Central Bureau for Astronomical Telegrams
IAUC 4413: VY Aqr; 1987A; V1500 Cyg
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Circular No. 4413
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
VY AQUARII
G. M. Hurst, Basingstoke, England, telexes that J. Isles,
Limassol, Cyprus, has reported an outburst of VY Aqr, the last such
outburst having occurred in mid-1986 (cf. IAUC 4209). The following
visual magnitude estimates are available: June 28.670 UT,
[15.5 (R. H. McNaught, Siding Spring Observatory); 30.526, [15.0
(McNaught); 30.947, 13.3 (Isles); July 1.045, 12.1 (Isles); 1.5,
10.9-11.0 (McNaught).
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
S. J. Matcher, W. P. S. Meikle, and B. L. Morgan, Imperial
College, London, report: "We have found an error in our estimate
of the angular displacement from SN 1987A of the source described
on IAUC 4391 and 4394. A correction to the observed displacement
to allow for the atmospheric seeing function was subtracted, whereas
it should have been added. The corrected value for the angular
displacement on Apr. 14 is 0".074 + 0".008 at 658.5 nm. We confirm
the p.a. reported on IAUC 4391. We have made no attempt to perform
image reconstruction, the p.a. thus being subject to a 180-degree
ambiguity." Corrigendum: on IAUC 4391, line 1, for Marcher read Matcher.
Visual magnitude estimates: June 24.65 UT, 4.2 (D. A. J.
Seargent, The Entrance, N.S.W.); 25.36, 4.3 (Seargent); 26.39, 4.3
(Seargent); 27.54, 4.4 (A. C. Beresford, Adelaide, S. Australia);
28.34, 4.5 (Seargent); 29.42, 4.4 (Beresford); 30.40, 4.4 (R. H.
McNaught, Siding Spring Observatory); July 1.36, 4.4 (Beresford).
V1500 CYGNI
T. Chlebowski, Center for Astrophysics and Warsaw University;
and J. Kaluzny, Space Telescope Science Institute and Warsaw
University, write: "On the basis of extensive CCD monitoring and
Multiple-Mirror Telescope spectroscopic observations of V1500 Cyg
(Nova Cyg 1975), we conclude that this is most probably an AM-Her-
type object ('polar'). Its light curve more resembles those of
polars than of any other subgroup of cataclysmic variables, and its
extremely strong He II (468.6 nm) line is also characteristic of
polars and intermediate polars. Polarimetric measurements should
confirm our conclusion."
1987 July 1 (4413) Daniel W. E. Green
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