[IAUC] CBET 458: 20060403 : SUPERNOVA 2006ba IN NGC 2980

[IAUC mailing list]

                                                  Electronic Telegram No. 458
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVA 2006ba IN NGC 2980
     S. Blondin, M. Modjaz, R. Kirshner, and P. Challis,
Harvard-Smithsonian Center for Astrophysics, report that a spectrum
(range 350-740 nm) of SN 2006ba (cf. CBET 443, IAUC 8693), obtained
on Apr. 2.26 UT by V. Antoniou with the F. L. Whipple Observatory
1.5-m telescope (+ FAST), shows it to be a type-IIb supernova.  The
spectrum is dominated by broad P-Cyg profiles of He I and of the
Balmer series.  Cross-correlation with a library of supernova spectra
indicates that SN 2006ba is similar to SN 1993J at 34 days past
explosion (Matheson et al. 2000, A.J. 120, 1487); a comparison of
spectra can be seen at http://cfa-www.harvard.edu/oir/Research/
supernova/spectra/sn2006ba_vs_sn1993J.gif.  Adopting a recession
velocity of 5736 km/s for the host galaxy (Mathewson and Ford 1996,
Ap.J. Suppl. 107, 97), the maximum absorption in the H_alpha line
(rest 656.3 nm) is blueshifted by 13000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 April 3                     (CBET 458)               Daniel W. E. Green