Central Bureau for Astronomical Telegrams
IAUC 8493: 2005ar; 2005as; 2005aj
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Circular No. 8493
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2005ar
Further to IAUC 8492, J. Graham and W. Li report the LOSS
discovery of an apparent supernova on unfiltered KAIT images. The
new object is located at R.A. = 11h15m19s.03, Decl. = -3o46'18".5
(equinox 2000.0), which is 4".6 east and 5".6 north of the center
of the apparent host galaxy. Available approximate magnitudes for
SN 2005ar: Jan. 20.35 UT, [20.0; Feb. 10.35, [18.5; Mar. 10.37,
17.7; 11.36, 17.6.
M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics; and T. Matheson, National Optical
Astronomy Observatory, report that a spectrum (range 350-740 nm) of
SN 2005ar, obtained by J. Foster on Mar. 11.31 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), reveals it to be a
type-Ib supernova. The spectrum is very similar to spectra of SN
1998dt (Matheson et al. 2001, A.J. 121, 1648), around one week
after maximum brightness, and exhibits He I (rest 587.6 nm) in
absorption; however, the other He I lines (rest 667.8, 706.5 nm)
are weak. Further spectroscopy is encouraged to check and monitor
the evolution of the He I lines.
SUPERNOVA 2005as IN NGC 3450
Graham and Li also report the LOSS discovery of another
supernova on unfiltered KAIT images. SN 2005as is located at R.A.
= 10h48m03s.52, Decl. = -20o50'56".5 (equinox 2000.0), which is
only 0".8 north of the center of NGC 3450. Approximate magnitudes
for the new object: 2004 Dec. 17.35 UT, [19.5; 2005 Jan. 14.34,
[18.0; 21.35, 17.1; Feb. 2.36, 15.9; Mar. 7.31, 17.2. A. V.
Filippenko and R. J. Foley, University of California, Berkeley,
report that inspection of CCD spectra (range 320-930 nm), obtained
on Mar. 11 with the Keck I 10-m telescope (+ LRIS), shows that this
supernova is of type Ia, perhaps six weeks past maximum brightness
(but severe contamination by host-galaxy light makes this estimate
uncertain).
SUPERNOVA 2005aj IN UGC 2411
Filippenko and Foley add that inspection of CCD spectra,
obtained as above, shows that SN 2005aj (cf. IAUC 8488) is of type
Ic. The O I 777.4-nm and Ca II near-infrared triplet absorption
troughs are very strong. Prominent Na I D absorption produced by
Galactic gas (0.17-nm equivalent width) and host-galaxy gas (0.11-
nm equivalent width) are qualitatively consistent with the observed
red continuum.
(C) Copyright 2005 CBAT
2005 March 12 (8493) Daniel W. E. Green
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