Central Bureau for Astronomical Telegrams
IAUC 3904: Obs TO BE COORDINATED WITH TENMA; V0332+53
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Read IAUC 3905
Circular No. 3904
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
OBSERVATIONS TO BE COORDINATED WITH TENMA
F. Makino, Institute of Space and Astronautical Science,
Tokyo, telexes: "Coordinated simultaneous observations of the BL
Lac object Mkn 421 at wavelengths from x-rays to radio will be
conducted during 1984 Jan. 22-30 and Mar. 1-10. TENMA and IUE
will observe at x-ray and ultraviolet wavelengths, and optical and
radio observations will be undertaken at the University of Tokyo's
Okayama and Nobeyama observatories; the U.K. Infrared Telescope in
Hawaii will possibly make infrared observations. TENMA will also
be observing NGC 4151 during Jan. 19-21. Simultaneous data at
other wavelengths would be valuable. Contact me for a detailed
program (telephone 81-3-467-1111, telex Japan 24550 SPACETKY J)."
V0332+53
P. M. Williams, P. W. J. L. Brand, S. J. Bell Burnell and
A. S. Webster, U.K. Infrared Telescope Unit, Edinburgh University
and Royal Observatory, Edinburgh, report that observations made on
Dec. 23 of the infrared counterpart (the infrared position of
which is R.A. = 3h31m14s9, Decl. = +53deg00'25" , equinox 1950.0) of this
x-ray transient show the infrared fluxes to have increased since the
previous observation on Nov. 23 (when it was also flaring at x-ray
wavelengths). J has brightened by 0.8 mag, H and K by ~ 0.1 mag.
Immediate optical observations are strongly needed.
S. A. Ilovaisky and C. Chevalier, Observatoire de Besancon,
telex: "Preliminary results of photoelectric observations of the
only star within the EXOSAT error box for this transient source
(IAUC 3893), obtained during Nov. 28.8-Dec. 7.8 UT with the 1.9-m
reflector and a high-speed photometer at the Haute Provence
Observatory, reveal no obvious photometric variations with amplitudes
larger than +/- 0.03 mag (3-sigma) over timescales from minutes to
the entire length of the observing run. The decline of the x-ray
flux by a factor of two from Nov. 20-21 to Nov. 25 (private
communication from J. Davelaar, EXOSAT Observatory), together with the
optical constancy of the star only a few days later, suggest a
transient Be massive binary system with a collapsed companion/
accretion disk similar to those in Cyg X-1 and GX 339-4."
P. L. Bernacca, Asiago Astrophysical Observatory, provides
the following improved results for the photometric observations on
Nov. 29 and 30 (cf. IAUC 3897): V = 15.13, B-V = +2.31.
1983 December 30 (3904) Brian G. Marsden
Read IAUC 3905
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