J/A+A/654/A17ivo://CDS.VizieR/J/A+A/654/A17doi:10.26093/cds/vizier.36540017CDSClaret A.Gimenez A.Baroch D.Ribas I.Morales J.C.Anglada-Escude G.2021-12-03T12:41:41Z2021-10-01T08:17:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starsThe measurement of apsidal motion rates in eccentric eclipsing binaries is a unique way to gain insight into the internal structure of stars through the internal density concentration parameter,k2. High-quality physical parameters of the stellar components,together with precise measurements of the advance of the periastron, are needed for the comparison with values derived from models. As a product of the TESS mission, high-precision light curves of a large number of eclipsing binaries are now available. Using a selection of well-studied, double-lined eccentric eclipsing binary systems, we aim to determine their apsidal motion rates and place constraints on the internal density concentration and compare with the predictions from state-of-the-art theoretical models. We compute times of minimum light using the TESS light curves of 34 eclipsing binaries with precise absolute parameters. We use the changing difference over time between primary and secondary eclipse timings to determine the apsidal motion rate. To extend the time baseline, we combine the high-precision TESS timings with reliable archival data. On the other hand, for each component of our sample of double-lined eclipsing binaries we computed grids of evolutionary stellar models for the observed stellar mass exploring ranges of values of the overshooting parameter, fov, the mixing-length parameter and the metallicity. To find the best solution for the two components we adopt a chi-squared statistic to infer the optimal values of the overshooting parameter and the mixing-length parameter. The theoretical internal structure constants to be compared with the observed values were calculated by integrating the differential equations of Radau for each stellar model. We have determined the apsidal motion rate of 27 double-lined eclipsing binaries with precise physical parameters. The obtained values, corrected for their relativistic contribution, yield precise empirical parameters of the internal stellar density concentration. The comparison of these results with the predictions based on new theoretical models shows very good agreement. Small deviations are identified but remain within the observational uncertainties and the path for a refined comparison is indicated.2021A&A...654A..17Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/654/A17CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/649/A64 : TESS time of eclipse of 15 eclipsing binaries (Baroch+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/654/A17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/654/A17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/654/A17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/654/A17https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/654/A17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/654/A17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/654/A17/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A17/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A17/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A17/stars?GETtext/xml+votable180.050000true124.69791670.28350.0055555555555555566/1753 3049 3168 12911 13281 13705 13819 14173 14308 14630 14644 15195 15686 15803 16096 20803 21492 21526 21866 22249 22980 25074 28687 32217 34914 35055 37357 37923 38562 40545 42071 42674 42791 43152https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/654/A17?format=asciidefaultJ/A+A/654/A17/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the systemmeta.id;meta.maincharRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000)pos.eq.dec;meta.mainNNumber of measurements in table2.datmeta.numberintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/654/A17/table2T2-T1 from TESSe_T2-T1rms uncertainty in T2-T1dstat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the systemmeta.id;meta.mainchart0Reference time used to compute orbital cycledtime.epochdoubleNOrbital cyclemeta.idintT2-T1Time difference between primary and secondary eclipsedtime.epoch;arith.diffdoubledN[-2/1] Cycle difference between primary and secondary eclipsesmeta.numberint