Central Bureau for Astronomical Telegrams
IAUC 6682: 1997cr; C/1995 O1; N Sco 1997
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Circular No. 6682
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1997cr IN ANONYMOUS GALAXY
M. Turatto and S. Benetti, European Southern Observatory; and
E. Cappellaro and A. Piemonte, Padova, report: "A low-resolution
spectrogram (range 500-900 nm, resolution 1.2 nm) of SN 1997cr
(IAUC 6679) was obtained under poor conditions on June 14.42 UT at
the Danish 1.5-m telescope (+ DFOSC) at La Silla. The low-signal-
to-noise spectrum shows a blue continuum and only one broad (FWHM
about 25 nm) emission centered at 707 nm, with no P-Cyg absorption.
When this feature is identified with H-alpha, the spectrum matches
that of the bright linear type-II SN 1980K around maximum and
implies a redshift z = 0.077 for the parent galaxy. The absolute
magnitude (M_V >/= -17, H = 75 km sE-1 MpcE-1; cf. IAUC 6679) is
consistent with classification of SN 1997cr as type II. It must be
noted, however, that if this interpretation is correct, the parent
galaxy does not belong to Abell 3744 itself, but rather to one of
the background galaxies detected in the survey by Katgert et al.
(1996, A.Ap. 310, 8)."
COMET C/1995 O1 (HALE-BOPP)
N. Dello Russo, M. J. Mumma, and M. A. DiSanti, Goddard Space
Flight Center, NASA; K. Magee-Sauer, Rowan University; R. Novak,
Iona College; and T. Rettig, University of Notre Dame, report: "We
detected infrared emission from OCS and CN in C/1995 O1, using the
NASA Infrared Telescope Facility (+ CSHELL cryogenic infrared
spectrometer) on Mauna Kea. Lines (P3, P10, and R3) of the CN 1-0
vibrational band were detected on seven occasions during the
interval Mar. 1.9-May 1.2 UT. Nine lines (P10 to P24) of the OCS
nu_3 vibrational band were detected near 4.86 microns. For a
rotational temperature of 100 K, the production rate (x 10E27
molecules/s) of OCS was 3.4 on Apr. 16.2, and 3.2 on Apr. 30.1 and
May 1.2. The water-production rate was 5 x 10E30, based on our
measurements of lines of the hot band (100-010). The mixing ratio
is then Q(OCS)/Q(H_2O) = 7 x 10E-4. The OCS lines were sharply
peaked on the nucleus, while the CN lines were extended over the
length of the slit (+/- 15" about the nucleus), as expected."
NOVA SCORPII 1997
Visual magnitude estimates: June 10.20 UT, 10.4 (W. G. Dillon,
Missouri City, TX); 12.10, 11.7 (A. Pereira, Cabo da Roca,
Portugal); 14.99, 11.2 (F. Pujol, Madrid, Spain); 14.99, 11.3 (D.
Rodriguez, Madrid, Spain).
(C) Copyright 1997 CBAT
1997 June 19 (6682) Daniel W. E. Green
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