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${}_{\mathrm{r}\mathrm{o}\mathrm{t}}$), radius (R${}_1$), and inclination ($i$) of the mass donor. For MWC 148 we derive P${}_{\mathrm{r}\mathrm{o}\mathrm{t}}=1.10\pm 0.03$~d, R${}_1=9.2\pm 0.5$~R${}_{\odot }$, $i={40}^{\circ }\pm 2^{\circ }$, and $ {v} \sin i =272 \pm 5$kms$^{-1}$\mathrm{.}ForMWC656weobtainP${\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$kms$^{-1}$. For MWC 656 we also find that the rotation of the mass donor is coplanar with the orbital plane.