J/ApJS/237/17ivo://CDS.VizieR/J/ApJS/237/17doi:10.26093/cds/vizier.22370017CDSSantos A.R.G.Campante T.L.Chaplin W.J.Cunha M.S.Lund M.N.,Kiefer R.Salabert D.Garcia R.A.Davies G.R.Elsworth Y.Howe R.2019-01-07T08:53:56Z2018-10-22T14:48:08ZCDS support team

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

cds-question@unistra.frasteroseismologyg-starsIn the Sun, the frequencies of the acoustic modes are observed to vary in phase with the magnetic activity level. These frequency variations are expected to be common in solar-type stars and contain information about the activity-related changes that take place in their interiors. The unprecedented duration of Kepler photometric time-series provides a unique opportunity to detect and characterize stellar magnetic cycles through asteroseismology. In this work, we analyze a sample of 87 solar-type stars, measuring their temporal frequency shifts over segments of 90 days. For each segment, the individual frequencies are obtained through a Bayesian peak-bagging tool. The mean frequency shifts are then computed and compared with: (1) those obtained from a cross-correlation method; (2) the variation in the mode heights; (3) a photometric activity proxy; and (4) the characteristic timescale of the granulation. For each star and 90-day sub-series, we provide mean frequency shifts, mode heights, and characteristic timescales of the granulation. Interestingly, more than 60% of the stars show evidence for (quasi-)periodic variations in the frequency shifts. In the majority of the cases, these variations are accompanied by variations in other activity proxies. About 20% of the stars show mode frequencies and heights varying approximately in phase, in opposition to what is observed for the Sun.2018ApJS..237...17Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/237/17CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)J/ApJS/199/30 : Temperature scale for KIC stars (Pinsonneault+, 2012)J/ApJ/767/127 : Asteroseismic solutions for 77 Kepler stars (Huber+, 2013)J/ApJ/775/L11 : Stellar rotation periods for KOIs (McQuillan+, 2013)J/ApJ/763/L26 : SMARTS observations of eps Eridani (Metcalfe+, 2013)J/MNRAS/436/1883 : Properties of KOI host stars (Walkowicz+, 2013)J/ApJ/787/110 : SAGA: Stromgren survey of seismic KIC (Casagrande+, 2014)J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)J/ApJ/789/154 : Kepler-10 RV measurements by HARPS-N (Dumusque+, 2014)J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)J/MNRAS/446/2959 : Asterosismology for solar analogues (Davies+, 2015)J/ApJ/812/12 : S-index and Stroemgren LC of HD30495 (Egeland+, 2015)J/A+A/578/A137 : Solar acoustic modes in period 1996-2014 (Salabert+, 2015)J/MNRAS/452/2127 : Fundamental param. of Kepler stars (Silva Aguirre+, 2015)J/ApJ/835/172 : Kepler asteroseismic LEGACY. I. Oscillations (Lund+, 2017)J/ApJ/835/173 : Kepler asteroseismic LEGACY. II. (Silva Aguirre+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/237/17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/237/17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/237/17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/237/17https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/237/17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/237/17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/237/17/table1 (Stellar parameters of the target composed of 87 Kepler solar-type stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/237/17/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/237/17/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/237/17/table1?GETtext/xml+votable180.050000true292.082695837.05983190.0055555555555555565/3734 3740 6/14578 14581 14585 14751 14757 14759 14763 14765 14767 14770 14771 14776 14778 14779 14780 14781 14782 14819 14918 14921 14924 14930 14931 14932 14933 14935 14948 14959 14966 