Central Bureau for Astronomical Telegrams
IAUC 4285: GK Per; 1986l
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Circular No. 4285
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
GK PERSEI
A. Cassatella, International Ultraviolet Explorer Observatory,
Villafranca, reports: "Ultraviolet observations by IUE on Nov.
30.7 and Dec. 2.6 UT show an intense 120-320-nm continuum and
strong emission lines of He II (164.0, 320.4 nm) and O III (313.2
nm), as well as fainter emissions of N V (124.0 nm), C IV (155.0
nm), and Si IV (140.0 nm). The strengths of the continuum and of
the emission lines are comparable to those observed during the
active phase in early 1981. The ultraviolet spectrum of Dec. 2 is a
factor of about 1.5 stronger than on Nov. 30, while the V magnitude
from the fine-error-sensor onboard IUE was about the same (V about
11.2). Two long-wavelength (195-320-nm) spectra obtained on Dec. 2
give fluxes that are different by a factor of about 1.3, indicating
possible short-term variability on a timescale less than about 1 hr."
Further visual magnitude estimates (cf. IAUC 4282), some
reported via J. Mattei, AAVSO: Dec. 5.97 UT, 11.3 (G. Dyck, N.
Dartmouth, MA); 6.16, 10.3 (R. Ariail, Columbia, SC); 6.84, 10.6
(S. Korth, Monheim, W. Germany); 8.73, 10.4 (Korth); 9.81, 10.0 (K.
Medway, Southampton, England); 11.10, 10.5 (R. Royer, Lakewood,
CA); 12.28, 10.3 (Royer); 13.28, 10.2 (Dyck); 13.97, 10.0 (Dyck);
14.10, 10.2 (J. Griese, Stamford, CT); 15.08, 10.2 (Griese).
VARIABLE IN NGC 6637
P. A. Charles, K. Mukai and T. Naylor, Oxford University, telex
that spectroscopy with the Anglo-Australian Telescope shows the
object reported by Williams (IAUC 4247) to be a Mira-type variable
within the cluster membership, with spectral type later than M5.
COMET WILSON (1986l)
Total visual magnitude estimates (L = reflector): Nov. 25.99
UT, 10.9 (J. Bortle, Stormville, NY, 0.32-m L); 27.79, 10.5 (J.-C.
Merlin, Le Creusot, France, 0.15-m L); 28.31, 10.8 (E. Jacobson,
Evansville, MN, 20x80 binoculars); 29.98, 10.7 (J. DeYoung, near
Leesburg, VA, 0.25-m L; 2' tail in p.a. 70 deg); 30.00, 11.2 (G. R.
Chester, Rixeyville, VA, 0.20-m L); Dec. 3.08, 9.8 (R. Keen, Mt.
Thorodin, CO, 0.32-m L; tail 3' in p.a. 60 deg); 3.11, 10.3 (C. S.
Morris, Whitaker Peak, CA, 0.26-m L); 7.63, 10.0 (M. V. Zanotta,
near Como, Italy, 0.25-m L).
1986 December 17 (4285) Daniel W. E. Green
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