2012A&A...539A.139T

We present a spectroscopic and photometric analysis of the multiple system and early-type eclipsing binary SZCam (O9IV+B0.5V), which consists of an eclipsing SB2 pair of orbital period P=2.7-days in a long orbit (∼55yrs) around a non-eclipsing SB1 pair of orbital period P=2.8-days. We have reconstructed the spectra of the individual components of SZCam from the observed composite spectra using the technique of spectral disentangling. We used them together with extensive and accurate B V I_C CCD photometry to obtain an orbital solution. Our photometry revealed the presence of a βCep variable in the SZCam hierarchical system, probably located within the non-eclipsing SB1 pair. The pulsation period is (0.33265±0.00005)days and the observed total amplitude in the B band is (0.0105±0.0005)mag. NLTE analysis of the disentangled spectra provided atmospheric parameters for all three components, consistent with those derived from orbital solution.