[IAUC] CBET 564: 20060627 : SUPERNOVA 2006dd IN NGC 1316

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                                                  Electronic Telegram No. 564
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 2006dd IN NGC 1316
     N. Morrell and G. Folatelli, Carnegie Supernova Project; R.
Barba, La Serena University; and J. Arias, La Plata University,
report that spectroscopy (wavelength range 342-960 nm) of SN 2006dd
(cf. IAUC 8723, CBET 554), obtained on June 21.42 UT with the
Magellan I 6.5-m telescope at Las Campanas Observatory, confirms the
type-Ia nature of the event (cf. CBET 557).  Adopting for the parent
galaxy a recession velocity of 1760 km/s (Longhetti et al. 1998,
A.Ap. Suppl. 130, 267), an expansion velocity of 11400 km/s is
obtained from the minimum of the Si II 635.5-nm absorption.  Through
the use of the supernova spectrum-comparison software 'superfit'
(Howell et al. 2005, Ap.J. 634, 1190), an approximate age of 4 days
before maximum light is derived, matching well the spectrum of SN
1994D at age -5 days.


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                         (C) Copyright 2006 CBAT
2006 June 27                     (CBET 564)               Daniel W. E. Green