J/A+A/562/A107ivo://CDS.VizieR/J/A+A/562/A107doi:10.26093/cds/vizier.35620107CDSKajatkari P.Hackman T.Jetsu L.Lehtinen J.Henry G.W.2017-06-30T05:48:11Z2014-02-13T12:41:52ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe model the photometry of RS CVn star sigma Geminorum to obtain new information on the changes of the surface starspot distribution, that is, activity cycles, differential rotation, and active longitudes. We used the previously published continuous period search (CPS) method to analyse V-band differential photometry obtained between the years 1987 and 2010 with the T3 0.4m Automated Telescope at the Fairborn Observatory. The CPS method divides data into short subsets and then models the light-curves with Fourier-models of variable orders and provides estimates of the mean magnitude, amplitude, period, and light-curve minima. These light-curve parameters are then analysed for signs of activity cycles, differential rotation and active longitudes.2014A&A...562A.107Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/562/A107CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/123/209 : Radial velocity curve of Sigma Gem (Duemmler+ 1997)J/A+A/527/A136 : HD 116956 V-band differential light curve (Lehtinen+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/562/A107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/562/A107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/562/A107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/562/A107https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/562/A107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/562/A107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/562/A107/res*Numerical results of the CPS analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSEG[1/23] Segment numbermeta.idintt01st timepoint in SEG (HJD-2400000)dtime.epochdoubleSET[1/65] Dataset numbermeta.id;meta.mainintt11st timepoint in SET (HJD-2400000)dtime.epochdoubletnLast timepoint in SET (HJD-2400000)dtime.epochdoubletauMean epoch {tau} of SET (HJD-2400000)dtime.epochdoubleIND[0/1] Independency of SET (1=independent)meta.codeintnNumber of observations in SETmeta.numberintmyMean of observations in SETmagphot.mag;obsfloate_myStandard deviation of observations in SETmagstat.errorfloatK[0/2] Light curve modelling orderstat.varianceintse[0.002/0.020] Standard deviation of residualsmagstat.stdevfloatTC[-2/191] Timescale of changedtime.epochdoubleM[-1.16/-0.98] Light curve meanmagphot.mag;stat.meanfloate_M[0.0006/0.0144] Error of Mmagstat.errorfloatq_M[0/1] Reliability of M (1=unreliable)meta.code.qualintPer[14/26]? Period of light curve in SETdtime.periodfloatnullablee_Per? Error of Perdstat.errorfloatnullableq_Per[0/1] Reliability of Per (1=unreliable)meta.code.qualintAmp[0.01/0.15]? Light curve amplitudemagsrc.var.amplitudefloatnullablee_Amp? Error of Ampmagstat.errorfloatnullableq_Amp[0/1] Reliability of Amp (1=unreliable)meta.code.qualinttmin1? Epoch of primary minimum (HJD-2400000)dtime.epochdoublenullablee_tmin1? Error of tmin1dstat.errorfloatnullableq_tmin1[0/1] Reliability of tmin1 (1=unreliable)meta.code.qualinttmin2? Epoch of secondary minimum (HJD-2400000)dtime.epochdoublenullablee_tmin2? Error of tmin2dstat.errorfloatnullableq_tmin2[0/1] Reliability of tmin2 (1=unreliable)meta.code.qualintJ/A+A/562/A107/photDifferential photometry of sigma GemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliodentric Julian Datedtime.epochdoubleDVmagDifferential V-band photometrymagphot.mag;em.opt.V;arith.difffloatSEG[1/23] Segment number (column added at CDS)meta.idint