Central Bureau for Astronomical Telegrams
IAUC 5782: 1993L; 1993J
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Circular No. 5782
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 1993L IN IC 5270
M. Della Valle and E. Cappellaro, European Southern Observatory,
report: "Analysis of a spectrogram (range 380-800 nm, resolution
about 1 nm), obtained with the New Technology Telescope at La
Silla on May 1.4 UT, shows this to be a type-Ia supernova. The
spectrum is dominated by absorption lines of Si II (635.5, 597.2,
564.0, 545.4, 412.9 nm). A preliminary measurement of the expansion
velocity deduced from the minimum of the Si II absorptions
yields about 16 000 +/- 500 km/s. Additional absorption of Mg II
(448.1 nm) is blueshifted by 13 000 km/s. The spectrum closely
resembles that of SN 1989B (Barbon et al. 1990, A.Ap. 237, 79) around
maximum."
N. Suntzeff, Cerro Tololo Interamerican Observatory, communicates:
"CCD spectrophotometry taken with the CTIO 1.5-m telescope
by V. Robledo-Rella on May 2.40 UT confirms that the bright object
reported by Evans is a supernova. The spectrum (range 380-590 nm,
resolution 1.5 nm) is very similar to a normal type-Ia supernova
such as SNe 1981B or 1990N about 10-14 days past maximum, based on
the absence of the S II lines at 530.0 nm (seen in normal pre-maximum
spectra) and the strengths of the Mg II, Fe II, and Na I features.
The red colors previously reported for the supernova are
consistent with a type-Ia supernova two weeks after maximum, and
are not necessarily indicative of high reddening."
D. Allen, Anglo-Australian Observatory; M. Burton and A. Walsh,
University of New South Wales; and G. Stringfellow, University of
California at Berkeley, report on near-infrared magnitudes of SN
1993L derived from images taken on May 1.79 UT with the IRIS camera
on the Anglo-Australian Telescope: "After spline-fitting the
underlying radiation from IC 5270, the magnitudes were J = 15.2, H =
13.7, Kn = 13.8. Kn is a narrow-band K filter covering 2.0-2.3
microns. The colors suggest a type-Ia supernova about 3 weeks
after maximum light."
SUPERNOVA 1993J IN NGC 3031
X. Zhou, Beijing Astronomical Observatory, reports that further
corrections are needed to the photometry published by Zheng et
al. on IAUC 5777, such that the following values must be added to
the U, B, V, R, and I magnitudes, respectively, to place the data
properly in the Johnson system: -0.06, -0.05, +0.04, -0.12, -0.21.
1993 May 3 (5782) Daniel W. E. Green
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