J/A+AS/127/207ivo://CDS.VizieR/J/A+AS/127/207CDSCutispoto G.1998-03-05T21:06:48Z1998-03-05T22:06:44ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyWide-band photometrykron-cousins-photometrystellar-flaresIn the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)c photometry of 19 selected stars, collected at ESO over the 15-31 March 1991 interval is presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Most of the spectral classification are discussed. A flare event was detected for the star HD 127535 = V841 Cen. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels.1998A&AS..127..207Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/127/207CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/119/281 : UBV(RI)c photometry of active stars. V. (Cutispoto, 1996)J/A+AS/121/369 : UBVRI observations of active stars. VI. (Cutispoto, 1997)J/A+AS/131/321 : UBV(RI)c photometry of active stars. VIII. (Cutispoto 1998)J/A+A/367/910 : UBV(RI)c photometry of active stars. IX. (Cutispoto+, 2001)J/A+A/400/659 : UBV(RI)c photometry of active stars. X. (Cutispoto+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/127/207https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/127/207http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/127/207https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/127/207https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/127/207http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/127/207GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+AS/127/207/table1Comparison (c) and check (ck) stars for each program star (v)NNumber of nightsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD name of program starmeta.id;meta.maincharNameOther name of program starmeta.idcharcHDHD name of comparison starmeta.idcharckNameName of check starmeta.id.assoccharsig(v-c)Standard deviation for the (v-c) V-band differential magnitude for each series of nightsmagstat.errorfloatsig(ck-c)Standard deviation for the (ck-c) V-band differential magnitude for each series of nightsmagstat.errorfloatJ/A+AS/127/207/table3V magnitude and colors for the c and ck stars derived from standards stars.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameComparison or check star namemeta.id;meta.maincharVmagV magnitudemagphot.mag;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatu_U-B[:] Note on error (1)meta.code.errorcharB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatu_B-V[:] Note on error (1)meta.code.errorcharV-RcV-Rc colour indexmagphot.color;em.opt.V;em.opt.RfloatR-IcR-Ic colour indexmagphot.color;em.opt.R;em.opt.IfloatJ/A+AS/127/207/table4Maximun luminosity (Vmax) and corresponding colors for the program stars and inferred spectral classificationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD name of program starmeta.id;meta.maincharm_HDMultiplicity index on HDmeta.code.multipcharNameOther name of program starmeta.idcharVmaxMaximun luminositymagphot.mag;em.opt.VfloatU-B? U-B colour index corresponding to Vmaxmagphot.color;em.opt.U;em.opt.BfloatnullableB-VB-V colour index corresponding to Vmaxmagphot.color;em.opt.B;em.opt.VfloatV-RcV-Rc colour index corresponding to Vmaxmagphot.color;em.opt.V;em.opt.RfloatV-IcV-Ic colour index corresponding to Vmaxmagphot.color;em.opt.V;em.opt.IfloatSpTypeInferred spectral classificationsrc.spTypecharJ/A+AS/127/207/appenUBV(RI)c data of the 19 active stars observedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharHJDHeliocentric Julian daydtime.epochdoublePhase? [0/1[ Corresponding phasetime.phasefloatnullableVmagV magnitudemagphot.mag;em.opt.VfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullable(V-R)c(V-R)c colour indexmagphot.color;em.opt.V;em.opt.Rfloat(V-I)c(V-I)c colour indexmagphot.color;em.opt.V;em.opt.Ifloat