Radius, rotational period and inclination of the Be stars in the Be/gamma-ray binaries MWC 148 and MWC 656

Using TESS photometry and Rozhen spectra of the Be/gamma-ray binaries MWC 148 and MWC 656, we estimate the projected rotational velocity ($ {v} sin i$), the rotational period (P$_{rm rot}$), radius (R$_{rm 1}$), and inclination ($i$) of the mass donor. For MWC 148 we derive P$_{rm rot} = 1.10 pm 0.03$~d, R$_{rm 1}= 9.2 pm 0.5$~R$_odot$, $i = 40^circ pm 2^circ$, and $ {v} sin i =272 pm 5$~km~s$^{-1}$. For MWC 656 we obtain P$_{rm rot} = 1.12 pm 0.03$~d, R$_{rm 1}= 8.8 pm 0.5$~R$_odot$, $i = 52^circ pm 3^circ$, and $ {v} sin i =313 pm 3$~km~s$^{-1}$. For MWC 656 we also find that the rotation of the mass donor is coplanar with the orbital plane.