Central Bureau for Astronomical Telegrams
IAUC 6410: 1996ae; 1996ab; GRO J1655-40
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Circular No. 6410
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1996ae IN NGC 5775
S. Benetti, European Southern Observatory (ESO); and T.
Zwitter, University of Ljubljana, report: "A low-signal-to-noise
CCD spectrogram (range 332-905 nm, resolution 0.8 nm) of SN 1996ae
(cf. IAUC 6409), obtained on May 27.98 UT with the ESO 1.5-m
telescope (+ Boller & Chivens spectrograph), is dominated by an H-
alpha emission (with a complex profile) superimposed on a red
continuum. The H-alpha consists of three components: an unresolved
one centered at 660.1 nm, an intermediate one centered at 660.1 nm
(FWHM about 2950 km/s), and a broad one centered at 665.4 nm (FWHM
about 13 350 km/s). This profile is reminiscent of that shown by
the peculiar type-II (IIn) supernova 1988Z (see Turatto et al.
1993, MNRAS 262, 128), about 100 days after maximum, but with the
substantial difference that the broadest component of H-alpha
emission in the SN 1996ae spectrum shows an unusual redward
displacement with respect to the narrower components. H-beta is
present in emission (centered at 489.1 nm), showing only the
intermediate component (FWHM about 2050 km/s). A weak He I 587.6-
nm emission (FWHM about 2000 km/s) is streaked by a very intense Na
I D interstellar band (from which a redshift of 1850 km/s is
derived for NGC 5775)."
SUPERNOVA 1996ab IN ANONYMOUS GALAXY
G. V. Williams, Harvard-Smithsonian Center for Astrophysics,
provides his measurement of SN 1996ab from a CCD image obtained on
May 26.221 UT by J. McEnery with the Mt. Hopkins 1.2-m reflector:
R.A. = 15h21m08s.35, Decl. = +27o55'36".8 (equinox 2000.0), which
is 9".3 west and 15".6 north of the galaxy's center. Williams
notes that the semiaccurate position for SN 1996ab on IAUC 6405
actually refers to the galaxy's center.
GRO J1655-40
R. Hunstead and D. Campbell-Wilson, University of Sydney,
report on the return of radio emission from GRO J1655-40,
accompanying the recent increase in x-ray (IAUC 6393) and optical/
ultraviolet (IAUC 6406) flux: "A 12-hr observation with the
Molonglo Observatory Synthesis Telescope (MOST) at 843 MHz on May
28.60 UT (mid-exposure) showed a point source of 55 +/- 5 mJy at
the optical position. No source was present at this position to a
limit of 3 mJy in an earlier MOST image on May 10."
(C) Copyright 1996 CBAT
1996 May 29 (6410) Daniel W. E. Green
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