The Orbital Period Of The Su Ursae Majoris Star Ak Cancri

A time resolved spectroscopic study of the SU UMa subtype dwarf nova AK Cancri is presented. An orbital period of P-orb = 0.(d)0651(2) and a radial velocity half-amplitude of K = 50(3) km s(-1) were obtained from the radial velocity variations of the H alpha emission line. Assuming various observational constraints, we deduced a most likely mass ratio of q = 0.28 +/- 0.02 and stellar masses of M(1) = 0.41 +/- 0.03M. and M(2) = 0.1135 +/- 0.0002M., for the primary and secondary star, respectively. In addition, the dynamical solution indicates a low orbital inclination (i = 36 degrees +/- 3 degrees).