2005A&A...429..631F

object{HD 92024} is a member of the open cluster NGC 3293; it is the only eclipsing binary system with a β Cephei component known in the southern hemisphere. This paper presents the first spectroscopic analysis of the single-lined binary and provides an orbital analysis based on recent high-resolution spectroscopy and photometry. A procedure to derive orbital elements with minimal influence of the pulsational line-profile variations on the radial velocities is applied, and we find the stellar masses to be 15.0^+3.0_–4.0M_☉ and 3.0±0.5M_☉ respectively, and radii of 8.4±0.8R_☉, 2.1±0.4R_☉. The temperatures are 25500±500K and 12500±1000K. The surface gravity values of logg= 3.77±0.08 and 4.27±0.18 indicate that the binary consists of an evolved early B-type primary and a late-B main sequence companion. The resulting distance 2.8±0.3kpc and systemic velocity -16km/s confirm cluster membership. Theoretical stellar models indicate an age of 10-13Myr, somewhat higher than the literature value for the brightest members of NGC 3293.