero,
  • V. F. Suleimanov,
  • J. Tremko,
  • G. V. Zhukov,
  • S. Zola

DOI
https://doi.org/10.18524/1810-4215.1997.10.98743
Journal volume & issue
Vol. 10, no. 0
pp. 10 – 14

Abstract

Read online

Results obtained during the international observational campaign ” Т Т Ari-94” are briefly discussed. During 258 hours, totally 51299 observations were obtained in 12 observatories. The moments of 68 individual maxima and 74 minima are tabulated. The linear ephemeris for the maximum is MachJD : 2449645.4255:і:0510003+(051133160і051000004) -Е for our data obtained in JD 2449 614-690. The period value is distinctly outside the interval 0511326 – 05113298 obtained for previous years. It still corresponds to the ’negative superhump’ state, whereas for a normal ’positive superhump’ the value predieted by Tremko et al. (1996, As.Ap. 312, 121) is P : 0.011426 105100006. The data prewhitened in respect to the superhump variations show the red noise power-law power spectrum with an index ”у : 1.3...2.6.