Central Bureau for Astronomical Telegrams
IAUC 4650: NSV 6708; 3C 446 AND 3C 279; VY Aqr; R CrB
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Read IAUC 4651
Circular No. 4650
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NSV 6708
W. A. Lawson, P. M. Kilmartin, A. C. Gilmore, and M. Clark,
Mount John Observatory, report a rapid decrease in the brightness
of the suspected R CrB star NSV 6708 (cf. IAUC 4233, 4560, etc.).
Preliminary photometry: Aug. 23.49 UT, V = 7.13, B-V = +0.48; Aug.
27.36, 7.17, +0.49; Sept. 2.40, 7.46, +0.50; Sept. 5.45, 7.81, +0.53.
3C 446 AND 3C 279
M. Kidger, Instituto de Astrofisica de Canarias, La Lugana;
and P. Allan, University of Manchester, telex: ''Examination
of CCD images of 3C 446 taken with the 1-m Jacobus Kapteyn
reflector (+ coated GEC chip) on Roque de Los Muchachos, La Palma,
in late July reveals that the light curve was then stable before
rising to the maximum reported by Perez (IAUC 4650): July 22.2 UT,
R = 16.32, B = 17.40; 23.2, 16.36, 17.27; 25.2, R = 16.37, V = 16.80,
B = 17.27. UBVRI photometry of 3C 279 appears to confirm the flare
observed by Webb (IAUC 4632): July 21.8, R = 12.90, V = 13.32, B =
13.80; July 22.8, I = 12.25, R = 12.84, V = 13.32, B = 13.84, U =
13.12; July 23.8, R = 12.30, V = 13.09, B = 13.53. These magnitudes
are in the Johnson/Kron-Cousins system."
VY AQUARII
Photoelectric photometry by R. Monella, Covo, Italy: Sept.
2.839 UT, V = 10.68, B-V = +0.35, U-B = -0.43; 3.876, 10.87, +0.46,
-0.29; 4.869, 10.93, +0.26, -0.41; 5.835, 11.12, +0.19, -0.35; 5.913,
11.21, +0.16, -0.36.
Corrigendum. On IAUC 4649, line 2, for Aug. 30.5 UT, [15 (A.
Pearce, Woodlands, W. Australia) read Aug. 30.38 UT, [15 (R. H.
McNaught, Siding Spring Observatory). The other observations attributed
to Pearce are correct.
R CORONAE BOREALIS
Photoelectric magnitudes (Geneva system) by J. Remis, J. C.
Misson, R. Lecocguen, J. Ortega, and M. Dumont, Versailles, France:
Aug. 4.89 UT, V = 9.39, B-V = -0.46, U-B = +0.89; 4.91, 9.40, -0.47,
+0.90; 6.87, 9.94, -0.52, +0.83; 13.85, 10.38, -0.16, +0.50.
Visual magnitude estimates by A. Pereira, Cabo da Roca, Portugal
(cf. IAUC 4645): Aug. 20.88 UT, 10.7; 22.87, 10.6; 24.87, 10.1;
25.87, 9.7; 26.92, 9.8; 28.90, 9.9; Sept. 3.84, 10.6; 4.88, 10.8.
1988 September 6 (4650) Daniel W. E. Green
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