[IAUC] CBET 608: 20060829 : SUPERNOVA 2006en IN MCG +05-54-41

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                                                  Electronic Telegram No. 608
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 2006en IN MCG +05-54-41
     N. Elias-Rosa, S. Benetti, E. Cappellaro and A. Harutyunyan,
Osservatorio Astronomico di Padova; A. Pastorello, Queen's University,
Belfast; and P. Mazzali and S. Taubenberger, Max-Planck-Institut fuer
Astrophysik, Garching, report that a spectrum of SN 2006en (cf. CBET
606, IAUC 8741), obtained on Aug. 28.9 UT by G. Andreuzzi with the
Telescopio Nazionale Galileo (+ Dolores; grism LR-B, spectral range
350-800 nm, resolution 1.2 nm), shows it to be a normal type-Ia
supernova around maximum light.  Adopting the NED recession velocity
of 9575 km/s for the parent galaxy (from Falco et al. 2000, "The
Updated Zwicky Catalog", and 1999, PASP 111, 438), the expansion
velocity deduced from the Si II 635.5-nm minimum is 10200 km/s.  An
interstellar Na I D absorption feature is visible in the host galaxy
rest frame with EW about 2 nm, suggesting a reddening E(B-V) > 0.3 mag
[Turatto et al. 2003, in *From Twilight to Highlight the Physics of
Supernovae*, ed. by Leibundgut and Hillebrandt (Springer-Verlag), p.
200].  Taking into account the apparent magnitudes reported on CBET
606, it would appear that SN 2006en is an extremely luminous object,
but this seems inconsistent with the above spectrophotometry and with
the normal expansion velocity.


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                         (C) Copyright 2006 CBAT
2006 August 29                   (CBET 608)               Daniel W. E. Green