标题：Accurate stellar parameters and distance to two evolved eclipsing binary systems, OGLE-BLG-ECL-123903 and OGLE-BLG-ECL-296596, towards the Galactic bulge
摘要：Aims.Our aim is to obtain high-accuracy measurements of the physical and orbital parameters of two evolved eclipsing binary systems, and to use these measurements to study their evolutionary status. We also aim to derive the distances to the systems by using a surface brightness–colour relation and compare these distances with the measurements provided byGaia.Methods.We measured the physical and orbital parameters of both systems based onV-band andI-band photometry from OGLE, near-infrared photometry obtained with the NTT telescope and the instrument SOFI, as well as high-resolution spectra obtained at ESO 3.6m/HARPS and Clay 6.5/MIKE spectrographs. The light curves and radial-velocity curves were analysed with the Wilson–Devinney code.Results.We analysed two double-lined eclipsing binary systems OGLE-BLG-ECL-123903 and OGLE-BLG-ECL-296596 from the Optical Gravitational Lensing Experiment (OGLE) catalogue. Both systems have a configuration of two well-detached giants stars. The masses of the components of OGLE-BLG-ECL-123903 areM1 = 2.045 ± 0.027 andM2 = 2.074 ± 0.023 M⊙and the radii areR1 = 9.540 ± 0.049 andR2 = 9.052 ± 0.060 R⊙. For OGLE-BLG-ECL-296596, the masses areM1 = 1.093 ± 0.015 andM2 = 1.125 ± 0.014 M⊙, while the radii areR1 = 18.06 ± 0.28 andR2 = 29.80 ± 0.33 R⊙. Evolutionary status was discussed based on the isochrones and evolutionary tracks fromPARSECandMESAcodes. The ages of the systems were established to be around 1.3 Gyr for the OGLE-BLG-ECL-123903 and 7.7 Gyr for the OGLE-BLG-ECL-296596. We also determined the distance to both systems. For OGLE-BLG-ECL-123903 this is equal tod = 2.95 ± 0.06 (stat.) ±0.07 (syst.) kpc, while for the OGLE-BLG-ECL-296596 it isd = 5.68 ± 0.07 (stat.) ±0.14 (syst.) kpc. This is the first analysis of its kind for these unique evolved eclipsing binary systems.
关键词：enbinaries: eclipsingbinaries: spectroscopicstars: fundamental parametersstars: individual: OGLE-BLG-ECL-123903stars: individual: OGLE-BLG-ECL-296596
