[IAUC] CBET 1702: 20090223 : SUPERNOVAE 2009ag, 2009ah, AND 2009ai

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                                                  Electronic Telegram No. 1702
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVAE 2009ag, 2009ah, AND 2009ai
     N. Morrell and M. Stritzinger, on behalf of the Carnegie Supernova
Project, report that they have obtained spectra (range 380-923 nm) of 2009ag
(cf. CBET 1698), 2009ah (cf. CBET 1699), and 2009ai (cf. CBET 1700) on Feb.
23 UT with the Las Campanas Observatory's 2.5-m du Pont telescope.  The
spectrum of 2009ag reveals it to be a young type-Ia supernova around a week
before maximum light; adopting a host-galaxy recession velocity of 2590 km/s
(Thereau et al. 2007, A.Ap. 465, 71) for the host galaxy (ESO 492-2), Si II
(635.5-nm) is measured to be blue-shifted by roughly 10500 km/s.  SN 2009ah
appears to be a type-IIb supernova around two weeks past maximum; cross-
correlation with a library of supernovae spectra (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) shows 2009ah to be very similar to SN 2000H between
11 and 13 days after maximum.  A spectrogram of 2009ai shows it to be a
type-Ia supernova several weeks after maximum.


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                         (C) Copyright 2009 CBAT
2009 February 23                 (CBET 1702)              Daniel W. E. Green