CCD photometry of low mass X-ray binaries - LMCX-2, 1556-60 and 1957 + 11

Astronomy and Astrophysics – Astronomy

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Charge Coupled Devices, Stellar Mass, Stellar Spectrophotometry, X Ray Binaries, Light Curve, Orbital Elements, Periodic Variations, Spectral Energy Distribution, Visible Spectrum

Scientific paper

Preliminary results are presented from V-band CCD photometric observations of several low-mass X-ray binaries with faint optical counterparts that were obtained at ESO and CFHT from February to September 1984. LMCX-2 exhibits large (0.3-0.5 magnitude) variations consistent with a possible 6.4-hour period. 1556-605 shows 0.2-0.5 magnitude variations suggesting that the orbital period is longer than 7 hours. 1957 + 115 shows short time scale (1 hour) variations of 0.1 magnitude.

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