J/ApJ/781/124ivo://CDS.VizieR/J/ApJ/781/124doi:10.26093/cds/vizier.17810124CDSCranmer S.R.Bastien F.A.Stassun K.G.Saar S.H.2017-07-10T06:38:18Z2016-01-22T15:05:01ZCDS support team

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

cds-question@unistra.frmultiple-starsstellar-masseseffective-temperatureA large fraction of cool, low-mass stars exhibit brightness fluctuations that arise from a combination of convective granulation, acoustic oscillations, magnetic activity, and stellar rotation. Much of the short-timescale variability takes the form of stochastic noise, whose presence may limit the progress of extrasolar planet detection and characterization. In order to lay the groundwork for extracting useful information from these quasi-random signals, we focus on the origin of the granulation-driven component of the variability. We apply existing theoretical scaling relations to predict the star-integrated variability amplitudes for 508 stars with photometric light curves measured by the Kepler mission. We also derive an empirical correction factor that aims to account for the suppression of convection in F-dwarf stars with magnetic activity and shallow convection zones. So that we can make predictions of specific observational quantities, we performed Monte Carlo simulations of granulation light curves using a Lorentzian power spectrum. These simulations allowed us to reproduce the so-called flicker floor (i.e., a lower bound in the relationship between the full light-curve range and power in short-timescale fluctuations) that was found in the Kepler data. The Monte Carlo model also enabled us to convert the modeled fluctuation variance into a flicker amplitude directly comparable with observations. When the magnetic suppression factor described above is applied, the model reproduces the observed correlation between stellar surface gravity and flicker amplitude. Observationally validated models like these provide new and complementary evidence for a possible impact of magnetic activity on the properties of near-surface convection.2014ApJ...781..124Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/781/124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)J/ApJS/199/30 : Effective temperature scale for KIC stars (Pinsonneault+, 2012)http://www.cfa.harvard.edu/~scranmer/ : First author's Web sitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/781/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/781/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/781/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/781/124https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/781/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/781/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/781/124/stars (Data of the paper's granulation model for 508 Kepler stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/781/124/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/781/124/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/781/124/stars?GETtext/xml+votable180.050000true292.4165337.275181110.0055555555555555565/3645 3646 3647 3690 3691 3692 3693 3695 3706 3731 3732 3733 3735 3740 3741 3743 3777 3779 3780 3782 3783 3785 3786 3788 6/14573 14575 14577 14578 14579 14730 14731 14733 14734 14735 14744 14746 14751 14752 14753 14754 14756 14757 14759 14776 14778 14779 14792 14794 14816 14818 14819 14828 14830 14917 14918 14921 14923 14936 14937 14938 14954 14955 14956 14957 14958 14968 14969 14971 15040 15041 15043 15044 15057 15059 15060 15061 15062 15104 15105 15107 15113 15114 15115 15124 15126 15136 15137 15138 15148 15149 15156 15157 15158 15160 15168 15169 15170 15172 15173 15174 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/781/124?format=asciidefaultJ/ApJ/781/124/starsData of the paper's granulation model for 508 Kepler starsMa[0.16/0.37] Dimensionless turbulent Mach number Ma (6)phys.veloc;arith.ratiodoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC[1725815/12735580] KIC number of star (1)meta.id;meta.mainintTeff[4544/6648] Effective temperature (2)Kphys.temperature.effectiveintlogg[2.6/4.6] Log of stellar surface gravity (in cgs units) (2)log(cm.s**-2)phys.gravityfloatMass[0.6/2.5] Mass of star (3)solMassphys.massfloatr_Mass[0/2] Integer flag describing source of mass (O, 1, or 2) (4)meta.refinttau[300/14000] Granulation timescale {tau}_eff_ (5)stime.scaledoublesigma[0.01/0.32] Modeled root-mean-square granulation intensity amplitude {sigma} (in ppt=parts per thousand) (7)em.freq;src.vardoubleF8m[0.01/0.24] Modeled light-curve flicker amplitude F_8_ (ppt) (8)src.var.indexdoubleF8o[0.01/0.33] Observed light-curve flicker amplitude F_8_ (ppt), from Bastien et al (2013Natur.500..427B) (8)src.var.indexfloatRvar[0.04/2.4] Observed light-curve range R_var_ (ppt) (9)src.var.indexfloatZc[7/263] Observed number of zero crossings Z_C_, from Bastien et al. (2013Natur.500..427B) (10)meta.numberintP12Display the data from Pinsonneault et al. 2012 (cat. J/ApJS/199/30)meta.numberintnullableC14Display the data from Chaplin et al. 2014 (cat. J/ApJS/210/1)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from the Kepler Input Catalog (cat. V/133) (right ascension part)degpos.eq.ra;meta.main_DEPositions from the Kepler Input Catalog (cat. V/133) (declination part)degpos.eq.dec;meta.main