Recent progress has been made to address this: (1) the discovery that gamma Cas is an eccentric binary system (P = 203.59 d) with unknown secondary type, (2) the accumulation of RXTE data at 9 epochs in 1996 - 2000, and (3) the collation of robotic telescope B, V -
band photometric observations over 4 seasons.
High precision
photometric observations were obtained in g», r», i», and z»
band simultaneously, using the new GROND detector, mounted on the MPI / ESO 2.2 m telescope at La Silla.