Central Bureau for Astronomical Telegrams
IAUC 4131: gamma Cas; 1985g
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Circular No. 4131
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
gamma CASSIOPEIAE
D. Dal Fiume and F. Frontera, Istituto TESRE, CNR, Bologna;
G. Manzo and S. Re, Istituto IFCAI, CNR, Palermo; and R. Robba,
Department of Physics, University of Palermo, telex: "A 6.3-hr
EXOSAT medium-energy observation of gamma Cas on 1984 Dec. 7 has
detected a strong time-variability of the source, with flux
variations by a factor of two on timescales of a few hours. Both a
fast Fourier transform and an epoch-folding analysis show that
this variability is consistent with a source flux modulation of
period 6000 +/- 200 s. The Chi**2 per degree of freedom corresponding
to this periodicity is ~ 100. The peak-to-minimum amplitude of
this modulation is ~ 1.5, while the time-averaged 1-10-keV flux
from the source is ~ 3 mCrab. Owing to the limited observation
time, we cannot exclude that the fundamental period is actually
12 000 s, as strongly suggested by the temporal analysis. New x-
ray observations and archival researches are urged in order to
gain a better understanding of this periodicity."
PERIODIC COMET GICLAS (1985g)
Ephemeris continuation from the elements on MPC 10 156:
1985/86 ET R.A. (1950.0) Decl. p r m1
Oct. 22 3 26.42 + 3 51.1 0.901 1.847 13.3
Nov. 1 3 22.28 + 3 42.1
11 3 16.49 + 3 50.8 0.897 1.873 13.4
21 3 10.54 + 4 21.0
Dec. 1 3 05.91 + 5 13.0 0.977 1.915 13.7
11 3 03.63 + 6 23.6
21 3 04.25 + 7 48.2 1.137 1.971 14.2
31 3 07.88 + 9 21.9
Jan. 10 3 14.29 +11 00.1 1.361 2.039 14.8
20 3 23.20 +12 39.1
30 3 34.22 +14 16.0 1.630 2.116 15.4
Feb. 9 3 47.00 +15 48.4
19 4 01.24 +17 14.6 1.930 2.202 16.1
Mar. 1 4 16.67 +18 33.2
11 4 33.04 +19 43.1 2.247 2.293 16.7
Visual magnitude estimates by A. Hale (0.20-m refl.) and C. S.
Morris (0.25-m refl.), Mt. Wilson, CA: Oct. 13.48 UT, 13.4: (Hale);
15.33, 13.3 (Hale); 16.45, 13.4 (Morris); 17.34, 13.3 (Hale).
1985 November 1 (4131) Brian G. Marsden
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