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IAUC 3543: 4U 0115+63; Cyg X-3; OPTICAL CANDIDATE FOR LMC X-1; 1980g

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IAUC number 

                                                  Circular No. 3543
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


4U 0115+63
     G. A. Kriss, L. Cominsky and R. Remillard, Massachusetts
Institute of Technology, write: "Spectrophotometric observations with
the 1.3-m telescope at the McGraw-Hill Observatory show an increase
in brightness of nearly two magnitudes of the optical counterpart
of 4U 0115+63 (cf. Johns et al. 1978, IAUC 3171).  Results from
1980 Sept. 24 indicate mv ~ 15.3, one magnitude brighter than that
reported in Aug. by Middleditch et al. (IAUC 3510).  Observations
made on Oct. 27, 30 and 31, and Nov. 4 give mv ~ 14.5.  X-ray
observations made by S. Rappaport with the Einstein Observatory on Aug.
19 failed to detect any x-ray emission above 1.5 x 10**-13 erg cm**-2
s**-1 in the 0.l-to-3-keV band.  Given the strong subsequent increase
in optical flux, however, we would urge new x-ray observations and
continued monitoring of the optical flux from this system."


CYGNUS X-3
     M. J. Coe, Physics Department, Southampton University, telexes:
"The Astrophysics Group, Southampton University, report that
monitoring of Cyg X-3 at 10.7 GHz from Chilbolton (U.K.) revealed
emission at the 600-mJy level at 16h.00 UT on Nov. 16; the emission
decayed within 30 min.  The source is obviously still active after
the major outburst on Sept. 26 (cf. IAUC 3522)."


OPTICAL CANDIDATE FOR LMC X-1
     J. B. Hutchings, A. P. Cowley and D. Crampton, Dominion
Astrophysical Observatory, communicate: "Optical spectra obtained at
Cerro Tololo Interamerican Observatory of the star 6" southwest of R
148 (cf. IAUC 3472) show extremely variable emission at 468.6 nm,
narrow Balmer absorption and variable He I and He II absorption.
Radial velocities of H and He II 468.6 nm vary over ~ 50 km/s from
night to night, and the line intensities vary within a few hours.
Photometry and further spectroscopy of the object are desirable."


PERIODIC COMET STEPHAN-OTERNA (1980g)
     Total visual magnitude estimates: Nov. 3.00 UT, 9.3 (G. S.
Keitch, Wrington, Eng., 20 x 80 binoculars); 9.36, 9.0 (D. Machholz,
San Jose, CA, 0.25-m reflector); 12.00, 9.2 (Keitch); 17.39, 8.8 (J.
Bortle, Stormville, NY, 20 x 80 binoculars); 19.40, 8.5 (Bortle).


1980 November 24               (3543)              Daniel W. E. Green

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