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In this paper we present the first results of a detailed spectroscopic andphotometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5.With the FIES spectrograph at the Nordic Optical Telescope we have obtained aseries of high-resolution spectra (R=47000) covering the entire orbit of thesystem. In addition we obtained simultaneous broadband photometry from threesmall aperture telescopes. From these spectroscopic and photometric data wehave derived the system's orbital parameters and determined the fundamentalstellar parameters of the two components. Our results indicate that ASASJ052821+0338.5 is a K1/K3 pre-main-sequence eclipsing binary, with componentmasses of 1.38 M_sun and 1.33 M_sun and a period of 3.87 days, located at adistance of 280 +/- 30 pc. The kinematics, physical location and theevolutionary status of the two stars suggest that ASAS J052821+0338.5 is amember of the approximately 11 Myr old Orion OB1a subassociation. The systemsalso exhibits smooth 0.15m out-of-eclipse variations that are similar to thosefound in RS CVn binaries. Furthermore the parameters we derived are consistentwith the 10-13 Myr isochrones of the popular Baraffe stellar evolutionarymodels.

The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5