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IAUC 6517: 1996bx; EG Cnc

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                                                  Circular No. 6517
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)

     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6418) reports the discovery of an apparent supernova on a CCD
image taken by S. Chan on the Mount Stromlo 1.27-m reflector (+
Macho Camera).  SN 1996bx is located near Abell 3202 at R.A. =
3h59m16s.45, Decl. = -53d22'26".3 (equinox 2000.0), which is 0".8
east and 0".2 north of the nucleus of the host galaxy.  SN 1996bx
is visible at mR about 19.2 on V and R CCD images taken on Nov. 18,
and it was not detected on similar frames taken on Aug. 23; CCD
images taken with the 1.27-m reflector on Nov. 20, Dec. 1 and Dec. 4
show the object present at mR = 19.2, 19.7 and 19.8, respectively.
A finder chart is available at http://msowww.anu.edu.au/~reiss/Abell_SNSearch.

     S. Benetti and M. Turatto, European Southern Observatory, report
that they obtained a CCD spectrogram (range 370-970 nm, resolution 1.5 nm)
of the SN candidate on Dec. 7.3 UT at V = 18.3 with the 3.6-m telescope
(+ EFOSC).  Because of poor seeing conditions the spectrum of the object is
heavily contaminated by that of the host galaxy at z = 0.058, as deduced
from Ca II H and K, G-band and Mg I absorptions.  Nevertheless, the typical
broad features of a supernova are definitely present.  Broad lines of Ca II
H and K, Fe II, Si II 635.5-nm and the Ca II infrared triplet have relative
intensities consistent with a type Ia SN some three weeks after maximum.

     L. Germany and B. Schmidt, Mount Stromlo and Siding Spring
Observatories, report that a spectrum with the 2.3-m telescope + grism shows
an object consistent with a type Ia supernova approximately 3-4 weeks past
maximum.  The redshift derived from the Na D lines in the host galaxy is
z approximately 0.06.

     K. Matsumoto, Osaka Kyoiku University, reports: "We obtained
continuous CCD V-band lightcurves of EG Cnc on Dec. 2.625-2.791 UT and
Dec. 3.625-3.708 UT with a 0.51-m reflector at Osaka Kyoiku University.
The observed lightcurves revealed superhumps with a low (0.03-0.04 mag)
amplitude. A preliminary analysis for combined lightcurves yielded a
period of 0.0582 day, which is one of the shortest known among dwarf
novae. The long interval since the last outburst and large amplitude
(> 7 mag) of the outbursts, together with the short superhump
period, support the WZ Sge-type classification for this star."
     Visual magnitude estimates by P. Schmeer, Bishmisheim, Germany:
Dec. 2.991 UT, 11.8; 5.972, 12.8; 6.072, 12.8; 6.154, 12.8.

                      (C) Copyright 1996 CBAT
1996 December 9                (6517)              Brian G. Marsden

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