J/A+A/710/A143ivo://CDS.VizieR/J/A+A/710/A143CDSChoi J.Y.Espinoza-Rojas F.Hekker S.2026-06-10T07:48:16Z2026-06-10T08:36:31ZCDS support team

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

cds-question@unistra.frgiant-starsasteroseismologyphotometryvisible-astronomyLight curves of oscillating stars provide valuable insights into the stellar interiors. In some cases, the aperture mask used to extract a light curve can record fluxes from multiple stars. When oscillations from a pair of stars are captured within a single aperture, they can be considered as potential asteroseismic binaries (ABs). If the two stars oscillate at similar frequency ranges, the superpositioned oscillation patterns appear as if from a single star, which can lead to the derivation of inaccurate asteroseismic parameters. In this study, we investigate seismically unresolved AB candidates consisting of two red-giant stars observed by Kepler. We aim to make a direct comparison between the power density spectra (PDSs) of blended and separated oscillations from both stars in each candidate, and examine how oscillations from two stars in a PDS impact the measurement of asteroseismic and stellar parameters. We selected stars from the APOKASC3 catalog that have at least one neighboring source within 20 arcsec and show oscillations in similar frequency ranges. We focus on the systems where the light curves from each star in AB candidates are available or can be extracted with a custom mask. From these star pairs, we identified 6 seismically unresolved AB candidates whose PDS morphologies change noticeably across light curves extracted with different apertures. We determined asteroseismic parameters and derived masses and radii from the PDSs of both AB candidates and single stars to quantify the biases. Oscillations from two stars in a single PDS cause inaccurate mode identification and bias the seismic parameters. These biases propagate into stellar properties, with mass and radii for the 6 AB candidates investigated here differing by up to ~3 and ~2 times relative to the individual stars, respectively. For the AB candidate with the most complex PDS, core properties such as period spacings and coupling factors become unreliable, with the coupling factor often being overestimated. We checked that all 6 AB candidates are chance alignments. Our results indicate that the inconsistencies in asteroseismic and stellar parameters across various studies on the stars with complex PDSs can be explained by potential seismically unresolved asteroseismic binaries. These findings highlight the importance of identifying and accurately accounting for such systems in asteroseismic analysis.2026A&A...710A.143Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A143CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)I/355 : Gaia DR3 Part 1: Main sourcesJ/ApJS/276/69 : APOKASC-3: evolved KIC stars (Pinsonneault+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A143https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/A143/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A143/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A143/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A143/stars?GETtext/xml+votable180.050000true292.80687537.76419440.0055555555555555566/14575 14579 14590 14924 14938https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A143?format=asciiOpticaldefaultJ/A+A/710/A143/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainFileName1Name of the table with peakbagging results from TACOmeta.id;meta.datasetcharLCShow the light curvesmeta.ref.urlcharFileName2Name of the table with light curvemeta.id;meta.datasetcharJ/A+A/710/A143/2449558pKIC 2449558 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/2449570pKIC 2449570 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/2570370pKIC 2570370 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/2570384pKIC 2570384 peakbagging results from TACOe_Amp? Uncertainty on Ampstat.errordoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/3122185pKIC 3122185 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/3122188pKIC 3122188 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/4042300pKIC 4042300 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/4042308pKIC 4042308 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/5098143pKIC 5098143 peakbagging results from TACOLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoublee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/5098145pKIC 5098145 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/6430834pKIC 6430834 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/6430841pKIC 6430841 peakbagging results from TACOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqOscillation mode peak frequencyuHzem.freq;stat.maxdoubleAmpOscillation mode peak amplitude in ppmsrc.var.amplitude;stat.maxdoubleLW? Oscillation mode peak linewidth (1)uHzinstr.setup;stat.maxdoublenullablee_Freq? Uncertainty on Freq (2)uHzstat.errordoublenullablee_Amp? Uncertainty on Ampstat.errordoublenullablee_LW? Uncertainty on LWuHzstat.errordoublenullableHeightOscillation mode peak height in ppm^2^/muHz1e-06Hz**-1pos.cartesian.z;stat.maxdoubleAICAIC difference (3)stat.fit.paramdoublel? Spherical degree of the mode (4)stat.fit.paramintnullableJ/A+A/710/A143/2570384tKIC 2570384 light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (truncated barycentric Julian date, BJD-2400000)dtime.epochdoubleindexedFluxRelative flux (ppm)phot.flux;arith.ratiodoublee_FluxFlux error (ppm)stat.error;phot.fluxdoubleJ/A+A/710/A143/3122188tKIC 3122188 light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (truncated barycentric Julian date, BJD-2400000)dtime.epochdoubleindexedFluxRelative flux (ppm)phot.flux;arith.ratiodoublee_FluxFlux error (ppm)stat.error;phot.fluxdoubleJ/A+A/710/A143/6430834tKIC 6430834 light curveFluxRelative flux (ppm)phot.flux;arith.ratiodoublee_FluxFlux error (ppm)stat.error;phot.fluxdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (truncated barycentric Julian date, BJD-2400000)dtime.epochdoubleindexedJ/A+A/710/A143/6430841tKIC 6430841 light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (truncated barycentric Julian date, BJD-2400000)dtime.epochdoubleindexedFluxRelative flux (ppm)phot.flux;arith.ratiodoublee_FluxFlux error (ppm)stat.error;phot.fluxdouble