Central Bureau for Astronomical Telegrams
IAUC 7216: 1999cw; 1999cz; V382 Vel
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Circular No. 7216
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999cw IN MCG -01-02-001
L. Rizzi, Universita di Padova; F. Patat, European Southern
Observatory (ESO); S. Benetti, Telescopio Nazionale Galileo; and E.
Cappellaro and M. Turatto, Osservatorio Astronomico di Padova,
write: "V. Ripepi and M. Marconi (Osservatorio di Capodimonte) have
observed SN 1999cw with the Danish 1.5-m telescope (+ DFOSC; 17-min
exposure, range 500-970 nm, resolution 1.0 nm) on July 1.39 UT at
La Silla. A full reduction of the CCD spectrogram shows this
object (IAUC 7211) to be a type-Ia supernova around maximum light.
The spectrum is dominated by P-Cyg profiles superimposed on a blue
continuum, with the Si II 635.5-nm line particularly weak, similar
to the peculiar type-Ia SN 1991T. The expansion velocity deduced
from the minimum of the Si II line is 11 000 km/s, which is
consistent with SN 1991T at a similar epoch. The parent galaxy's
recession velocity is 3725 +/- 39 km/s (Huchra et al. 1993, A.J.
105, 1637)."
SUPERNOVA 1999cz IN NGC 5078
Rizzi et al. also report: "E. Pompei has observed SN 1999cz
with the ESO-Danish 1.54-m telescope (+ DFOSC) on July 6.08 UT at
La Silla. A full reduction of the CCD spectrogram (range 400-900
nm, resolution 1.0 nm) shows that this object (IAUC 7214) is indeed
a supernova. Weak Si II (635.5 nm), very-well-developed P-Cyg
profiles, and a rather red continuum are consistent with a type-Ic
supernova, 3-4 weeks after maximum light. The spectrum
(http://sc6.sc.eso.org/~lrizzi/sn99cz_spec.gif) is similar to that
of SN 1997B (ESO database, unpublished) at 1 month past maximum,
even if the near-infrared Ca triplet is much fainter in SN 1999cz.
The most prominent features are identified as Si II, Ca II, Na I D,
and Fe II. The expansion velocities, deduced from the minima of Si
II 635.5-nm and Na I D, are 6900 and 9200 km/s, respectively. The
spectrum appears to be heavily reddened. A very strong, unresolved
absorption feature (EW = 0.58 nm) is visible at the parent galaxy
rest-frame wavelength of Na I D. This is consistent with the
position of the supernova, which appears to be projected just above
the dust lane of NGC 5078."
V382 VELORUM
Photometry of V382 Vel by P. M. Kilmartin at Mount John
(reference star HD 92518; cf. IAUC 7196, 7209): June 26.341 UT, V
= 7.30, U-B = -0.80, B-V = -0.14, V-R = +1.46, V-I = +0.90; 28.351,
7.35, -0.94, -0.14, +1.44, +0.86; July 4.382, 7.46, -0.94, -0.14,
+1.41, +0.77.
(C) Copyright 1999 CBAT
1999 July 6 (7216) Daniel W. E. Green
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