Central Bureau for Astronomical Telegrams
IAUC 4224: 1986G; KUWANO'S OBJECT IN Aql = CGSS 1175
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Read IAUC 4225
Circular No. 4224
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
SUPERNOVA 1986G IN NGC 5128
V. M. Blanco, Cerro Tololo Interamerican Observatory, reports
the following photometric measurements, obtained on May 11.09 UT:
V = 11.46, B-V = +1.02, V-B = +0.78, V-I (Cousins) = +0.85.
J. Aycock, F. Baas, M. F. Bode, T. R. Geballe, A. J. Longmore,
A. D. MacFadzean, M. G. Smith and D. M. Walther, in collaboration
with J. R. Graham and W. P. S. Meikle, report: "A 7-channel cooled
grating spectrometer, mounted on the U.K. Infrared Telescope, Mauna
Kea, was used to measure spectra in the J, H and K windows on May
24, 25 and 26, respectively. The spectra show many prominent,
broad, absorption/emission features in each band, to an extent that
makes the continuum difficult to define. Of particular note is a
very broad and deep 'absorption' that appears to extend from 1.20
to 1.55 microns (FWHM). However, at present our spectra do not cover
the region from 1.36 to 1.49 microns, so the intensity could peak again
in the unobserved spectral region. The short-wavelength end of
this remarkable feature is clearly responsible for the extremely
red J-H colors of classical type I supernovae at this epoch. At
first sight the explanation of the red J-H colors as due to absorption
by Si I 1.203 micron (Graham 1986, M.N.R.A.S. 220, 27P) seems
unlikely because the wavelength of the absorption should be blueshifted
by ~ 10 000 km/s and consequently should occur at 1.16 microns."
Visual magnitude estimates by R. O. Evans (E), Hazelbrook,
and R. H. McNaught (M), Coonabarabran, N.S.W., the first six
correcting those on IAUC 4208: May 3.5 UT, 12.0 (E); 3.545, 11.8 (M);
3.589, 11.9 (M); 4.5, 12.5 (E); 4.507, 12.4 (M); 4.654, 11.8 (M);
6.6, 11.8 (E); 7.35, 12.3 (E); 8.5, 12.0 (E); 9.5, 12.0 (E); 10.5,
11.9 (E); 11.5, 11.6 (E); 12.4, 11.6 (E); 13.63, 11.8 (M); 14.53,
11.7 (M); 15.38, 11.6 (M); 16.39, 11.8 (M); 18.61, 11.8 (M); 20.65,
11.9 (M); 21.49, 12.2 (M); 28.48, 12.7 (M); 29.46, 12.9 (M); 30.47,
12.8 (M); 31.41, 13.3 (M); June 1.51, 13.5 (M).
KUWANO'S OBJECT IN AQUILA = CGSS 1175
M. Morel, Rankin Park, N.S.W., notes that this object appears
to be identical with star 1175 of Stephenson's (1984, Publ. Warner
Swasey Obs. 3, No. 1) "General Catalogue of Galactic S Stars" (2nd
edition), where its magnitude is given as mv = 10.5 and its
spectrum as M6S. Further visual magnitude estimates by McNaught: May
25.6 UT, 9.5; 28.63, 9.7.
1986 June 3 (4224) Brian G. Marsden
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