Central Bureau for Astronomical Telegrams
IAUC 5549: 1992Z; N Sco 1992; V CrA
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Circular No. 5549
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)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1992Z IN ANONYMOUS GALAXY
M. Della Valle, European Southern Observatory, reports: "
Inspection of a spectrogram (range 400-840 nm, resolution about 2 nm)
of SN 1992Z (cf. IAUC 5533), obtained with the New Technology
Telescope (+ EMMI) at La Silla on June 23.1 UT under non-photometric
conditions, shows this object to be a type-II supernova. The
spectrum is dominated by the emission of H-alpha coupled with a P-Cyg
profile. The expansion velocity corresponding to the difference
between the rest wavelength in the galaxy's frame and the minimum
of the absorption is about 8000 km/s. "
NOVA SCORPII 1992
T. E. Harrison, Mt. Stromlo Observatory, reports: "The following
infrared photometry of N Sco 1992 was obtained with the Siding
Springs 2.3-m telescope: June 19.57 UT, J = 6.06, H = 5.74, K =
5.34, L = 4.59, M = 3.39 (errors < 0.05 mag, except for M, which is
+/- 0.10). The resulting energy distribution is peculiar. The J-L
magnitudes can be fitted by a blackbody of T about 3000 K. However,
the flux at M is well above such an energy distribution. The large
excess at M suggests that significant emission from the CO fundamental
(4.65 microns) may be occuring. The J, H, and K photometry
can also be fitted by free-free energy distribution, assuming the
visual extinction is Av about 1."
Further visual magnitude estimates (cf. IAUC 5546): June 11.06
UT, 7.8 (V. F. de Assis Neto, Sao Francisco de Oliveira, Brazil);
11.39, 8.4 (P. F. Williams, Heathcote, N.S.W.); 12.03, 7.9 (de
Assis Neto); 12.97, 8.2 (de Assis Neto); 16.52, 8.7 (P. F. Williams,
Heathcote, N.S.W.); 20.42, 8.9 (G. Garradd, Tamworth, N.S.W.);
21.41, 8.9 (Garradd).
V CORONAE AUSTRINAE
This R CrB-type variable star has shown a slow decline in
recent months, as indicated by the following visual magnitude
estimates by P. F. Williams, Heathcote, N.S.W. (communicated by R. H.
McNaught, Anglo-Australian Observatory): Mar. 3.74 UT, 9.9; 10.67,
10.1; 26.78, 10.3; Apr. 4.79, 10.5; 30.66, 10.7; May 4.57, 10.7;
13.52, 10.8; 24.48, 11.3; 27.51, 11.4; 31.52, 11.4; June 3.51, 11.3.
1992 June 24 (5549) Daniel W. E. Green
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