[IAUC] CBET 815: 20070121 : SUPERNOVAE 2007G AND 2007L

[IAUC mailing list]

                                                  Electronic Telegram No. 815
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVAE 2007G AND 2007L
     M. Ganeshalingam, T. N. Steele, A. V. Filippenko, and R. J. Foley,
University of California, Berkeley, report that CCD spectra (range
340-1040 nm), obtained on Jan. 21 UT with the 3-m Shane telescope at
Lick Observatory, show that 2007G (CBET 804) and 2007L (CBET 814) are
type-II supernovae.  Both have blue continua and hydrogen Balmer lines
with P-Cyg profiles, although the emission component of H-alpha greatly
dominates over the absorption component.  Removing the recession
velocities of 8880 km/s (found from narrow emission lines) and 5395 km/s
(Stoughton et al. 2002, A.J. 123, 485), the ejecta expansion velocities
(measured from the minimum in the blueshifted H-beta absorption) are
found to be 6500 and 8300 km/s for SNe 2007G and 2007L, respectively.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2007 CBAT
2007 January 21                  (CBET 815)               Daniel W. E. Green