Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3392: Poss. X-RAYS FROM MXB1730-333; SS 433

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 3391  SEARCH Read IAUC 3393
IAUC number

                                                  Circular No. 3392
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 617-864-5758

     M. Oda, Institute of Space and Aeronautical Science, University
of Tokyo, telexes: "The X-Ray Astronomy Satellite Hakucho has recorded
unusual x-ray activity since Aug. 8 from a position with a 1o
error circle including the Rapid Burster MXB1730-333, strongly suggesting
the Rapid Burster itself has become active.  The observed
activity began with a train of bursts typical of MXB1730-333, with
intervals ranging from 1 to several min, and a longer pause after a
larger burst.  Since Aug. 8, the burst profile has gradually
changed to a trapezoidal form lasting 2-4 min with intervals between
bursts of 10-30 min."

SS 433
     C. B. Cosmovici, Max-Planck-Institute for Extraterrestrial
Physics, and F. Strafella, Asiago Observatory, report: "High resolution
observations of SS 433 were made at the Cassegrainian focus of
the 182-cm Asiago telescope with a Fabry-Perot tilting spectrophotometer
(resolving power lambda/Delta-Lambda = 1.2**4, free spectral range 14.3 A).
The spectral region between 8453 and 8442 A was explored during the
nights 1978 Nov. 21, 22 and 23 and 1979 Mar. 16; the O I 8446 A line
seems to be split into many components in the red and blue regions.
Component velocities ranging from 50 to 250 km/s can be derived
with typical single-peak fluxes of 10**-13 erg s**-1 cm**-2 (which remained
practically constant during the observation periods).  Spectral
plates taken at Asiago by Ciatti and Marrinano in the same period
show the presence of a strong line around 8446 A with a width of
about 20 A."

     Y. Andrillat, Haute Provence Observatory, and J. P. Swings,
Institute of Astrophysics, University of Liege, communicate: "A
230-A/mm, near-infrared (8000-11000 A) spectrum of SS 433 was obtained
on July 20 with the Haute Provence 193-cm reflector and a
Cassegrainian image-tube spectrograph.  The observation (exposure
duration 4h30m) shows a continuum on which are superimposed emission
lines of He I 10 830 A (possibly with a hint of a P-Cyg structure),
and of the Paschen series (P7, P9 and P10), displaced by
+450 to +500km/s.  Neither O I 8446 A nor He II 10 123 A is visible
on our fairly low-quality spectrogram."

1979 August 17                 (3392)              Daniel W. E. Green

Read IAUC 3391  SEARCH Read IAUC 3393

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

Valid HTML 4.01!