J/A+A/627/A153ivo://CDS.VizieR/J/A+A/627/A153doi:10.26093/cds/vizier.36270153CDSIglesias-Marzoa R.Arevalo M.J.Lopez-Morales M.Torres G.Lazaro C.,Coughlin J.L.2019-10-16T14:46:55Z2019-07-17T07:59:32ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsradial-velocityphotometryLow-mass stars in eclipsing binary systems show radii larger and effective temperatures lower than theoretical stellar models predict for isolated stars with the same masses. Eclipsing binaries with low-mass components are hard to find due to their low luminosity. As a consequence, the analysis of the known low-mass eclipsing systems is key to understand this behavior. We aim to investigate the mass-radius relation for low-mass stars and the cause of the deviation of the observed radii in low-mass detached eclipsing binary stars (LMDEB) from theoretical stellar models. We developed a physical model of the LMDEB system NSVS 10653195 to accurately measure the masses and radii of the components. We obtained several high-resolution spectra in order to fit a spectroscopic orbit. Standardized absolute photometry was obtained to measure reliable color indices and to measure the mean Teff of the system in out-of-eclipse phases. We observed and analyzed optical VRI and infrared JK band differential light-curves which were fitted using PHOEBE. A Markov-Chain Monte Carlo (MCMC) simulation near the solution found provides robust uncertainties for the fitted parameters. NSVS 10653195 is a detached eclipsing binary composed of two similar stars with masses of M1=0.6402+/-0.0052M_{sun}_ and M2=0.6511+/-0.0052M_{sun}_ and radii of R1=0.687^+0.017^_-0.024_R_{sun}_ and R2=0.672^+0.018^_-0.022_R_{sun}_. Spectral types were estimated to be K6V and K7V. These stars rotate in a circular orbit with an orbital inclination of i=86.22+/-0.61 degrees and a period of P=0.5607222(2)d. The distance to the system is estimated to be d=135.2^+7.6^_-7.9_pc, in excellent agreement with the value from Gaia. If solar metallicity were assumed, the age of the system would be older than log(age)~8 based on the M_bol_-logTeff diagram. NSVS 10653195 is composed of two oversized and active K stars. While their radii is above model predictions their Teff are in better agreement with models.2019A&A...627A.153Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/627/A153CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/627/A153https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/627/A153http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/627/A153https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/627/A153https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/627/A153http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/627/A153GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/627/A153/table1VRI differential photometry from SARA 0.9mFilter[VRI] Filtermeta.id;instr.filterchare_dmagUncertainty in differential magnitudemagstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubledmagDifferential magnitudemagphot.mag;arith.difffloatJ/A+A/627/A153/table2JK differential photometry from TCSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubledmagDifferential magnitudemagphot.mag;arith.difffloate_dmagUncertainty in differential magnitudemagstat.error;phot.magfloatAirmassAirmassobs.airMassfloatFilter[JK] Filtermeta.id;instr.filtercharJ/A+A/627/A153/table3Radial velocity measurements from TRESrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleRV1Primary radial velocitykm/sspect.dopplerVelocfloate_RV1Uncertainty in primary radial velocitykm/sstat.errorfloatRV2Secondary radial velocitykm/sspect.dopplerVelocfloate_RV2Uncertainty in secondary radial velocitykm/sstat.errorfloatPhasePhotometric phasetime.phasefloatJ/A+A/627/A153/table7Eclipse times from literature and IR photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of minimumdtime.epochdoublee_HJDUncertainty in HJDdstat.error;time.epochdoubleType[P/S] Type of minimum (Primary, P, or Secondary, S)meta.codecharRef[1/10] Reference (1)meta.ref;pos.frameint