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UBV observations of the flickering of T CrB

ATEL # 2586; R. Zamanov, S. Boeva, S. Tsvetkova, K.Stoyanov (Institute of Astronomy, Sofia, Bulgaria)
on 27 Apr 2010; 13:32 UT
Password Certification: R. K. Zamanov (rkz@astro.bas.bg)

Subjects: Optical, Binaries, Cataclysmic Variables, Stars

We observed the recurrent nova T Coronae Borealis simultaneously in three filters (UBV) using the telescopes of the National Astronomical Observatory Rozhen (Bulgaria). The 2m RCC telescope observed in U and V bands, and the 50/70 cm Schmidt telescope in B band. During the first run (JD 2454851.6) the total amplitude detected in U was about 0.4 mag and during the second (JD 2454889.5) - about 0.3 mag. In the table are given as follows: the band, UT-start and UT-end of the run, number of CCD images obtained, minimum, maximum and average magnitudes in each band, standard deviation of the mean, typical observational error.
date UTst-end Npts
min max average stdev / err
band h:mm-h:mm
[mag] [mag] [mag] [mag] / [mag]
20.01.2009 U
2:17-4:05 28
11.517 11.921 11.747 0.118 / 0.027
B
2:28-4:07 240
11.108 11.269 11.199 0.035 / 0.010
V
2:19-4:09 559
9.878 9.952 9.916 0.015 / 0.016
27.02.2009 U
0:11-1:37 24
12.162 12.465 12.330 0.089 / 0.028
B
0:15-1:43 24
11.438 11.521 11.482 0.021 / 0.005
V
0:10-1:40 490
10.138 10.191 10.168 0.009 / 0.012

We adopt extinction E(B-V)=0.15 (Selvelli, Cassatella & Gilmozzi, 1992, ApJ 393, 289). Following Bruch (1992, A&A 266, 237), we calculate the colours of the flickering source:
January 20 U-B = -0.50, B-V= +0.42
February 27 U-B = -0.56, B-V = +0.69 ; the error is 0.10 in U-B, and 0.15 in B-V.
The result confirm our resent findings (Zamanov et al. 2010, MNRAS 404, 381) that the colours of the flickering source of the symbiotic stars differ from those of the cataclysmic variables. The data are available upon request from the authors (www.astro.bas.bg/~rz/TCrB/).

Flickering of T CrB in UBV


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