Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 2936: X-RAY SOURCES; gamma CASSIOPFIAE

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 2935  SEARCH Read IAUC 2937
IAUC number


                                                  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

Read IAUC 2935  SEARCH Read IAUC 2937


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!