14967 14968 14969 14970 15044 15057 15061 15062 15106 15107 15109 15112 15118 15120 15121 15123 15129 15131 15134 15145 15146 15149 15155 15156 15168 15171 15172 15173 15174 15178https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/237/17?format=asciidefaultJ/ApJS/237/17/table1Stellar parameters of the target composed of 87 Kepler solar-type starsQQuarters (1)time.intervalcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNmNumber of peak-bagging measurements for this star (link to table 2)meta.numberintnullableKIC[1435467/12317678] Kepler Input Cat. identifiermeta.id;meta.mainintprimaryKOI[2/3158]? KOI star numbermeta.idintnullableKpmag[5.8/12.3] Kepler magnitudemagphot.mag;em.optfloatnumax[884.7/4660] Frequency of the maximum power (2)uHzem.freq;src.varfloate_numax[2.7/280] Negative uncertainty on numaxuHzstat.errorfloatE_numax[2.8/280] Positive uncertainty on numaxuHzstat.error;stat.maxfloatDelnu[48.4/179.7] Large frequency separation (2)uHzem.freq;src.varfloate_Delnu[0.01/2.5] Negative uncertainty on DelnuuHzstat.errorfloatE_Delnu[0.01/2.5] Positive uncertainty on DelnuuHzstat.error;stat.maxfloatTeff[5046/6642] Effective temperatureKphys.temperature.effectiveinte_Teff[50/180] Negative uncertainty on TeffKstat.error;phys.temperature.effectiveintE_Teff[1/8] Positive uncertainty on TeffKstat.error;stat.maxint[Fe/H][-1/0.4] Metallicitylog(Sun)phys.abund.Zfloate_[Fe/H][0.02/0.2] [Fe/H] uncertaintylog(Sun)stat.error;phys.abund.Fefloatr_[Fe/H][1/8] Reference for [Fe/H] and Teff (3)meta.refintlogg[3.9/4.6] Log of gravity surface from Silva Aguirre+ (2015, J/MNRAS/452/2127 and 2017, J/ApJ/835/173)log(cm.s**-2)phys.gravityfloate_logg[0.002/0.02] Negative uncertainty on logglog(cm.s**-2)stat.errorfloatE_logg[0.002/0.02] Positive uncertainty on logglog(cm.s**-2)stat.error;stat.maxfloatProt[0.9/35.4]? Rotational perioddtime.periodfloatnullablee_Prot[0.001/6]? Prot uncertaintydstat.errorfloatnullabler_Prot[9/16]? Reference for Prot (3)meta.ref;pos.frameintnullableLEGACYDisplay the LEGACY data (Lund+, 2017, J/ApJ/835/172 and Silva Aguirre+, 2017, J/ApJ/835/173) and BASTA data (Silva Aguirre+, 2015, J/MNRAS/452/2127) for this starmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_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/ApJS/237/17/table2Peak-bagging for the Kepler stars in the sampleOrder1[15/24] First central ordermeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC[1435467/12317678] Kepler Input Cat. number (1)meta.id;meta.mainintOrder2[19/28] Fifth central ordermeta.numberintf_shiftsCC[*] Flag on shiftsCC (2)meta.codecharTime[45/1450] Time of the sub-series midpointdtime.epochintDC[0.01/1]? Duty cycle of the sub-seriesmeta.number;time.periodfloatnullabletaug[133/667]? Characteristic granulation timescalestime.scalefloatnullablee_taug[0/812]? Uncertainty in taugsstat.errorfloatnullableshift0[-2.2/2.1]? Mean frequency shifts for l=0 (3)uHzem.freq;stat.meanfloatnullablee_shift0[0.05/1.1]? Uncertainty in shift0uHzstat.errorfloatnullableshift1[-1.3/1.6]? Mean frequency shifts for l=1 (3)uHzem.freq;stat.meanfloatnullablee_shift1[-1.3/1.1]? Uncertainty in shift1uHzstat.errorfloatnullableshift2[-1.9/1.8]? Mean frequency shifts for l=2 (3)uHzem.freq;stat.meanfloatnullablee_shift2[0.05/2]? Uncertainty in shift2uHzstat.errorfloatnullable<shift>[-1.4/1.6]? Mean frequency shifts, combining l=0 and l=1 (3)uHzem.freq;stat.meanfloatnullablee_<shift>[0.04/0.7]? Uncertainty in <shift>uHzstat.error;phys.atmol.lineShiftfloatnullablelogS[-1/3.7]? Mean logarithmic mode heights (3)src.var.amplitudefloatnullablee_logS[0.08/1.2]? Uncertainty in logSstat.errorfloatnullableshiftsCC[-0.9/1.6]? Frequency shifts obtained with CC method (4)uHzem.freqfloatnullablee_shiftsCC[0.06/16.6]? Uncertainty in shiftsCCuHzstat.errorfloatnullableJD? Julian date of the observation (updated column)dtime.epochdoublenullable