Central Bureau for Astronomical Telegrams
IAUC 8019: 2002ib; 2002ic; 2002hy
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Circular No. 8019
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2002ib
Further to IAUC 7995, W. M. Wood-Vasey et al. report the
discovery of an apparent supernova (mag 19.8) on unfiltered NEAT
images taken with the Palomar 1.2-m Schmidt telescope on Oct.
31.19, 31.21, and 31.23 UT. Confirming NEAT images were taken on
Nov. 12 (at mag 18.2), 13 (mag 18.1), and 19 (mag 18.3). The new
object is located at R.A. = 0h54m07s.45, Decl. = +17o33'53".7
(equinox 2000.0), which is 1" east of the center of the apparent
host galaxy. No point source is visible at this location in
previous NEAT Palomar images taken on Oct. 3 (limiting mag 21.2 at
S/N = 3).
SUPERNOVA 2002ic
Wood-Vasey et al. also report the discovery of another
apparent supernova (mag 18.5) on unfiltered NEAT images taken on
Nov. 13 UT. Confirming NEAT observations were made on Nov. 20 (mag
17.8). SN 2002ic is located at R.A. = 1h30m02s.55, Decl. =
+21o53'06".9 (equinox 2000.0), which is 3".6 west of the center of
the apparent host galaxy. No point source is visible at this
location in previous NEAT Haleakala images taken on Oct. 30
(limiting mag 20.0 at S/N = 3).
SUPERNOVA 2002hy IN NGC 3464
S. Benetti, G. Altavilla, A. Pastorello, M. Riello, M.
Turatto, and L. Zampieri, Osservatorio Astronomico di Padova; and
E. Cappellaro, Osservatorio Astronomico di Capodimonte, on behalf
of the ERTN (cf. IAUC 7987), report that a fully reduced CCD
spectrum (range 333-1000 nm, resolution 1.2 nm) of SN 2002hy (cf.
IAUC 8016), obtained on Nov. 15.33 UT with the European Southern
Observatory 3.6-m telescope (+ EFOSC2), shows it to be a peculiar
type-Ib supernova caught soon after explosion. The spectrum is
dominated by a blue continuum [T_bb about 11500 K, once dereddened
by E(B-V) about 0.17, as calculated from the equivalent width of
the Na I D interstellar band] with overimposed He I lines (at
388.9, 447.1, 501.5, 587.5, 667.8, and 706.5 nm) and their P-Cyg
profiles. From the He I 587.5-nm minimum, an expansion velocity of
about 9500 km/s is derived. The peaks of the He I emission lines
are blueshifted by about 1800 km/s. Narrow absorptions identified
with H-alpha and H-beta are detected at 629.1 and 468.6 nm,
respectively, from which an expansion velocity of about 16000 km/s
is deduced for H-alpha.
(C) Copyright 2002 CBAT
2002 November 20 (8019) Daniel W. E. Green
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