Central Bureau for Astronomical Telegrams
IAUC 4491: CH Cyg; EXO 023432-5232.3; 1986l
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Circular No. 4491
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
CH CYGNI
P. L. Selvelli, CNR and Astronomical Observatory, Trieste; A.
Cassatella, IUE Observatory, Madrid; and M. Hack, Department of
Astronomy, University of Trieste, write: "On Nov. 1, IUE observations
of the symbiotic star CH Cyg were made with the purpose of
observing the ultraviolet emission by the small jet (size about 2",
p.a. 135 deg), detected in the radio by Taylor et al. (1986, Nature
319, 38) and confirmed in the optical by Solf (1987, A.Ap. 180,
207). The star was properly placed just outside the SWP large
aperture along the principal axis, so as to leave only the jet inside
the aperture. Surprisingly, the observations have detected the
presence of an emission knot close to the opposite side of the
large aperture, 18" away from the star. Since on Nov. 1 the p.a.
of the aperture axis was 142 deg, this indicates that the knot is
almost exactly in the same direction as the jet and suggests a high
collimation of the ejecta. The knot has been detected in Si III
(189.2 nm, strong), N III (175.0 nm), and O III (166.3 nm)."
EXO 023432-5232.3
J. Bailey, Anglo-Australian Observatory; D. T. Wickramasinghe,
Australian National University; J. Hough, Hatfield Polytechnic; and
M. S. Cropper, Mullard Space Science Laboratory, telex: "Observations
of EXO 023432-5232.3 (Beuermann et al., IAUC 4289; 1987, A.
Ap. 175, L9) with the Anglo-Australian Telescope confirm that it is
an AM-Her binary and show that it is also an eclipsing binary. On
Nov. 12, the object was observed at magnitudes B about 18.4, R about 18.0,
I about 17.6. Deep eclipses, lasting about 8 min, were observed in all
bands, reaching fainter than B = 23, R = 21, I = 20. On either
side of the eclipse, the R and I lightcurves show maxima reaching R
= 17 and I = 16.5, with circular polarization reaching -10 and -25
percent, respectively; no polarization was observed in the blue.
This object resembles the other eclipsing AM-Her binary, E1114+182,
but it is a little brighter and has a longer duration eclipse."
COMET WILSON (1986l)
Total visual magnitude estimates (L = reflector): Sept. 28.82
UT, 12.3 (J. Kobayashi, Kumamoto, Japan, 0.31-m L); Oct. 3.82, 12.4
(Kobayashi); 20.16, 10.5: (M. V. Zanotta, near Como, Italy, 0.25-m
L); Nov. 17.52, 11.3 (A. Hale, Las Cruces, NM, 0.41-m L).
1987 November 19 (4491) Daniel W. E. Green
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