J/AJ/170/331ivo://CDS.VizieR/J/AJ/170/331CDSBaum A.C.Pepper J.Davenport J.R.A.Howell S.B.2026-09-02T08:46:05Z2026-09-02T08:57:50ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryvisible-astronomymultiple-starsA set of eclipsing binary systems exhibit a changing inclination over time due to the gravitational influence of a third stellar companion. These changing inclinations manifest in photometric observations over time as eclipse depth variations. To detect changing eclipse depths, it is advantageous to have a long time baseline of observations, which can be attained by combining data from multiple surveys. We collect ground-based photometry from the Kilodegree Extremely Little Telescope and space-based photometry from the Transiting Exoplanet Survey Satellite (TESS) for seven known changing-inclination eclipsing binaries: HS Hya, RW Per, IU Aur, AH Cep, SV Gem, V685 Cen, and SS Lac. We measure eclipse depth variations and eclipse timing variations in six systems; SS Lac no longer eclipses. As of observations presented here from TESS Sector 35, eclipses are no longer visible in HS Hya (as noted in J. R. A. Davenport et al. 2021). SV Gem, previously believed to have stopped eclipsing, exhibits eclipse-like features across all years of observation, as well as evidence of the negative "O'Connell Effect." We also present high-resolution speckle imaging from Gemini-North, Gemini-South, and the NESSI instrument on the WIYN telescope for RW Per, AH Cep, SV Gem, and SS Lac, none of which revealed a third companion. Speckle imaging of IU Aur from NESSI revealed the presence of a third companion at an angular separation of 0.14"; we report the details of this detection.2025AJ....170..331Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/331CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-)II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)J/A+A/403/675 : UBV light curves of IU Aur (Ozdemir+, 2003)J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Graczyk+, 2011)J/MNRAS/448/946 : Kepler eclipse timing variation analyses (Borkovits+, 2015)J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015)J/MNRAS/455/4136 : Kepler triples (Borkovits+, 2016)J/ApJ/836/177 : RVs and R-band obs. of the EB* V541 Cyg (Torres+, 2017)J/A+A/609/A46 : Light curves 0f 6 MC eclipsing binaries (Jurysek+, 2018)J/AJ/156/259 : Robo-AO detected close binaries in Gaia DR2 (Ziegler+, 2018)J/MNRAS/493/5005 : TICs 167692429 and 220397947 triple stars (Borkovits+, 2020)J/AJ/162/189 : 125 years light curve of HS Hydrae with DASCH (Davenport+, 2021)J/ApJS/262/10 : Kepler eclipsing binaries with Gaia data (Knote+, 2022)J/ApJS/258/16 : TESS Eclipsing Binary stars. I. Sectors 1-26 (Prsa+, 2022)J/AJ/165/81 : CHIRON RV of V907 Sco system components (Zasche+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/331https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/331http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/331https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/331https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/331http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/331GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/170/331/table2 (Eclipsing binary system observational properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/170/331/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/170/331/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/170/331/table2?GETtext/xml+votable180.050000true156.153133325-19.092535340830.0055555555555555566/1299 1628 14033 15713 24346 37941 40279https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/170/331?format=asciiOpticaldefaultJ/AJ/170/331/table2Eclipsing binary system observational propertiesSystemSystemmeta.id;meta.maincharTIC[2940839/468682885] TESS Input Catalog (IV/39) identifiermeta.idlongRA_ICRSHour of right ascension (ICRS) from Gaia DR3 (I/355)pos.eq.ra;meta.mainFig4meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDE_ICRSDegree of declination (ICRS) from Gaia DR3 (I/355)pos.eq.dec;meta.mainVmag[6.88/10.57] Out-of-eclipse V-band magnitude from Simbadmagphot.mag;em.optfloatTmag[6.67/10.18] Out-of-eclipse T-band magnitude from TIC (IV/39)magphot.mag;em.opt.RfloatTeff1[6500/32000] Effective temperatureKphys.temperature.effectiveinte_Teff1[50/1000]? Teff1 uncertaintyKstat.error;phys.temperature.effectiveintnullableTeff2[4000/28600]? Effective temperatureKphys.temperature.effectiveintnullablee_Teff2[50/1000]? Teff2 uncertaintyKstat.error;phys.temperature.effectiveintnullableRUWE[0.97/10.16] Renormalised unit weight error from Gaia DR3stat.errorfloatAEN[0.16/2.18] Astrometric excess noise from Gaia DR3masstat.fit.paramfloatsAEN[30.9/3180.1] AEN significancestat.fit.paramfloatCROWDSAP[0.91/1]? Approximate fraction of flux within the TESS aperture originating from the target star; from TICphot.flux;arith.ratiofloatnullableRefReference of the effective temperatures (1)meta.bibcharFig1KELT and TESS light curves in JPG format (Figure 1)meta.ref.urlcharFig11Eclipse time O-C vs. median time of observation in JPG format (Figure 11)meta.ref.urlcharnEclNumber of eclipse depth and timing measurements (link to Table 4)meta.numberintnullableJ/AJ/170/331/table4Eclipse depth and timing measurementsDepth[2e-4/0.69] Eclipse Depth (3)magsrc.var.amplitudefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSystemSystemmeta.id;meta.maincharYear[2006/2025] Observed Year (1)yrtime.epochintSectorTESS Sector (1)meta.id;obscharInstrMission (2)meta.id;instrcharTmed[2454057/2460762] Median observation time during the indicated year, BJD at TDBdtime.epochdoublee_Depth[1e-4/0.06] Uncertainty in Depthmagstat.error;src.var.amplitudefloatPhase[-0.021/0.015] Phase of primary eclipse minimum (4)time.phasefloate_Phase[0/0.009] Uncertainty in Phasestat.error;time.phasefloatJ/AJ/170/331/table6AH Cep TESS eclipse measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintYear[2019/2024] Observed Yearyrtime.epochintSectorTESS Sectormeta.id;obscharDepth[-0.017/-0.01] Eclipse Depth (1)magsrc.var.amplitudefloate_Depth[3e-4/5e-4] Uncertainty in Depthmagstat.error;src.var.amplitudefloatTmin[2458765/2460610] Measured time of primary eclipse minimum, BJD at TBD (1)dtime.epochdoublee_Tmin[2e-4/1.4e-3] Uncertainty in tmindstat.error;time.epochfloat