Possible Optical Counterpart for LMC X-4

M. W. Pakull, Hamburg Observatory, Bergedorf, communicates: "A star located at R.A. = 5h32m44s, Decl. = -66o23'.9 (equinox 1950.0), No. D 35 on the map by Westerlund (1960, Ann. Uppsala Astron. Obs. 4, No. 7), is just outside the error circle of LMC X-4 (cf. IAUC 2936). Blue image-tube spectrograms (dispersion 150 A/mm) obtained at the European Southern Observatory suggest a composite spectrum of an early type star and a very late type star; a red image-tube spectrogram obtained by Olander suggests a late K or even M star. UBV photometry during November gives V = 13.20, B-V = +1.05, U-B = -0.30. Comparison with earlier measurements made with the same system in April-May reveals the object now to be 0.3 magnitude fainter in V, while no clear variation has been found in B and U."