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We present and analyze the optical photometric and spectroscopic data of theBe/X-ray binary MXB 0656-072 from 2006 to 2009. A 101.2-day orbital period isfound, for the first time, from the present public X-ray data(Swift/BAT andRXTE/ASM). The anti-correlation between the H$\alpha$ emission and the $UBV$brightness of MXB 0656$-$072 during our 2007 observations indicates that a massejection event took place in the system. After the mass ejection, a low-densityregion might develop around the Oe star. With the outward motion of thecircumstellar disk, the outer part of the disk interacted with the neutron stararound its periastron passage and a series of the X-ray outbursts weretriggered between MJD 54350 and MJD 54850. The PCA--HEXTE spectra during the2007-2008 X-ray outbursts could be well fitted by a cut-off power law with lowenergy absorption, together with an iron line around 6.4 keV, and a broadcyclotron resonance feature around 30 keV. The same variability of the soft andhard X-ray colors in 2.3-21 keV indicated that there were no overall changes inthe spectral shape during the X-ray outbursts, which might be only connectedwith the changes of the mass-accretion rate onto the neutron star.

Multi-wavelength study of the Be/X-ray binary MXB 0656-072