[IAUC] CBET 796: 20070106 : SUPERNOVA 2007A IN NGC 105

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                                                  Electronic Telegram No. 796
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 2007A IN NGC 105
     F. Olivares and M. Hamuy, University of Chile; and N. Morrell,
Las Campanas Observatory, on behalf of the Carnegie Supernova Project,
report spectroscopic observations (range 400-1000 nm) of 2007A (cf.
CBET 795), obtained on Jan. 6.06 UT with the European Southern
Observatory's 3.5-m New Technology Telescope (+ EMMI spectrograph).
The spectrum of 2007A bears strong resemblance to that of the normal
type-Ia supernova 1994D obtained 3 days before maximum light.  Assuming
a recession velocity of 5290 km/s for the host galaxy (Sandage 1978,
A.J. 83, 904), an expansion velocity of 11000 km/s is derived from the
absorption minimum of the Si II 635.5-nm doublet, which is the expected
velocity for normal type-Ia supernovae near maximum light.  A narrow
interstellar Na I 589.3-nm absorption at the redshift of the host galaxy
is detected with a formal equivalent width of 0.80 nm (with a large
uncertainty).  The blue continuum of the spectrum suggests only moderate
reddening.


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                         (C) Copyright 2007 CBAT
2007 January 6                   (CBET 796)               Daniel W. E. Green