[IAUC] CBET 1325: 20080403 : SUPERNOVA 2008bo IN NGC 6643

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                                                  Electronic Telegram No. 1325
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2008bo IN NGC 6643
     H. Navasardyan, S. Benetti, A. Harutyunyan, I. Agnoletto, F. Bufano,
and E. Cappellaro, Istituto Nazionale di Astrofisica (INAF), Padova; and M.
Turatto, INAF, Catania, report that a spectrogram (range 360-780 nm,
resolution 2.4 nm) of 2008bo (cf. CBET 1324), obtained on Apr. 3.12 UT
with the Ekar-Copernicus 1.82-m telescope (+ AFOSC), shows it to be a
stripped-envelope supernova.  The spectrum is dominated by a very deep H-alpha
absorption, from which an expansion velocity of about 12300 km/s is derived,
assuming a recession velocity of 1483 km/s (Davis and Seaquist 1983, Ap.J.
Suppl. 53, 269; via LEDA) for the host galaxy.  The spectrum shows also
intense Fe II lines.  The 'PASSparToo' spectrum-comparison code (Harutyunyan
et al. 2005, ASP Conf. Ser. 342, 258) provides good fits to SN 2008ax about a
week after discovery.  SN 2008ax was first classified as a peculiar type-II
(CBET 1285) or type-IIb (CBET 1298) supernova but, about a week later, its
spectra were more resembling those of a type-Ib supernova (CBETs 1305, 1309).


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                         (C) Copyright 2008 CBAT
2008 April 3                     (CBET 1325)              Daniel W. E. Green