J/ApJ/921/133ivo://CDS.VizieR/J/ApJ/921/133doi:10.26093/cds/vizier.19210133CDSTorres G.Vanderburg A.Curtis J.L.Kraus A.L.Gaidos E.2023-10-16T11:55:14Z2023-03-30T09:15:08ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryvisible-astronomyspectroscopyradial-velocityWe report follow-up spectroscopic observations of the 1.62 day, K-type, detached, active, near-circular, double-lined eclipsing binary EPIC 219511354 in the open cluster Ruprecht 147, identified previously on the basis of photometric observations from the Kepler/K2 mission. This is the fourth eclipsing system analyzed in this cluster. A combined analysis of the light curve and radial velocities yields accurate masses of M_Aa_=0.912+/-0.013M_{sun}_ and M_Ab_=0.822+/-0.010M_{sun}_ for the primary (star Aa) and secondary (Ab), along with radii of R_Aa_=0.920+/-0.016R_{sun}_ and R_Ab_=0.851+/-0.016R_{sun}_, and effective temperatures of 5035+/-150 and 4690+/-130K, respectively. Comparison with current models of stellar evolution for the known age and metallicity of the cluster reveals that both radii are larger (by 10%-14%) and both temperatures cooler (by ~6%) than theoretically predicted, as is often seen in M dwarfs. This is likely caused by the significant stellar activity in the system, manifested here by 6% peak- to-peak out-of-eclipse variability, a filled-in H{alpha} line, and its detection as an X-ray source. We also find EPIC 219511354 to be a hierarchical triple system, with a low-mass tertiary in an eccentric 220 day orbit.2021ApJ...921..133Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/133CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)J/AJ/124/1144 : Orbits of single-lined spectroscopic binaries (Latham, 2002)J/A+A/450/681 : Companions to close sp. binaries (Tokovinin+, 2006)J/ApJ/662/602 : Radial velocities of HD 110555 (Torres+, 2007)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)J/AJ/145/134 : RVels of 108 stars in Ruprecht 147 (Curtis+, 2013)J/MNRAS/454/2863 : Teff against colours calibrations (Huang+, 2015)J/AJ/152/8 : Stellar multiplicity on planetary systems I. (Kraus+, 2016)J/ApJS/222/14 : Planetary cand. from 1st yr K2 mission (Vanderburg+, 2016)J/A+A/619/A176 : Chemical composition of Ruprecht 147 (Bragaglia+, 2018)J/AJ/155/173 : K2 light curve for K2-231 (Curtis+, 2018)J/ApJ/887/109 : EBs in Ruprecht 147. II. EPIC 219568666 (Torres+, 2019)J/ApJ/904/140 : Ruprecht 147 members & 5 other cl. (Curtis+, 2020)J/ApJ/896/162 : EBs in Ruprecht 147. III. EPIC 219552514 (Torres+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/921/133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/133https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/921/133/table1Detrended K2 photometry of EPIC 219511354RFluxF[0.58/1.03] Flattened residual flux (1)stat.fit.residual;phot.fluxdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[57301.48/57382.81] Barycentric Julian Date; BJD-2400000dtime.epochdoubleRFluxNF[0.59/1.01] Not Flattened residual flux (1)stat.fit.residual;phot.fluxdoubleJ/ApJ/921/133/table2Heliocentric Radial Velocity Measurements of EPIC 219511354recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[57297.69/59384.9] Barycentric Julian Date; BJD-2400000dtime.epochdoubleRVAa[-62.1/151.5] Radial velocity of component Aakm/sphys.veloc;pos.heliocentricfloate_RVAa[1.26/2.15] RVAa uncertaintykm/sstat.errorfloatRVAb[-72.2/157.4] Radial velocity of component Abkm/sphys.veloc;pos.heliocentricfloate_RVAb[2.03/3.5] RVAb uncertaintykm/sstat.errorfloatInner[0.11/0.95] Inner phasetime.phasefloatOuter[0.12/1] Outer phasetime.phasefloat