J/A+A/674/A106ivo://CDS.VizieR/J/A+A/674/A106doi:10.26093/cds/vizier.36740106CDSGonzalez-Cuesta L.Mathur S.Garcia R.A.Perez Hernandez F.,Delsanti V.Breton S.N.Hedges C.Jimenez A.Della Gaspera A.,El-issami M.Fox V.Godoy-Rivera D.Pitot S.Proust N.2025-05-22T20:01:13Z2023-10-03T14:29:04ZCDS support team

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

cds-question@unistra.frasteroseismologyg-starsvisible-astronomyThe NASA K2 mission that succeeded the nominal Kepler mission observed several hundred thousand stars during its operations. While most of the stars were observed in single campaigns of ~80 days, some of them were targeted for more than one campaign. We perform an asteroseismic study of a sample of eight solar-like stars observed during K2 Campaigns 6 and 17, allowing us access to up to 160 days of data. With these two observing campaigns, we determine not only the stellar parameters but also study the rotation and magnetic activity of these stars. We first extract the light curves for the two campaigns using two different pipelines, EVEREST and Lightkurve. The seismic analysis is done on the combined light curve of C6 and C17, where the gap between them was removed and the two campaigns were 'stitched' together. We determine the global seismic parameters of the solar-like oscillations using two different methods: one using the A2Z pipeline and the other the Bayesian apollinaire code. With the latter, we also perform the peak-bagging of the modes to characterize their individual frequencies. By combining the frequencies with the Gaia DR2 effective temperature and luminosity, and metallicity for five of the targets, we determine the fundamental parameters of the targets using the IACgrids based on the MESA (Modules for Experiments in Stellar Astrophysics) code. We find that four of the stars are on the main sequence, two stars are about to leave it, and two stars are more evolved (a subgiant and an early red giant). While the masses and radii of our targets probe a similar parameter space compared to the Kepler solar-like stars, with detailed modeling, we find that for a given mass our more evolved stars seem to be older than previous seismic stellar ensembles. We calculate the stellar parameters using two different grids of models, one incorporating and one excluding the treatment of diffusion, and find that the results agree generally within the uncertainties, except for the ages. The ages obtained using the models that exclude diffusion are older, with differences of greater than 10% for most stars. The seismic radii and the Gaia DR2 radii present an average difference of 4% with a dispersion of 5%. Although the agreement is relatively good, the seismic radii are slightly underestimated compared to Gaia DR2 for our stars, the disagreement being greater for the more evolved ones. Our rotation analysis provides two candidates for potential rotation periods but longer observations are required to confirm them.2023A&A...674A.106Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/674/A106CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/674/A106https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/674/A106http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/674/A106https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/674/A106https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/674/A106http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/674/A106GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/674/A106/table1 (Atmospheric and global seismic parameters for our stars with their corresponding letter references from A to H)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/674/A106/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/674/A106/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/674/A106/table1?GETtext/xml+votable180.050000true199.7067147-13.19582420.0055555555555555566/25647 25650 25663 25667 25708 25729 25808https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/674/A106?format=asciiOpticaldefaultJ/A+A/674/A106/table1Atmospheric and global seismic parameters for our stars with their corresponding letter references from A to HSimbadSimbad column added by the CDSmeta.ref.urlcharRef[A-H] Reference letter for starmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICEPIC numbermeta.id;meta.mainlongHDHD numbermeta.idintSpTypeSpectral typesrc.spTypecharKpmagKepler magnitude (1)magphot.mag;em.optfloatTeffEffective temperature from Gaia DR2 (Cat. I/345)Kphys.temperature.effectiveinte_TeffEffective temperature errorKstat.error;phys.temperature.effectiveintLumLuminosity from Gaia DR2 (Cat. I/345)solLumphys.luminosityfloate_LumLuminosity errorsolLumstat.errorfloat[M/H]? Metallicity from Ong et al. (2021ApJ...922...18O) when availablephys.abund.Zfloatnullablee_[M/H]? Metallicity errorstat.error;phys.abundfloatnullablenumaxMaximum frequencyuHzem.freq;src.varinte_numaxMaximum frequency erroruHzstat.errorintDeltanuAmplitude of variationuHzsrc.var.amplitudefloate_DeltanuAmplitude of variation erroruHzstat.errorfloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggSurface gravity errorlog(cm.s**-2)stat.errorfloatepsPhase offsetstat.fit.paramfloate_epsPhase offset errorstat.errorfloatTableName of the table with individual frequenciesmeta.id;meta.tablechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/674/A106/tablec1Individual frequencies for HD 115680 (A, EPIC 212478598)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec2Individual frequencies for HD 116832 (B, EPIC 212485100)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec3Individual frequencies for HD 114558 (C, EPIC 212487676)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec4Individual frequencies for HD 115427 (D, EPIC 212509747), not analyzed in Ong et al. (2021ApJ...922...18O)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec5Individual frequencies for HD 120746 (E, EPIC 212516207)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec6Individual frequencies for HD 117779 (F, EPIC 212617037), not analyzed in Ong et al. (2021ApJ...922...18O)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec7Individual frequencies for HD 119026 (G, EPIC 212683142)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullableJ/A+A/674/A106/tablec8Individual frequencies for HD 119038 (H, EPIC 212772187), not analyzed in Ong et al. (2021ApJ...922...18O)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[0/3] Mode degreestat.paramintnRadial orderstat.paramintnu(ln)Frequency of the mode, {nu}_l,n_em.freq;src.vardoublee_nu(ln)Frequency of the mode errorstat.errorfloatFlag[0/1] Flag (1)meta.code.errorintFO[0/1]? Fitted by Ong et al. (2021ApJ...922...18O) (2)meta.codeintnullable