IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8465: 2004gw, 2005B, 2005D, 2005E, 2005F, 2005G

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 8464  SEARCH Read IAUC 8466

View IAUC 8465 in .dvi, .ps or .PDF format.
IAUC number


                                                  Circular No. 8465
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)


SUPERNOVAE 2004gw, 2005B, 2005D, 2005E, 2005F, 2005G
     Further to IAUC 8459, J. Graham and W. Li report the LOSS
discovery of three apparent supernovae on unfiltered KAIT images:

SN      2005 UT        R.A.  (2000.0)  Decl.    Mag.     Offset
2005E   Jan. 13.22    2 39 14.34  + 1 05 55.0   16.8   139" W, 19" N
2005F   Jan. 13.42    9 04 53.68  +13 33 56.3   17.7   52" E, 14" N
2005G   Jan. 14.60   13 44 32.79  + 4 46 44.3   16.5   13".4 W, 12".0 N

Additional unfiltered CCD magnitudes (KAIT unless otherwise noted):
SN 2005E in NGC 1032, 2004 Dec. 19.20, [19.0; 24.23, [18.0; 2005
Jan. 14.10, 16.8 (M. Schwartz, 0.8-m Tenagra II telescope); 14.20,
16.8.  SN 2005F in MCG +02-23-27, 2004 Dec. 17.43, [19.5; 2005 Jan.
13.91, 17.8 (O. Trondal, Oslo, Norway, 0.25-m telescope); 14.43,
17.8.  SN 2005G in UGC 8690, 2004 June 25.20 UT, [19.0; 2005 Jan.
15.56, 16.5.
     R. J. Foley and A. V. Filippenko, University of California,
Berkeley, report that inspection of CCD spectra (range 320-920 nm),
obtained on Jan. 15 UT with the Keck I 10-m telescope (+ LRIS),
reveals that SN 2005E is of type Ib/c, close to (or perhaps a few
days before) maximum brightness.  The presence of weak He I
absorption lines favors the type-Ib classification, although the
differences between type-Ib and -Ic supernovae can be difficult to
discern at early times.  SN 2005F is of type Ia, about 2.5 weeks
past maximum.  Adopting the NED redshift of 8545 km/s, the minimum
of the 635.5-nm Si II feature is at a velocity of 10700 km/s.  SN
2004gw (IAUC 8459) is probably of type Ia, 3-4 weeks past maximum
brightness, although it exhibits a number of spectral peculiarities
that render the classification uncertain.  SN 2005D (IAUC 8464) is
of type II, roughly a month after the explosion.  H_alpha has a
classic P-Cyg profile, and the other Balmer and Fe II lines are
strong.  Adopting the NED redshift of 8505 km/s, the ejecta
velocity measured from the H_alpha absorption minimum is unusually
large, about 13000 km/s.  Weak He I absorption lines are present,
suggesting that the object is specifically of type IIb; indeed, its
spectral characteristics are similar to those of the first-reported
spectrum of SN 2004ex (IAUC 8420), which eventually developed
prominent He I lines (IAUC 8446), although SN 2005D has stronger He
I absorption and a redder continuum, consistent with it being
somewhat older than SN 2004ex.
     Corrigendum.  On IAUC 8462, 'Supernova 2005B in UGC 11066',
line 9, *FOR*  SN 2005A  *READ*  SN 2005B

                      (C) Copyright 2005 CBAT
2005 January 15                (8465)            Daniel W. E. Green

Read IAUC 8464  SEARCH Read IAUC 8466

View IAUC 8465 in .dvi, .ps or .PDF format.


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!