J/A+A/645/A25ivo://CDS.VizieR/J/A+A/645/A25doi:10.26093/cds/vizier.36450025CDSBrogaard K.Pakstiene E.Grundahl F.Mikolaitis S.Tautvaisiene G.,Slumstrup D.Talens G.J.J.VandenBerg D.A.Miglio A.Arentoft T.,Kjeldsen H.Janulis R.Drazdauskas A.Marchini A.Minkeviciute R.,Stonkute E.Bagdonas V.Fredslund Andersen M.Jessen-Hansen J.,Palle P.L.Dorval P.Snellen I.A.G.Otten G.P.P.L.White T.R.2021-09-09T12:33:58Z2020-12-23T10:21:08ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsccd-photometryvisible-astronomyThe derivation of accurate and precise masses and radii is possible for eclipsing binary stars, allowing for insights into their evolution. When residing in star clusters, they provide measurements of even greater precision, along with additional information on their properties. Asteroseismic investigations of solar-like oscillations offers similar possibilities for single stars. We wish to improve the previously established properties of the Hyades eclipsing binary HD 27130 and re-assess the asteroseismic properties of the giant star {epsilon} Tau. The physical properties of these members of the Hyades can be used to constrain the helium content and age of the cluster. New multi-colour light curves were combined with multi-epoch radial velocities to yield masses and radii of HD 27130. Measurements of Teff were derived from spectroscopy and photometry, and verified using the Gaia parallax. We estimated the cluster age from re-evaluated asteroseismic properties of {epsilon} Tau while using HD 27130 to constrain the helium content. The masses, radii, and Teff of HD 27130 were found to be M=1.0245+/-0.0024M_{sun}_, R=0.9226+/-0.015R_{sun}_, Teff=5650+/-50K for the primary, and M=0.7426+/-0.0016M_{sun}_, R=0.7388+/-0.026R_{sun}_, Teff=4300+/-100K for the secondary component. Our re-evaluation of {epsilon} Tau suggests that the previous literature estimates are trustworthy and that the HIPPARCOS parallax is more reliable than the Gaia DR2 parallax. The helium content of HD 27130 and, thus, of the Hyades is found to be Y=0.27 but with a significant model dependency. Correlations with the adopted metallicity result in a robust helium enrichment law, with {DELTA}Y/{DELTA}Z close to 1.2 We estimate the age of the Hyades to be 0.9+/-0.1(stat)+/-0.1(sys)Gyr, which is in slight tension with recent age estimates based on the cluster white dwarfs. The precision of the age estimate can be much improved via asteroseismic investigations of the other Hyades giants and by future improvements to the Gaia parallax for bright stars.2021A&A...645A..25Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/645/A25CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/645/A25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/645/A25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/645/A25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/645/A25https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/645/A25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/645/A25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/645/A25/table9LC of HD 27130 in Johnson B-band from MAOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Bandmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[BVI ] Band for magnitudeinstr.bandpasscharInst[MAO AO SU] Instrument (MAO or AO SU)meta.id;instrcharJ/A+A/645/A25/table8MASCARA LC of HD 27130recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoubleLSTLocal sidereal time of the observationtime.epochdoublemagMagnitude after primary calibrationmagphot.magdoublee_magUncertainty on magmagstat.error;phot.magdoubleLegendreModel of trends from secondary calibration, this should be subtracted from MAG to obtain the lightcurve shown in the papermagphot.mag;arith.diffdoublePhasePhase of the binarytime.phasedoubleModelRunning mean in PHASE obtained as part of disentangling the secondary calibration and binary signal (as described in the paper)magphot.mag;stat.meandoubleJ/A+A/645/A25/table10LC of HD 27130 in Johnson V-band from MAOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Bandmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[BVI ] Band for magnitudeinstr.bandpasscharInst[MAO AO SU] Instrument (MAO or AO SU)meta.id;instrcharJ/A+A/645/A25/table11LC of HD 27130 in Cousins I-band from MAOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Bandmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[BVI ] Band for magnitudeinstr.bandpasscharInst[MAO AO SU] Instrument (MAO or AO SU)meta.id;instrcharJ/A+A/645/A25/table12LC of HD 27130 in Johnson V-band from AO SUrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Bandmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[BVI ] Band for magnitudeinstr.bandpasscharInst[MAO AO SU] Instrument (MAO or AO SU)meta.id;instrcharJ/A+A/645/A25/table13LC of HD 27130 in Cousins I-band from AO SUrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Bandmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[BVI ] Band for magnitudeinstr.bandpasscharInst[MAO AO SU] Instrument (MAO or AO SU)meta.id;instrcharJ/A+A/645/A25/table14Corrected LC of HD 27130 in Johnson V-bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Band, corrected, normalisedmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[VI MASCARA ] Band for magnitudeinstr.bandpasscharJ/A+A/645/A25/table15Corrected LC of HD 27130 in Cousins I-bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Band, corrected, normalisedmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[VI MASCARA ] Band for magnitudeinstr.bandpasscharJ/A+A/645/A25/table16Corrected MASCARA LC of HD 27130recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (TDB), BJD-2400000dtime.epochdoublemagPhotomeric magnitude in Band, corrected, normalisedmagphot.magdoublee_magUncertainty on photometric magnitudemagstat.error;phot.magfloatBand[VI MASCARA ] Band for magnitudeinstr.bandpasschar