Electronic Telegram No. 477
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2006bd IN UGC 6609
     N. Morrell, G. Folatelli, and C. Contreras, on behalf of the
Carnegie Supernova Project, report that a spectrogram (range
380-920 nm) of SN 2006bd (cf. IAUC 8693, CBET 448), obtained on
Mar. 30.02 UT with the Las Campanas 2.5-m du Pont telescope (+
WFCCD spectrograph), reveals it to be a subluminous type-Ia
supernova.  The spectrum matches very well that of SN 1991bg at
maximum light, as determined through use of the 'superfit'
supernova-spectrum-comparison software of Howell et al. (2005,
Ap.J. 634, 1190).  Photometric follow-up observations, performed
with the 1.0-m Swope telescope at Las Campanas, show a fast decline
-- consistent with the subluminous nature inferred from the
spectrum.  Adopting a recesion velocity of 7712 km/s from the NED
database (after Barton et al. 1998, A.J. 116, 1573), an expansion
velocity of 10800 km/s is derived from the absorption minimum of
the Si II 635.5-nm doublet.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2006 CBAT
2006 April 18                    (CBET 477)               Daniel W. E. Green