Central Bureau for Astronomical Telegrams

IAUC 5777: 1993J; N Oph 1993

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                                                  Circular No. 5777
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1993J IN NGC 3031
     J. Y. Hu, Z. W. Li, X. J. Jiang, and L. F. Wang, Beijing
Observatory, e-mail:  "Low-resolution spectra (0.53 nm/pixel) of SN
1993J obtained at the Beijing Astronomical Observatory's 2.16-m
telescope show conspicuous changes in the P-Cyg profiles of H-alpha
and Na I 589.3-nm.  From Apr. 22 to 26, the shapes of the bottoms
of the absorption troughs have changed to sharp triangle-like features
from their original flat bottom structure.  Higher-resolution
spectra (0.13 nm/pixel) show that the absorption trough of the Na
589.3-nm line consists of two components that differ in velocity by
about 3000 km/s, of which the bluer one has not changed very much,
while the redder component has been evolving rapidly since Apr. 22
and is much stronger than the bluer component as of Apr. 26.  The
H-alpha line shows very similar changes.  The depletion of the Na
589.3-nm line is about 50 percent, and that of H-alpha is about 60
percent.  These changes in the line profiles may be due to a change
in the optical properties of the atmosphere surrounding the
supernova's photosphere, suggesting perhaps an asymmetric explosion."
     Z.-Y. Zheng, X. Zhou, and H. Wu, Beijing Astronomical Observatory,
provide the following data as a total replacement for their
erroneous photometry published on IAUC 5774 (the revised reduction
was performed using the data from Corwin on IAUC 5742; internal
errors about +/- 0.02):  Apr. 7.56 UT, U = 11.81, B = 12.15, V =
11.66, R = 11.30, I = 11.14; 9.61, 11.77, 12.05, 11.39, 11.07,
10.92; 10.58, 11.69, 11.82, 11.27, 10.97, 10.84; 11.59, 11.54,
11.75, 11.17, 10.81, 10.74; 12.64, 11.47, 11.68, 11.06, 10.73,
10.66; 13.61, 11.39, 11.56, 11.02, 10.69, 10.59; 14.62, 11.37,
11.51, 10.92, 10.57, 10.49; 15.59, 11.39, 11.48, 10.86, 10.55,
10.46; 16.55, 11.35, 11.49, 10.79, 10.50, 10.42; 17.55, 11.39,
11.42, 10.84, 10.48, 10.39; 18.57, 11.43, 11.51, 10.81, 10.48,
10.39; 19.58, 11.56, 11.55, 10.82, 10.46, 10.38; 20.55, 11.69,
11.67, 10.86, 10.49, 10.35; 21.56, 11.85, 11.83, 10.91, 10.52,
10.40; 23.56, 12.29, 12.07, 11.06, 10.60, 10.48; 24.56, 12.57,
12.29, 11.15, 10.66, 10.53; 25.56, 12.81, 12.51, 11.28, 10.76,
10.59; 26.54, 13.04, 12.63, 11.30, 10.79, 10.60; 29.54, 13.60,
12.90, 11.57, 10.99, 10.80.


NOVA OPHIUCHI 1993
     Visual magnitude estimates:  Apr. 25.81 UT, 9.8 (P. Camilleri,
Cobram, Vic., Australia); 26.45, 10.8 (R. Royer, Lakewood, CA);
27.05, 11.6 (A. Mizser, Budapest, Hungary); 29.40, 11.9 (Royer).


1993 April 30                  (5777)            Daniel W. E. Green

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