J/AJ/165/247ivo://CDS.VizieR/J/AJ/165/247doi:10.26093/cds/vizier.51650247CDSPan Y.Zhang X.2025-05-19T20:08:54Z2024-01-26T08:50:08ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsmultiple-starsvisible-astronomyspectroscopyradial-velocityWe present comprehensive photometric and spectroscopic study of the short-period eclipsing binary KIC7284688 based on the Kepler, TESS, and LAMOST data. The radial-velocity analysis indicates that it is a triple-lined system composed of a nearly equal-mass binary plus a line-of-sight star. The masses and radii of the components in the binary are measured to be M1=1.142{+/-}0.020M{sun}, R1=1.204{+/-}0.051R{sun}, and M2=1.119{+/-}0.019M{sun}, R2=1.149{+/-}0.052R{sun}. In addition to the eclipses, the light curves of the binary exhibit exhibit rapidly changing O'Connell effect, namely the inequality in light maxima, which could be attributed to the asynchronous rotation of the starspots. We analyzed the variability in the data of light residuals, the difference between light maxima (Max.I-Max.II) as well as the epochs of light minima and determined a rotation period of 0.644 days. Moreover, we detected a quasiperiod with ~213days from both the data of (Max.I-Max.II) and light times of minima, which is almost identical to the beat between the rotation period (~0.644days) and the orbital period (~0.646days). We conclude that the quasiperiodic variations of the O'Connell on the system are probably related to the starspot migration and this is a very rapid variation compared to the magnetic cycles with timescales ranging from years to decades.2023AJ....165..247Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/247CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/AJ/141/83 : Kepler Mission. I. Eclipsing binaries in DR1 (Prsa+, 2011)J/AJ/142/160 : Kepler Mission. II. Eclipsing binaries DR2 (Slawson+, 2011)J/AJ/147/45 : Kepler mission. IV. Eclipse times close bins (Conroy+, 2014)J/MNRAS/448/429 : Starspots in short-period Kepler binaries (Balaji+, 2015)J/ApJS/220/19 : LAMOST obs. in the Kepler field. I. (De Cat+, 2015)J/ApJS/224/37 : White-light flares on close binaries from Kepler (Gao+, 2016)J/AJ/151/68 : Kepler Mission. VII. Eclipsing binaries in DR3 (Kirk+, 2016)J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)J/AJ/154/250 : Kepler EB classifications and rotation periods (Lurie+, 2017)J/AJ/153/231 : BVR photometry of EPIC 211957146 (Sriram+, 2017)J/ApJS/238/30 : LAMOST obs. in Kepler field. II. LRS sp. 5yrs (Zong+, 2018)J/ApJ/877/75 : BVRI photom. of DV Psc and known short-period EBs (Pi+, 2019)J/ApJS/251/15 : LAMOST-Kepler/K2 survey first year obs. (Zong+, 2020)J/AJ/161/46 : (O-C) curve of the binary system KIC 06852488 (Shi+, 2021)J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)J/A+A/664/A78 : Kepler targets class based on LAMOST spectra (Frasca+, 2022)J/ApJS/262/10 : Kepler eclipsing binaries with Gaia data (Knote+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/247https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/247http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/247https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/247https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/247http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/247GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/165/247/table1KIC 7284688 radial-velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[8263/9017] Barycentric Julian Date; BJD-2450000dtime.epochdoublePorb[0.008/0.99] Orbital phasetime.phasefloatRVel1[-143/151]? 1st companion radial velocitykm/sspect.dopplerVelocfloatnullablee_RVel1[1/16]? Error on RVel1km/sstat.errorfloatnullableRVel2[-164/152]? 2nd companion radial velocitykm/sspect.dopplerVelocfloatnullablee_RVel2[1/17]? Error on RVel2km/sstat.errorfloatnullableRVel3[0.18/8.11] 3rd companion radial velocitykm/sspect.dopplerVelocfloate_RVel3[0.1/1]? Error on RVel3km/sstat.errorfloatnullable