J/A+A/668/A101ivo://CDS.VizieR/J/A+A/668/A101doi:10.26093/cds/vizier.36680101CDSOlah K.Seli B.Kovari Zs.Kriskovics L.Vida K.2024-11-28T20:01:15Z2022-12-12T13:22:45ZCDS support team

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

cds-question@unistra.frstellar-flaresgiant-starsphotometryvisible-astronomyAlthough late-type dwarfs and giant stars are substantially different, their flares are thought to originate in similar physical processes and differ only by a scale factor in the energy levels. We study the validity of this approach. We search for characteristics of flares on active giants, which might be statistically different from those on main-sequence stars. We used nearly 4000 flares of 61 giants and 20 stars of other types that were observed with Kepler in long-cadence mode, which is the only suitable database for this comparative study. For every flare, we derived the duration and energy and gathered stellar parameters. Correlations between the flare characteristics and various stellar parameters were investigated. Strong correlations are found between the flare duration and the surface gravity, luminosity, and radii of the stars. Scaled flare shapes appear to be similar on giants and dwarfs with a 30 min cadence. The logarithmic relation of flare energy and duration is steeper for stars with lower surface gravity. Observed flares are longer and more energetic on giants than on dwa rfs on average. The generalized linear scaling for the logarithmic relation of flare energy and duration with a universal theoretical slope of 1/3 should slightly be modified by introducing a dependence on surface gravity.2022A&A...668A.101Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/668/A101CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/668/A101https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/668/A101http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/668/A101https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/668/A101https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/668/A101http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/668/A101GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/668/A101/table1 (Stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/668/A101/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/668/A101/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/668/A101/table1?GETtext/xml+votable180.050000true291.364565837.10316720.0055555555555555565/3693 6/14559 14578-14581 14583-14585 14588-14589 14591 14730-14732 14734 14744 14746 14750-14752 14754 14756 14758-14760 14762 14765 14770 14778-14779 14781 14794 14816 14827 14915 14920-14921 14929 14933 14938-14939 14941 14945 14947 14958 14961 15057 15061 15104 15107 15110 15113 15120-15122 15126-15127 15129 15131 15135 15149 15153-15154 15168-15170https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/668/A101?format=asciiOpticaldefaultJ/A+A/668/A101/table1Stellar parametersSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler Input Catalog IDmeta.id;meta.mainintTeff? Effective temperatureKphys.temperature.effectiveintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullable[Fe/H]? Metallicityphys.abund.ZfloatnullableMass? MasssolMassphys.massfloatnullableRad? RadiussolRadphys.size.radiusfloatnullableLbol? Bolometric luminositysolLumphys.luminosityfloatnullableLumClassLuminosity class (dwarf or giant)src.class.luminositychartaumedianMedian flare durationmintime.duration;stat.medianfloatNflaresNumber of Kepler flaresmeta.numberint_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/668/A101/table2Flare parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler Input Catalog IDmeta.id;meta.maininttpeakPeak time in BJDdtime.epoch;stat.maxdoublet12Flare width time scalemintime.scalefloattauDurationmintime.durationfloatEDEquivalent durationmintime.durationfloatEKepler? Flare energy in the Kepler band1e-07Wphys.energydoublenullableTypeSimple or complex flaremeta.codechar