Central Bureau for Astronomical Telegrams
IAUC 6537: 1997D; 1997B; 1997C
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Circular No. 6537
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 1997D IN NGC 1536
Duilia de Mello, Observatorio Nacional, Rio de Janeiro,
reports her discovery of a supernova on Jan. 14.15 UT with the
European Southern Observatory (ESO) 1.52-m telescope at La Silla;
SN 1997D is located 11" east and 43" south of the nucleus of NGC
1536 (R.A. = 4h11m.0, Decl. = -56o29', equinox 2000.0). S. Benetti,
ESO, writes: "Inspection of a fully-reduced spectrum (range 369.5-
757.8 nm, resolution about 0.6 nm), obtained on Jan. 14.15 with the
ESO 1.52-m telescope (+ Boller & Chivens spectrograph) by the
discoverer, confirms SN 1997D to be a peculiar type-II supernova,
about 100 days after maximum. The spectrum contains a variety of
lines superimposed on a red continuum. H-alpha shows an
unusual double-P-Cyg profile, from which expansion velocities of
about 5000 and 1200 km/s are derived (the redshift of the galaxy
being 1296 km/s). A line with P-Cyg profile (peak measured at
663.3 nm and minimum at 661.5 nm) is visible on the H-alpha red
wing. The Na I-D doublet is present with a P-Cyg profile
(expansion velocity of about 3700 km/s), together with a strong P-
Cyg line of Ba II 614.2-nm (expansion velocity about 2200 km/s) and
P-Cyg lines of Sc II at 552.7, 565.8, and 624.5 nm (expansion
velocity of about 1800 km/s). Emission lines of Fe II at 492.4,
501.8, and 516.9 nm are present in the supernova spectrum. A
relatively strong emission line at 734.3 nm has been identified
with the Ca II] 729.1-732.3-nm doublet. H-beta is very weak if
present at all." An R image obtained by G. Massone (Osservatorio
di Torino) with the 0.9-m Dutch telescope on Jan. 15.05 yields a
supernova magnitude of 16.3.
SUPERNOVA 1997B IN IC 438
M. Cavagna, Sormano, Italy, reports the following precise
position of SN 1997B from observations by P. Sicoli and V. Giuliani
with the 0.5-m reflector + CCD on Jan. 14.844 UT: R.A. =
5h53m01s.95, Decl. = -17o51'55".7 (equinox 2000.0).
SUPERNOVA 1997C IN NGC 3160
W.-d. Li, Beijing Astronomical Observatory (BAO), reports
that the time of the spectrogram reported on IAUC 6536 was Jan.
14.7 UT. Additional prediscovery observations of SN 1997C have
been identified in the BAO data, with the following unfiltered CCD
magnitudes available: 1996 Dec. 23 UT, 17.8; 27, 17.3.
(C) Copyright 1997 CBAT
1997 January 15 (6537) Daniel W. E. Green
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