[IAUC] CBET 994: 20070707 : SUPERNOVAE 2007ct AND 2007cu

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                                                  Electronic Telegram No. 994
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 2007ct AND 2007cu
     J. M. Silverman, M. Ganeshalingam, X. Wang, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD spectra
(range 330-1000 nm), obtained on July 7 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that both 2007ct and 2007cu (CBET 988)
are type-II supernovae.  Hydrogen Balmer lines having P-Cyg profiles are
present in both spectra, although the emission component of H-alpha in
2007cu greatly dominates over the absorption component.  Removing a
recession velocity of 4198 km/s (Huchra et al. 1999, Ap.J. Suppl. 121,
287) for 2007ct, the minimum of the H-alpha absorption is blueshifted by
12500 km/s.  Removing a recession velocity of 9401 km/s (Bottinelli et al.
1993, A.Ap. Suppl. 102, 57) for 2007cu, the minimum of the H-alpha
absorption is blueshifted by about 9000 km/s, but this value is quite
uncertain because the absorption component is weak.


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                         (C) Copyright 2007 CBAT
2007 July 7                      (CBET 994)               Daniel W. E. Green