ABSOLUTE DIMENSIONS AND MASSES OF YY SAGITTARII AND V526 SAGITTARII

Accurate masses and radii have been determined from new spectroscopic observations and previously published photometric orbits of YY Sgr (B5 +B6) and V526 Sgr (B9.5+A2), two Southern eclipsing binaries with ecce ntric orbits and measured apsidal rotation. The measured properties, i ncluding apsidal rotation rate, are compared with recent theoretical p redictions. The models indicate ages near 30 million and 200 million y ears for YY Sgr and V526 Sgr, respectively. The agreement between theo ry and observations is not entirely satisfactory for V526 Sgr. (C) 199 7 American Astronomical Society.