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IAUC 6109: LEONID METEORS 1994; CH Cyg; 1994ae

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                                                  Circular No. 6109
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM

     Reports of enhanced activity of the Leonid meteors on Nov. 17-
18, both via visual observation (despite the full moon) and radio
monitoring, have been received from P. Jenniskens (Ames Research
Center, NASA; and Dutch Meteor Society), K. Suzuki (Aichi, Japan)
and T. Nakamura (Radio Atmospheric Science Center, Kyoto University);
and P. Brown (University of Western Ontario).  Both the true rates
and the peak time are difficult to ascertain, though it seems
possible that the zenithal hourly rate was about 100 around Nov.
18.2 UT +/- 0.4 day (corresponding to solar longitude about 235o.7
+/- 0o.4, equinox 2000.0).

     A. Skopal, Astronomical Institute, Skalnate Pleso Observatory;
and H. M. Lloyd and M. F. Bode, John Moores University, Liverpool,
write:  "Skalnate Pleso photometry and International Ultraviolet
Explorer (IUE) observations show an eclipse of the active component
by the cool component in this symbiotic system.  Photometric
observations indicate a deep minimum of about 3 mag in the U band:
July 29.86 UT, U = 6.562, B = 7.620, V = 7.279; Aug. 29.10, 6.815,
7.936, 7.583; Oct. 1.02, 7.605, 8.364, 7.731; Oct. 12.87, 8.966,
9.401, 8.324; Oct. 15.80, 9.667,9.942, 8.589; Oct. 27.88, 9.136,
9.469, 8.440; Nov. 9.83, 9.322 9.575, 8.536; Nov. 23.72, 9.268,
9.764, 8.682.  An IUE spectrum obtained on Oct. 14 is similar in
both the shape and level of the continuum to that obtained on 1992
Nov. 24, during what would have been the last eclipse of a 756-day-
period system.  However, the latest spectrum shows strong emission
in the O I 130.5-nm line, which was absent on 1992 Nov. 24.  The
ultraviolet continuum has decreased relative to 1993 May 28 (IAUC
5815) by a factor of about 4 between 300 and 330 nm, to 5 x 10E-13
erg cmE-2 sE-1 AE-1, and by a factor of two around 150 nm, to 1.2
x 10E-12 erg cmE-2 sE-1 AE-1.  We estimate that the end of the
eclipse should occur in December.  Positions of the latest minima
(1992 Oct. and 1994 Oct.-Nov.) agree well with times of the
spectroscopic conjuction of the symbiotic pair in the proposed
triple-star model of CH Cyg."

SUPERNOVA 1994ae IN NGC 3370
     S. Nakano, Sumoto, Japan, forwards the following magnitude
estimates:  Nov. 29.740 UT, 12.5 (K. Takamizawa, Saku-machi,
Nagano-ken; photographic); 29.836, 12.5 (R. Kushida, Yatsugatake
South Base Observatory; unfiltered CCD); 30.854, 12 (K. Ikeya,
Shizuoka; visual).

1994 December 1                (6109)            Daniel W. E. Green

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