Electronic Telegram No. 342
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)
URL http://cfa-www.harvard.edu/iau/cbat.html


SUPERNOVAE 2005lx AND 2005mg
     M. Modjaz, R. Kirshner, P. Challis, and S. Blondin,
Harvard-Smithsonian Center for Astrophysics, report that a
spectrogram (range 350-740 nm) of SN 2005mg (cf. IAUC 8648),
obtained by P. Berlind on Dec. 29.12 UT, shows it to be a
young type-II supernova.  The spectrum contains H_alpha and
H_beta P-Cyg profiles and is heavily reddened.  Interstellar Na
I D absorption at the redshift of the host galaxy with an
equivalent width of about 0.3 nm is detected, indicating gas
along the line-of-sight in the host galaxy and thus suggesting
reddening by dust.  Adopting the NED recession velocity of 3973
km/s (Falco et al. 1999, PASP 111, 438) for the host galaxy,
the maximum absorption in the H_beta line is blueshifted by
11000 km/s.
     A spectogram of SN 2005lx (cf. IAUC 8646), obtained by
Berlind on Dec. 29.18, shows it to be most probably a young
type-II supernova.  The spectrum consists of a featureless and
blue continuum and is similar to an early spectrum of SN 1993J
(Matheson et al. 2000, A.J. 120, 1487).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 December 29                 (CBET 342)               Daniel W. E. Green