Central Bureau for Astronomical Telegrams
IAUC 2936: X-RAY SOURCES; gamma CASSIOPFIAE
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Read IAUC 2937
Circular No. 2936
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
X-RAY SOURCES
J. P. Delvaille, Center for Astrophysics, reports the following
positions, obtained from the SAS-3 rotating modulation collimator
experiment during Feb. 19-25, for x-ray sources in the LMC:
LMC R. A. (1950) Decl. LMC R. A. (1950) Decl.
X-1 5 40 09 -69 46 40 X-3 5 38 51 -64 06 51
X-2 5 21 18 -72 00 18 X-4 5 32 58 -66 24 54
The 90-percent confidence radius is 1'.0. The observation of LMC
X-4 marks the reappearance of this source at a strength comparable
to that at the original Uhuru observation in 1971. The following
candidate objects given by Rapley and Tuohy (1974, Astrophys.J.
191, L113) lie within the present error circles: for LMC X-1, R 148
and MC 77; for LMC X-3, Star 1.
F. K. Li, Massachusetts Institute of Technology, reports that
the x-ray source MX1608-52, observed by the M.I.T. experiment aboard
OSO-7, is at R.A. = 16h08m.8, Decl. = -52o15'.0 (equinox 1950.0; l =
330o.95, b = -0o.81), with a 90-percent confidence radius of 0o.25.
This position is within the error box of the source of x-ray bursts
(IAUC 2932) and the x-ray flare (IAUC 2859) in Norma. The source
varies by a factor of > 2 over weeks and has a peak intensity of
10**-9 erg cm**-2 s**-1 in the 3-10 keV range. The spectrum of the
source is rather hard (kT ~ 30 keV).
W. Liller, Center for Astrophysics, reports that C. Y. Shao
has improved the measurement of the position of the candidate for
MXB1730-335 (cf. IAUC 2929) as follows (uncertainty now ~ 1"):
R. A. (1950) Decl.
Cluster center 17 30 07.00 -33 21 17.1
Brightest point 17 30 06.99 -33 21 19.7
gamma CASSIOPFIAE
A. D. Mallama, Computer Sciences Corporation; and D. R.
Skillman, Computer Usage Company, report the following photoelectric
observations (cf. IAUC 2900), obtained at the Goddard Space
Flight Center: Feb. 10.086 UT, V = 2.18; 15.004, V = 2.23, B-V =
-0.09. The comparison was kappa Cas (assumed V = 4.16, B-V = +0.13).
1976 April 1 (2936) Brian G. Marsden
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