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TT ARI–94: A Study of 1.6…60 Minute Variability

Published online by Cambridge University Press:  12 April 2016

I. L. Andronov ,
K. Arai ,
L. L. Chinarova ,
N. I. Dorokhov ,
T. A. Dorokhov ,
A. Dumitrescu ,
D. Nogami ,
A. Lepardo ,
P. A. Mason  and
K. Matumoto
...Show all authors
I. L. Andronov
Affiliation:
Department of Astronomy, Odessa State University, T.G.Shevchenko Park, 270014 Odessa, Ukraine
K. Arai
Affiliation:
Kuki–Hokuyo Senior High School, Kuki Saitama, 346Japan
L. L. Chinarova
Affiliation:
Department of Astronomy, Odessa State University, T.G.Shevchenko Park, 270014 Odessa, Ukraine
N. I. Dorokhov
Affiliation:
Department of Astronomy, Odessa State University, T.G.Shevchenko Park, 270014 Odessa, Ukraine
T. A. Dorokhov
Affiliation:
Department of Astronomy, Odessa State University, T.G.Shevchenko Park, 270014 Odessa, Ukraine
A. Dumitrescu
Affiliation:
Astronomical Institute of the Romanian Academy75212 Bucharest 28, Romania
D. Nogami
Affiliation:
Department of Astronomy, Faculty of Science, Kyoto University, Oiwake–cho, Kitashirakawa Sakyo–ku, Kyoto 606–01, Japan
A. Lepardo
Affiliation:
Stazione Astronomica, 33047 Remanzacco (ud), via S.Stefano 31, Italy
P. A. Mason
Affiliation:
Case Western Reserve University, Department of Astronomy, Cleveland, OH 44106, USA
K. Matumoto
Affiliation:
Osaka Kyoiku University, B4–212, 698–1, asahigoaka chome kashiwara–shi, Osaka 582, Japan
G. Oprescu
Affiliation:
Astronomical Institute of the Romanian Academy75212 Bucharest 28, Romania
G. Pajdosz
Affiliation:
Mt. Suhora Observatory, Pedagogical University, ul.Podchorązych 2, 30–084 Kraków, Poland
R. Passuelo
Affiliation:
Stazione Astronomica, 33047 Remanzacco (ud), via S.Stefano 31, Italy
L. Patkos
Affiliation:
Konkoly Observatory, P.O. Box 67, 1525 Budapest, Hungary
G. Sostero
Affiliation:
Stazione Astronomica, 33047 Remanzacco (ud), via S.Stefano 31, Italy
J. Tremko
Affiliation:
Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranska Lomnica, Slovakia
S. Zola
Affiliation:
Mt. Suhora Observatory, Pedagogical University, ul.Podchorązych 2, 30–084 Kraków, Poland Astronomical Observatory, Jagiellonian Universityul.Orla 171, 30–244 Kraków, Poland

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We report photometric results from 44 runs at 11 observatories during the international campaign ‘TT Ari–94’. No coherent oscillations in the frequency range 10… 900 cycle d−1 are found. The highest peaks in the power spectrum cover the wide range of 28… 139 cycle d−1. Variations occur at a few preferred time-scales rather than at one cycle length, with a possible secular decrease. In the frequency range 90… 900 cycle d−1 the power spectrum obeys a power law with slope γ ranging from 0.8 to 2.6 for different runs.

TT Ari is one of the brightest cataclysmic variables and remains one of the most interesting objects of this class. It exhibits a variety of phenomena observed at time-scales from seconds to months. A recent detailed photometric study of this object and a bibliographical overview may be found in Tremko et al. (1996). Tremko et al. (1992, 1993, 1994) discuss aspects of the TT Ari–88 campaign. Our campaign TT Ari–94 was unprecedented, as the observations were longitude-dispersed, from Japan through Turkmenia, to Europe and the American continent. Moreover, our optical data on October 7 partially overlap with the HST observations obtained by Home & Welsh (1995, private communication). The numerical results of observations obtained during these nights are shown in Table 1.

Type
Non-Magnetic Cataclysmic Variables
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 37 - 40
Copyright
Copyright © Kluwer 1996

References

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