[vsnet-campaign 1713] TT Ari: Recent Bright Maxima

[Ivan Andronov]

TT Ari: Recent Bright Maxima

The observations were obtained using the telescope of Tzec Maun Observatory (USA):
Telescope: Ritchey-Chretien 16" + SBIG STL-6303
Filters: VR
Exposure: 120 s

on January 12 and 13, 2010. The light curves are shown at
http://uavso.pochta.ru/TT_Ari100112.gif
and 
http://uavso.pochta.ru/TT_Ari100113.gif 
They show variations in a range of
16.09-16.62 (V), 15.82-16.49 (R) on January 12, 2010
and
14.66-16.52 (V), 14.64-16.25 (R) on January 13, 2010

The reference star was N (according to Goetz, IBVS 2823, http://cdsads.u-strasbg.fr/abs/1985IBVS.2823....1G ), R=14.231, V=14.633.

Although the minimum brightness for the later night has increased by only 0.10 mag in V and 0.24 mag in R, 
the maximum brightness has increased at much larger value: 
by 1.43 mag (V) and  1.18 mag (R). The comparison of the two nights shows that the first night was more "quite", with some fluctuations at a time scale of ~30 minutes, which was more pronounced in V than in R. The outburst-like feature occurred with a maximum at HJD 2455208.6445+-0.0007, but it was not as prominent, as prominent outbursts observed during the second night. The first one was decaying at the beginning of the night. The time interval between the ascending branches of two other ones is 0.125+-0.001d. This value is smaller (but comparable to) than the negative superhump period at the high state 0.13316(cf. Andronov et al., http://cdsads.u-strasbg.fr/abs/1999AJ....117..574A ).


Natalia Virnina
Department "High and Applied Mathematics"
Odessa National Maritime University
Odessa, Ukraine;
Institute of Mathematics, Economy and Mechanics
Odessa National University

VSNET observer's code VIR
AAVSO code VNA



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