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We studied the average orbital modulation of various parameters (gamma-rayflux, H-alpha emission line, optical V band brightness) of the radio- andgamma-ray emitting Be/X-ray binary LSI+61303. Using the Spearman rankcorrelation test, we found highly significant correlations between the orbitalvariability of the equivalent width of the blue hump of the H-alpha andFermi-LAT flux with a Spearman p-value 2e-5, and the equivalent widths ratioEW_B/EW_R and Fermi-LAT flux with p-value 9e-5. We also found a significantanti-correlation between Fermi-LAT flux and V band magnitude with p-value7.10^{-4}.  All these correlations refer to the average orbital variability, and weconclude that the H-alpha and gamma-ray emission processes in LSI+61303 areconnected. The possible physical scenario is briefly discussed.

Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303