Central Bureau for Astronomical Telegrams
IAUC 4427: 1987J, 1987K; VY Aqr; 1987A
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Circular No. 4427
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
SUPERNOVAE 1987J AND 1987K
P. Whitelock, South African Astronomical Observatory, reports:
"A spectrum by A. P. Fairall (University of Cape Town), Winkler,
and Van Wyk at SAAO on July 30-31 indicates that SN 1987J in ESO
220739-1907.1 (= ESO 601-G26; cf. IAUC 4426) is a type-II SN."
A. V. Filippenko, University of California, Berkeley, reports:
"Preliminary analysis of spectra obtained at Lick Observatory on
July 31 shows that SN 1987K in NGC 4651 (cf. IAUC 4426) is a type-
II object within 1 week of maximum brightness. It is superposed on
an H II region. The SN (visual magnitude is roughly 13) exhibits a very
blue, almost featureless continuum, but P-Cyg profiles of H-alpha and H-beta
are clearly visible. The width of the H-alpha emission line is roughly
15 000 km/s. Spectra covering the approximate range 430-820 nm were
obtained with the 3-m Shane telescope by W. J. M. van Breugel, P. J.
McCarthy, and T. M. Heckman (UCB), and over the range 430-760 nm
with the 1-m Nickel reflector by M. A. Strauss (UCB). Observers
are urged to obtain spectra and photometric measurements of this SN
as often as possible, in view of its early detection and brightness."
Fairall, Winkler and Van Wyk report that a spectrum
obtained at SAAO suggests that SN 1987K is a type-I SN.
VY AQUARII
F. Jablonski, Instituto de Pesquisas Espaciais, CNPQ, Brazil;
and G. Quast and C. A. P. C. O. Torres, Laboratorio Nacional de
Astrofisica (LNA), CNPQ, report the following UBV photometry
obtained during the recent outburst of VY Aqr (IAUC 4413) using the
0.6-m telescope of the LNA: July 3.206 UT, V = 12.62, B-V = -0.16,
U-B = -0.81; 3.209, 12.62, -0.13, -0.82; 3.215, 12.63, -0.16,
-0.81; 4.233, 14.94, -0.16, -0.83; 4.244, 15.05, -0.06, -0.96.
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
N. Suntzeff and M. Hamuy, Cerro Tololo Interamerican Observatory,
report: "On July 30.4 UT, we obtained the following photometry
of SN 1987A with the CTIO 0.4-m telescope: V = 4.71, B-V =
+1.64, U-B = +2.42, V-R = +1.04, R-I = +0.36. This implies a
change in magnitude of +0.011 mag/day if we assume the fading has
been linear since July 5.4 (our last clear night at CTIO), consistent
with the change in magnitude observed at CTIO between June 29
and July 5."
1987 July 31 (4427) Daniel W. E. Green
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