Central Bureau for Astronomical Telegrams
IAUC 3392: Poss. X-RAYS FROM MXB1730-333; SS 433
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Circular No. 3392
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
POSSIBLE X-RAYS FROM MXB1730-333
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
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