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IAUC 6347: 1996M; 1996L

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IAUC number

                                                  Circular No. 6347
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a supernova (mag about 18), found on a U.K. Schmidt
telescope R plate taken on Mar. 19.7 UT by K. S. Russell and D. M.
James.  SN 1996M is located 21" due west of the center of the host
galaxy (in a faint knot on the edge of the galaxy), at R.A. =
12h51m17s.73, Decl. = -13o01'11".7 (equinox 2000.0).  A nearby star
of mag about 17.5 has position end figures 20s.57, 00'59".4.  No
image appears at the position of SN 1996M in several surveys, the
latest being in 1994 June.
     P. Garnavich, Harvard-Smithsonian Center for Astrophysics,
reports that an image obtained by N. Caldwell at the Mt. Hopkins
1.2-m telescope on Mar. 21 UT shows the supernova at V about 18.2.
     S. Benetti, European Southern Observatory (ESO); and N. Caon,
Space Telescope Science Institute, report:  "Inspection of a
preliminarily-reduced CCD spectrum (range 375.7-695.2 nm,
resolution 1.5 nm), obtained on Mar. 22.19 UT with ESO 3.6-m
telescope (+ EFOSC1), confirms this object as a type-II supernova,
about 50 days after maximum.  Strong H-beta and H-alpha lines with
P-Cyg profiles are superimposed on a red continuum.  Ca II (H and
K), Ti II 455.0-nm, Fe II 501.8- and 516.9-nm, and Na I D lines are
also present with P-Cyg profiles.  The expansion velocity deduced
from the H-beta, H-alpha, and Na I D absorption is about 7000 km/s.
The Fe II lines show a slower expansion velocity (about 4500 km/s).
The recession velocity of the parent galaxy (measured from emission
lines in the galaxy spectrum) is 6000 km/s.  Preliminary photometry:
V = 18.1, V-R = +0.5."
     L. Wang and J. C. Wheeler, University of Texas, write:  "We
have observed SN 1996M at the McDonald Observatory 2.1-m telescope
(+ imaging grism instrument).  Preliminary inspection of the
spectrum (range 425.4-814.2 nm, resolution 2.5 nm) confirms this
object as a type II supernova close to maximum light.  The H-alpha
and H-beta lines are strong and show P-Cyg profiles.  The FWZI of
the H-alpha line shows the fastest expansion velocity of the ejecta
to be about 10 000 km/s.  Other lines detected are He I/Na I at
587.6 nm and Fe II at 511.0 nm."

     Corrigendum.  On IAUC 6346, line 3, for  J. M. James.  read
D. M. James.

                      (C) Copyright 1996 CBAT
1996 March 22                  (6347)            Daniel W. E. Green

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