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We estimate the mass of the compact object in the gamma-ray binariesLSI+61303 and MWC 148, using the latest data for the inclination, orbitalmotion and assuming that the orbital plane coincides with the equatorial planeof the Be star. For LSI+61303 we find the mass of the compact object to be mostlikely in the range 1.3 M_sun < M_2 < 2.0 M_sun, which means that it isprobably a neutron star. For MWC 148, we find the mass of the compact object ina higher range, 2.1 M_sum < M_2 < 7.3 M_sun, which increases the chances forthis system to host a black hole companion.

Mass of the compact object in the Be/gamma-ray binaries LSI+61303 and MWC 148