Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7721: 2001dj; 2001di, 2001dv, 2001ei,, 2001ej; 2001el

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 7720  SEARCH Read IAUC 7722

View IAUC 7721 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7721
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     A. V. Filippenko and R. Chornock, University of California at
Berkeley, report:  "Inspection of CCD spectra (range 330-1000 nm)
obtained on Sept. 20 UT with the Shane 3-m reflector at Lick
Observatory reveals that SN 2001dj (IAUC 7674) is indeed a
supernova, contrary to the report on IAUC 7680.  The bright star
located 56".6 east and 3".8 north of the supernova has an early-F
spectral type, so we suspect this is the star whose spectrum is
described on IAUC 7680.  The supernova is a peculiar type-II event
in the nebular phase, with strong, broad H-alpha emission having an
asymmetric profile (the line peaks at -5000 km/s, after removal of
the NED redshift); it also shows reasonably strong but somewhat
narrower He I emission lines.  He I emission lines at this phase
are very rare in type-II supernovae."

SUPERNOVAE 2001di, 2001dv, 2001ei, AND 2001ej
     Filippenko and Chornock add:  "Inspection of CCD spectra,
obtained as above on Sept. 20 UT, reveals that SN 2001dv (IAUC
7690) is of type II, perhaps a month after maximum brightness;
H-alpha emission dominates the spectrum.  SN 2001ei (IAUC 7718) is
a peculiar type-Ia event, about 3 weeks past maximum brightness,
spectroscopically very similar to the highly subluminous SN 1991bg
(Filippenko et al. 1992, A.J. 104, 1543); it even exhibits the
narrow Na I D absorption that was seen in SN 1991bg but not seen in
most other subluminous type-Ia supernovae.  SN 2001di (IAUC 7673)
is a type-II supernova beginning to enter the nebular phase;
H-alpha emission is very strong.  SN 2001ej (IAUC 7719) is a very
young type-Ib or -Ic supernova with a blue continuum and relatively
shallow absorption lines; further monitoring should facilitate a
definitive classification based on the presence or absence of He I
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2001ej, obtained by M. Calkins on Sept. 20.50 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ic supernova near maximum

SUPERNOVA 2001el IN NGC 1448
     Libert A. G. Monard (not Liebert, as given on IAUC 7720)
reports that SN 2001el has brightened to m_v = 13.7 on Sept. 20.114

                      (C) Copyright 2001 CBAT
2001 September 20              (7721)            Daniel W. E. Green

Read IAUC 7720  SEARCH Read IAUC 7722

View IAUC 7721 in .dvi or .ps format.

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

Valid HTML 4.01!