J/MNRAS/488/3274ivo://CDS.VizieR/J/MNRAS/488/3274doi:10.26093/cds/vizier.74883274CDSde Freitas D.B.Nepomuceno M.M.F.Cordeiro J.G.Das Chagas M.L.,De Medeiros J.R.2024-08-20T20:12:13Z2023-02-03T15:09:21ZCDS support team

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

cds-question@unistra.frg-starseffective-temperaturestellar-massesvisible-astronomyA multifractal formalism is employed to analyse high-precision time-series data of Kepler stars with surface differential rotation (DR) traces. The multifractal detrended moving average (MFDMA) algorithm has been explored to characterize the multiscale behaviour of the observed time series from a sample of 662 stars selected with parameters close to those of the Sun (e.g. effective temperature, mass, effective gravity and rotation period). Among these stars, 141 have surface DR traces, whereas 521 have no detected DR signatures. In our sample, we also include the Sun in its active phase. Our results can be summarized in two points. First, our work suggests that star-spots for time series with and without DR have distinct dynamics. Secondly, the magnetic fields of active stars are apparently governed by two mechanisms with different levels of complexity for fluctuations. Throughout the course of the study, we identified an overall trend whereby the DR is distributed in two H regimes segregated by the degree of asymmetry A, where H-index denotes the global Hurst exponent that is used as a measure of long-term memory of time series. As a result, we show that the degree of asymmetry can be considered a segregation factor that distinguishes the DR behaviour when related to the effect of the rotational modulation on the time series. In summary, the multifractality signals in our sample are the result of magnetic activity control mechanisms leading to activity-related long-term persistent signatures.2019MNRAS.488.3274Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/3274CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/560/A4 : Rotation periods of active Kepler stars (Reinhold+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/3274https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/3274http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/3274https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/3274https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/3274http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/3274GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/3274/table1 (Results of the geometric analysis of the multifractal spectrum for the indices A, {Delta}{alpha}, {Delta}f_L_({alpha}), {Delta}f_R_({alpha}) and H for the Sun and 141 stars with DR, using the SAP4 flux)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/3274/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/3274/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/3274/table1?GETtext/xml+votable180.050000true5/3743 3778 6/14567 14578-14580 14583 14585-14586 14590-14591 14753 14760 14762-14764 14774 14778 14781-14783 14825-14827 14915 14917 14919-14920 14923-14924 14928 14930-14933 14938-14939 14941-14942 14948 14954 14957-14961 14963-14964 14966-14968 14971 15040-15041 15044 15060 15104 15106-15107 15109-15110 15116 15118-15121 15126 15130 15132-15134 15138-15139 15141 15143-15146 15149 15154 15156-15158 15160 15168-15170 15172https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/3274?format=asciiOpticaldefaultJ/MNRAS/488/3274/table1Results of the geometric analysis of the multifractal spectrum for the indices A, {Delta}{alpha}, {Delta}f_L_({alpha}), {Delta}f_R_({alpha}) and H for the Sun and 141 stars with DR, using the SAP4 fluxSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICStar name (Sun and NNNNNNNN from KIC)meta.id;meta.maincharP1Primary rotation perioddtime.periodfloatP2Secondary rotation perioddtime.periodfloatTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatMassStar masssolMassphys.massfloatProtRotation perioddtime.periodfloatADegree of asymmetry (1)stat.fit.paramfloatDalphaDegree of multifractality (2)stat.fit.paramfloatDfLSingularity parameter {Delta}f_L_ (3)stat.fit.paramfloatDfRSingularity parameter {Delta}f_R_ (3)stat.fit.paramfloatHHurst exponent (4)stat.fit.paramfloatbetaRelative shear (5)stat.fit.paramfloatDOmegaHorizontal absolute shear (6)rad/dstat.fit.paramfloat_RAPositions from KIC (Cat. V/133) catalog (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions from KIC (Cat. V/133) catalog (declination part)degpos.eq.dec;meta.mainnullable