Central Bureau for Astronomical Telegrams
IAUC 5573: 1992ao; 1992ap
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Circular No. 5573
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
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MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992ao IN NGC 7637
R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a supernova (mag about 17) in NGC 7637 on an R plate
taken by Q. A. Parker with the U.K. Schmidt Telescope on July 28.65
UT. The supernova is located at R.A. = 23h23m06s.54, Decl. =
-82 10'15".6 (equinox 1950.0, uncertainty in each coordinate 0".4),
or 53".5 east and 56".7 north of the galaxy's center. A nearby
star of similar brightness has end figures 01s.37, 09'51".3.
M. Della Valle, European Southern Observatory; and R. Gilmozzi,
Space Telescope Science Institute, report: "Flux-calibrated CCD
spectra (range 390-800 nm, resolution about 1.8 nm) obtained on
July 31.3, Aug. 1.3, and 2.3 UT, with the 3.6-m and 2.2-m telescopes
(+ EFOSC) at La Silla, show this object to be a type-II supernova
at an early stage. Preliminary analysis reveals not-yet-
prominent broad emission lines of H-beta and H-gamma, flanked by P-
Cyg absorptions, superimposed on a strong blue continuum. H-alpha
appears flat and wide, possibly coupled with a weak P-Cyg profile.
Other P-Cyg profiles are measured at 509 and 578 nm, possibly due
to Fe II (517.9 nm) and He I (587.6 nm). All the peaks of the
emissions appear blue-shifted in the galaxy rest frame by about 3
nm. In some respects, SN 1992ao may bear similarity to SN 1979C
(see Panagia et al. 1980, MNRAS 192, 861). The mean expansion
velocity derived from the minimum of the P-Cyg absorptions is about
8500 km/s."
SUPERNOVA 1992ap IN UGC 10430
K. Birkle, Max-Planck Institut fur Astronomie, Heidelberg,
reports his discovery, on a IIIa-J plate taken July 29 with the Calar
Alto 0.80-m Schmidt telescope, of a supernova (mag B about 18) in
UGC 10430 (R.A. = 16h28m47s.6, Decl. = +41 25'25", equinox 1950.0).
SN 1992ap, not visible on the Palomar Sky Survey print but confirmed
on a IIIa-F plate by Birkle, is superimposed on one of the
arms of this SB(rs)bc galaxy, located 7" east and 16" north of the
galaxy's center. A CCD image taken July 30 with the Calar Alto
3.5-m telescope by G. Thimm through an R filter shows that SN
1992ap is as bright as the bulge of the host galaxy. On Aug. 1, P.
Belloni, H.-J. Roser, and U. Hopp used the prime-focus focal reducer
system of the Calar Alto 3.5-m telescope to take a CCD-grism
spectrum (1200-s exposure, range 350-700 nm, resolution about 1.6
nm) of the object, which clearly shows the features of a type-I
supernova, perhaps 2 weeks past its maximum.
1992 August 3 (5573) Daniel W. E. Green
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