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IAUC 3594: N CrA 1981; GX 339-4 = 4U 1658-48; 1981 CW

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IAUC number 

                                                  Circular No. 3594
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


NOVA CORONAE AUSTRINAE 1981
     J. Mattei, AAVSO, communicates the following visual magnitude
estimates: Apr. 11.08 UT, 9.1 (D. Overbeek, Edenvale, South Africa);
12.10, 9.1 (Overbeek); 14.51, 9.2 (J. Morgan, Prescott, AZ).
     M. Oda and the Hakucho Team, University of Tokyo, telex that
observations during Apr. 11-13 UT show that the x-ray flux of the
nova was below the Hakucho detection limit of ~ 10 Uhuru cts/s.


GX 339-4 = 4U 1658-48
     Oda and the Hakucho Team also report that this object, a suggested
black-hole candidate (Grindlay 1979, Ap. J. 232 L33), was
observed from Hakucho during Apr. 7.4-9.8 UT.  Preliminary data indicate
the x-ray luminosity was low (see also IAUC 3586), with an
intensity upper limit of 30 Uhuru cts/s.  Hakucho will make occasional
observations of this source again during May-July.  Optical
observations during the x-ray faint state are important.
     A. B. Giles, University of Tasmania; and D. J. Adams, University
of Leicester, report the following infrared observations, made
with the Anglo-Australian Telescope: 1980 Apr. 24.75 UT, J = 15.07
+/- 0.03, H = 14.81 +/- 0.05, 14.42 +/- 0.05; 25.78, 15.54 +/- 0.13, 15.10
+/- 0.19, 14.49 +/- 0.20.  Comparison of the TV finder with the ESO-B
plate finder chart suggested B ~ 18 at the time, as has been historically
more usual for the source.  The infrared excess supports
a stellar-wind mass-loss model.


1981 CW
     The following precise positions have been measured by C.-Y.
Shao from exposures by J. Bulger and himself at the Agassiz
Station:

     1981 UT             R. A. (1950) Decl.       Mag.
     Apr.  3.03935     8 52 46.92   +28 45 46.8   17
           4.04006     8 56 06.58   +28 30 28.7
           7.13781     9 05 12.80   +27 41 32.4

     The resulting elements (cf. IAUC 3588) are: T = 1981 Feb. 2, Peri. = 15o,
Node = 107o, Incl. = 4o.8, q = 1.19 AU, e = 0.37.  Ephemeris continuation:
Apr. 16.0, R.A.  = 9h33m.6, Decl. = +25o11' (equinox 1950.0); 26.0,
1Oh01m.9 +22o08'; May 6.0, 10h28m.0, +19o01'; 16.0, 10h5m.12; +15o53'.


1981 April 16                  (3594)              Brian G. Marsden

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