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IAUC 5760: 1993J

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                                                  Circular No. 5760
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
     A. V. Filippenko and T. Matheson, University of California,
Berkeley, report:  "We obtained spectra (range 300-1000 nm, resolution
0.5 nm) of SN 1993J on Apr. 13 UT with the Shane 3-m reflector
at Lick Observatory.  Well-developed P-Cyg profiles are visible in
the hydrogen Balmer lines, Fe II, Na D, Mg II, and Ca II.  A component
of moderate width (FWHM = 3.4 nm) is superposed on the broad
H-alpha emission (FWHM = 29 nm).  The narrow emission lines of He
II 468.6 nm, [Fe X] 637.4 nm, and H-alpha previously noted on IAUC
5740 are now gone; the ionized circumstellar gas that produced them
has now presumably been overcome by the supernova ejecta.  This may
be consistent with the appearance of radio and x-ray emission.  The
narrow absorption line at 373.45 nm, tentatively identified as Al
II on IAUC 5740, is not visible; either it was an artifact, or it
was produced by the circumstellar gas."
     S. Odewahn, University of Minnesota; C. E. Woodward, University
of Wyoming; and J. Bailey, Agnes Scott College, report the
following infrared magnitudes of SN 1993J, obtained with the 1.3-m
KPNO telescope (+ SQIID imager):  Apr. 1.21 UT, J = 10.54 +/- 0.02,
H = 10.47 +/- 0.02, K = 10.37 +/- 0.02; Apr. 2.31, 10.62 +/- 0.01,
10.49 +/- 0.01, 10.33 +/- 0.01.  Photometric magnitudes for the
reference stars in the supernova field are as follows:  GSC
4383.0565, J = 10.36 +/- 0.01, H = 10.14 +/- 0.01, K = 10.09 +/-
0.01; GSC 4383.0928, 10.85 +/- 0.01, 10.63 +/- 0.01, 10.57 +/-
0.02; GSC 4383.0340, 13.32 +/- 0.05, 13.12 +/- 0.05, 13.03 +/- 0.05.
     Further photoelectric photometry (cf. IAUC 5750, 5755, 5758)
by D. Hanzl, N. Copernicus Planetarium, Brno (H); by T. Kato, Kyoto
University (K); by M. Okyudo and T. Ishida, Nishi-Harima Observatory
(OI); by M. Mikolajewski and K. Ruminski, N. Copernicus University,
Torun (MR); by R. Mutel and P. Sauerbrei, University of Iowa
(MS); and by P. Prugniel, Observatoire de Haute Provence (P):  Apr.
8.576 UT, V = 11.68 (OI); 9.541, V = 11.46 (K); 9.659, V = 11.52
(OI); 10.14, B = 11.81 +/- 0.06, V = 11.42 +/- 0.06, R = 10.81 +/-
0.05, I = 10.70 +/- 0.10 (MS); 10.588, V = 11.46 (OI); 10.91, V =
11.08 +/- 0.08, B-V = +0.53 +/- 0.10 (H); 10.92, V = 11.26 +/-
0.01, U-B = -0.17 +/- 0.03, B-V = +0.46 +/- 0.01, V-R = +0.51 +/-
0.01, V-I = +0.36 +/- 0.02 (MR); 12.00, Bc = 11.85, Bc-Rc = +0.83
(P); 12.476, V = 11.11 (K); 12.499, Ic = 10.71 (K); 12.537, B =
11.57 (K).


1993 April 13                  (5760)            Daniel W. E. Green

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