Electronic Telegram No. 865
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2007af IN NGC 5584
     F. Salgado and M. Hamuy, University of Chile; and N. Morrell and G.
Folatelli, Las Campanas Observatory, on behalf of the Carnegie Supernova
Project, report spectroscopic observations (range 400-1000 nm) of 2007af
(cf. CBET 863), obtained on Mar. 4.34 UT with the European Southern
Observatory's 3.5-m New Technology Telescope (+ EMMI spectrograph).  The
spectrum of 2007af bears strong resemblance to that of the normal type-Ia
supernova 1994D obtained 10 days before maximum light.  Assuming the
recession velocity of 1638 km/s for the host galaxy, NGC 5584 (Koribalski
et al. 2004, A.J. 128, 16), an expansion velocity of 15200 km/s is derived
from the absorption minimum of the Si II 635.5-nm doublet, which is a
typical velocity for normal type-Ia supernovae well before maximum light.
The near-infrared Ca II triplet at 850, 854, and 866 nm is observed with
a prominent P-Cyg profile and an expansion velocity of 20000 km/s.  No
narrow interstellar Na I 589.3-nm absorption at the redshift of the host
galaxy is detected.  The blue continuum of the spectrum suggests little
or no reddening.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2007 CBAT
2007 March 4                     (CBET 865)               Daniel W. E. Green