摘要：We present the results from a combined spectroscopic and photometric in-depth study of the binary system BD+11 o 3569 (B4 V + B5 V). Fits to Johnson V, Cousins R C and I C photometry, and radial velocities yield an orbital period of 1.49712598±0.00000020 days and an inclination of 82°.93±0°.17. The combined light curves and radial velocity solution give masses and radii of M 1 =5.259±0.064M e with M 2 =4.325±0.040M e and R 1 =3.509±0.018R e with R 2 =2.570±0.023R e . We find that the system does not match a single age isochrone when derived astrophysical quantities for the components are compared with theoretical stellar models, but are bounded by 32 and 40 Myr isochrones. We estimate a distance to the system of 1130±150 pc, which agrees reasonably with the published Gaia distance.
关键词：binaries: eclipsing;binaries: spectroscopic;stars: early-type;stars: fundamental parameters;stars: individual (BD+11 3569)
