Pulsations and long term variability of the second eclipsing HMXB in M 33

We propose 11 observations with about 3.4 day spacing of the second eclipsinghigh mass Xray binary in M33. We will search for pulsations of the source downto 200ms and for an expected long term modulation of the source similar to the35 day cycle of Her X1. The results will allow us to decide whether the compactobject in the system is a neutron star or a black hole. The Doppler delay curveof pulsations, if present, combined with the well determined orbital periodcould provide the mass function of the system. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]