Central Bureau for Astronomical Telegrams
IAUC 3327: Sco X-1; 2A 0311-227; WZ Sge
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Read IAUC 3328
Circular No. 3327
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 617-864-5758
SCORPIUS X-1
L. Petro, Massachusetts Institute of Technology, writes: "The
SAS-3 satellite will make a pointed-mode observation of Sco X-1
from Mar. 7d20h to 16d13h UT. The energy range 1-50 keV will be
measured with seven energy channels and 0.8-s time resclution.
This will be the first extensive x-ray study that provides continuous
monitoring of the soft and hard spectral components of Sco X-1.
We are requesting observers to make high-time-resolution measurements
of the brightness and spectrum of Sco X-1 during the x-ray
observation. The optical brightness is known to have 40-s flares
and to have emission lines with FWHM 4-8 A. Since no simultaneous
x-ray and spectroscopic observations have been made hitherto we
wish to stress their importance. Interested observers should
contact me at telephone 617-253-3169 or telex 92-1473 MITCAM."
2A 0311-227
With further reference to the items on IAUC 3324 and 3326,
D. P. Hearn informs us that F. Boley specified to him 81.05 min as
one of two possible optical orbital periods (the other being ~ 86
min) for the suggested counterpart of 2A 0311-227. The x-ray data
appear to be consistent with a period of 81.0 +/- 0.1 min.
S. Tapia, Lunar and Planetary Laboratory, reports: "The proposed
optical counterpart of 2A 0311-227 displays a short minimum
of circular polarization and a linear-polarization pulse at the
times given by the ephemeris (heliocentric) 1979 Jan. 21.1793 UT +/-
(0.05627 +/- 0.00002)E. Polarization measurements conducted in the
6300-9000 A spectral band indicate that there is a second short
minimum of circular polarization at phase 0.4 +/- 0.03, that outside
the two minima the circular polarization is always positive, and
that the amplitudes of the circular-polarization modulations and
the linear-polarization pulses fluctuate between 6 and 9 percent."
WZ SAGITTAE
Visual magnitude estimates: 1978 Nov. 30.43 UT, [13.2 (K.
Hirosawa, Japan); 1979 Jan. 11.07, 11.9 (J. Morgan, Prescott, AZ);
13.75, 11.4 (G. M. Hurst, Northampton, England); Feb. 4.54, 11.7
(Morgan); 6.55, 12.8 (Morgan).
1979 February 12 (3327) Brian G. Marsden
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