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IAUC 6434: 1996ak; HV 5756; SS Lac

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IAUC number

                                                  Circular No. 6434
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)

SUPERNOVA 1996ak IN NGC 5021
     F. Colas, Institut d'Astrophysique de Paris, reports the
discovery by Christian Buil, on CCD images obtained on July 13.93
UT with a 2.12-m reflector at Pic du Midi Observatory, of a
supernova (mag 18, compared with Guide Star Catalogue stars)
located 25" west and 13" south of the center of NGC 5021 (R.A. =
13h12m.1, Decl. = +46o12', equinox 2000.0).  Confirmation of SN
1996ak was reported by M. Reugnier at Toulouse on July 14.8 and by
C. Cavadore at Pic du Midi on July 14.9.
     A. V. Filippenko, University of California at Berkeley (UCB),
reports that his inspection of uncalibrated CCD spectra (range 320-
1000 nm) obtained by D. Stern and L. Maxfield (UCB) on July 15 UT
with the Lick Observatory 3-m Shane reflector reveals that SN
1996ak is a type-II supernova.  The H-alpha profile consists of a
strong, broad emission line and a relatively weak P-Cyg absorption
component, but absorption is more prominent among the higher-order
Balmer lines.

HV 5756
     The MACHO collaboration (cf. IAUC 6312, plus K. Pollard) has
discovered that the 17.5-day period type-II Cepheid variable HV
5756 in the Large Magellanic Cloud is an eclipsing binary whose
next primary minimum will occur on 1996 July 18.0 UT +/- 2 days.
The star is located at R.A. = 5h19m26s.8, Decl. = -69o51'52"
(equinox 2000.0), with magnitude V approximately 15.8, V-R
approximately +0.4, and a V semi-amplitude of 0.35 mag.  During
eclipse, the star will be about 0.5 mag fainter at V.  A finder
chart and further information about eclipse development may be
found at either http://wwwmacho.mcmaster.ca/HV5756/index.html or
http://wwwmacho.anu.edu.au/HV5756/index.html.  Potential observers
are requested to contact welch@physics.mcmaster.ca (or Doug Welch
at telephone 905-525-9140, x23186) to coordinate observations.

     P. B. Etzel and N. H. Volgenau, San Diego State University,
communicate:  "Pursuant to IAUC 6429, two spectra of SS Lac taken
around July 9.37 UT (at historical orbital phase 0.32) provide a
velocity difference of 125 km/s, with component strengths reversed
from our previous measure.  Binarity is confirmed."

                      (C) Copyright 1996 CBAT
1996 July 15                   (6434)            Daniel W. E. Green

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