[vsnet-alert 11805] TT Ari: brighter and less variable

[Ivan Andronov]

TT Ari: brighter and less variable

Tonight observations with V and R filters shows that TT Ari is still
bright. The color index is rather small with low variations ( 0.09 -
0.32m), which indicates that the system became much hotter.

Contrary to ~2mag variations at the low state ~15-17, 
at this intermediate state, the amplitude is small ~0.3mag 
with a characteristic time scale of 1 hour, intermediate between 
the 15-25 min quasi-periodic oscillations at a negative superhump state 
and the positive (205 minutes) (or negative, 191 minute) superhumps
(cf. 2009A&A...496..765K, 1999AJ....117..574A et al). 


JD                   mag(R) code
2455227.55539 13.38    VIR
2455227.56090 13.41    VIR
2455227.56478 13.45    VIR
2455227.56866 13.53    VIR
2455227.57254 13.50    VIR
2455227.57641 13.36    VIR
2455227.58027 13.34    VIR
2455227.58414 13.24    VIR
2455227.58799 13.28    VIR
2455227.59187 13.14    VIR
2455227.59572 13.20    VIR
2455227.60553 13.37    VIR
2455227.61349 13.50    VIR
2455227.62176 13.68    VIR

JD                   mag(V) code
2455227.55902 13.73    VIR
2455227.56289 13.59    VIR
2455227.56676 13.70    VIR
2455227.57066 13.75    VIR
2455227.57452 13.65    VIR
2455227.57838 13.52    VIR
2455227.58224 13.39    VIR
2455227.58611 13.54    VIR
2455227.58996 13.39    VIR
2455227.60360 13.52    VIR
2455227.61107 13.58    VIR

Natalia Virnina & Odessa National Maritime University's working group

Department "High and Applied Mathematics"
Odessa National Maritime University
Odessa, Ukraine