Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4342: 4U 0115+63 AND X-RAY N; 1987A; N And 1986

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 4341  SEARCH Read IAUC 4343
IAUC number

                                                  Circular No. 4342
Central Bureau for Astronomical Telegrams
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

4U 0115+63 AND X-RAY NOVA
     F. Makino, Institute of Space and Astronautical Science,
Tokyo, reports on behalf of the Ginga Team that the Ginga all-sky
monitor (ASM) has detected an outburst of the transient x-ray
source 4U 0115+63 and an x-ray nova at R.A. = 13h53m.0, Decl. = -64.4
(equinox 1950.0, uncertainty 0.2 deg).  Both sources had an intensity
of about 300 mCrab on Feb. 25 when ASM operation started.  The
intensity of the x-ray nova has been almost constant, while that
of 4U 0115+63 gradually decreased to Mar. 7.  The error circle of
the nova includes MX 1353-64 (Markert et al. 1977, Ap.J. 218,
801).  The recurrence of the outburst of 4U 0115+63 agrees with
the prediction by Whitlock et al. (1985, Bull. AAS 17, 849).

     J. E. Steiner, Instituto de Pesquisas Espaciais, Sao Jose dos
Campos, informs us that his institute operates a balloon-launching
facility at Cachoeira Paulista, Brazil (long. = -45, lat. -23 ).  The
facility is operational and able to launch payloads of up to 2
tonnes.  It is open to any group interested in launching stratospheric
balloons from the southern hemisphere.  Groups interested
in observing SN 1987A at balloon ceiling conditions, with or
without local scientific collaboration, should contact him at
telephone 55/123-22-9977, ext. 383, or telex (Brazil) 1233530 INPE BR.
     J. W. Menzies, South African Astronomical Observatory,
reports: "From spectra obtained on each night during Feb. 24-Mar. 2
I find that the velocity of approach of the broad H alpha absorption
line decreased linearly from about 18 300 km/s on Feb. 24.90 UT at a
daily rate of about 780 km/s.  R. M. Catchpole has interpreted UBVRI-
JHKL photometry obtained at SAAO over the same period as arising
from an expanding, cooling blackbody and finds the same deceleration
rate, if he assumes a distance modulus of 18.5 for the LMC
and a foreground absorption of Av = 0.6 mag."

     Photoelectric magnitudes by R. Monella (M), Covo; and G.
Favero, F. Fiamoi and G. A. Milani (F), Padua, Italy: Jan. 20.74
UT, V = 11.24, B-V = +0.49 (F); 21.75, V = 11.32, B-V = +0.52, U-B
= -0.53 (F); 24.868, V = 11.67, B-V = +0.55, U-B = -0.53 (M).

1987 March 12                  (4342)              Brian G. Marsden

Read IAUC 4341  SEARCH Read IAUC 4343

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

Valid HTML 4.01!