We conducted spectroscopic and photometric observations of the optical companion of the X-ray transient RX J0117.6 - 7330 in the Small Magellanic Cloud , during a quiescent state .
The primary star is identified as a B 0.5 IIIe with a mass M _ { * } = ( 18 \pm 2 ) M _ { \odot } and bolometric magnitude M _ { \mbox { { \scriptsize bol } } } = -7.4 \pm 0.2 .
The main spectral features are strong H \alpha emission , H \beta and H \gamma emission cores with absorption wings , and narrow He I and O II absorption lines .
Equivalent width and full width at half maximum of the main lines are listed .
The average systemic velocity over our observing run is v _ { r } = ( 184 \pm 4 ) km { s } ^ { -1 } ; measurements over a longer period of time are needed to determine the binary period and the K velocity of the primary .
We determine a projected rotational velocity v \sin i = ( 145 \pm 10 ) km { s } ^ { -1 } for the Be star , and we deduce that the inclination angle of the system is i = ( 21 \pm 3 ) \deg .