J/A+A/400/659ivo://CDS.VizieR/J/A+A/400/659doi:10.26093/cds/vizier.34000659CDSCutispoto G.Messina S.Rodono M.2003-04-12T19:14:05Z2003-04-12T19:13:27ZCDS 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-flaresAs part of an extensive program focused on the global properties and evolution of active stars, high-precision UBV(RI)c and UBV photometry of 18 selected stars is presented. UBV(RI)c observations were collected at the European Southern Observatory over the intervals 21-28 September 1994 and 25 November - 05 December 1994. Additional UBV photometry obtained late in 1994 by Catania Astrophysical Observatory Automatic Photoelectric Telescope is also presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Some spectral classifications are revised and photometric parallaxes are compared, whenever possible, with the values measured by the Hipparcos satellite. These observations are finalized to the construction of an extended photometric database, which can give important clues on topics such as the stability of spotted areas, differential stellar rotation, solar-like activity cycles and the correlation between inhomogeneities at different atmospheric levels.2003A&A...400..659Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/400/659CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/119/281 : Long-term monitoring of active stars. V. (Cutispoto, 1996)J/A+AS/121/369 : Long-term monitoring of active stars. VI. (Cutispoto, 1997)J/A+AS/127/207 : Long-term monitoring of active stars. VII. (Cutispoto 1998)J/A+AS/131/321 : Long-term monitoring of active stars. VIII. (Cutispoto 1998)J/A+A/367/910 : Long-term monitoring of active stars. IX. (Cutispoto+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/400/659https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/400/659http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/400/659https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/400/659https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/400/659http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/400/659GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/400/659/position (Star positions from Simbad)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/400/659/position?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/400/659/position?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/400/659/position?GETtext/xml+votable180.050000true5.715833-12.2094440.0055555555555555566/682 686 17058 17218-17219 17223 17753-17754 18007 19796 20618 20902 20922 21269 21375 21501-21502 22146 22158 22187 22801 22805 22813 22884 33034-33035 33099 33116 33519 34265 34268 34892 35145 35148 35150 35767 35773 35819 36234 36238 36261 36808 36836 36848 47095 48263 48274https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/400/659?format=asciiOpticalInfrareddefaultJ/A+A/400/659/table4V-band magnitude and colors obtained for the comparison (c) and check (ck) stars obtained at ESOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarComparison or check star namemeta.id;meta.maincharVmagV magnitudemagphot.mag;em.opt.VfloatU-BU-B colour index (1)magphot.color;em.opt.U;em.opt.Bfloatu_U-BUncertainty flag on U-B (1)meta.code.errorcharB-VB-V colour index (1)magphot.color;em.opt.B;em.opt.VfloatV-RCousins V-R colour index (1)magphot.color;em.opt.V;em.opt.RfloatV-ICousins V-I colour index (1)magphot.color;em.opt.V;em.opt.IfloatJ/A+A/400/659/ubvriUBV(RI)c data obtained at La Silla observatoryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharHJDHeliocentric Julian Daydtime.epochdoublePhase[0/1] Phase (2)time.phasefloatVmagV-band 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.VfloatnullableV-R? V-Rc colour index (1)magphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-Ic colour index (1)magphot.color;em.opt.V;em.opt.IfloatnullableJ/A+A/400/659/positionStar positions from SimbadrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar names (program, comparison and check)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSimbadask the SIMBAD data-base about this objectmeta.refcharJ/A+A/400/659/table1Summary of photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star name (v)meta.id;meta.maincharONameOther name of program starmeta.idcharEpochMean epoch of observationsyrtime.epochfloatCompComparison star (c)meta.idcharCheckCheck star (ck)meta.idcharv-cStandard deviation for the v-c V-band differential magnitudemagstat.stdevfloatck-cStandard deviation for the ck-c V-band differential magnitudemagstat.stdevfloatNightsNumber of nightsmeta.numberintDeltaVPeak-to-peak amplitude of the V-band light curvemagsrc.var.amplitudefloatPer? Period of variabilitydtime.perioddoublenullableJ/A+A/400/659/table3Summary of stellar datau_DHUncertainty flag on DHmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star namemeta.id;meta.maincharEpochMean epoch of observationsyrtime.epochfloatVmagV-band maximum luminositymagphot.mag;em.opt.VfloatU-BU-B colour index at maximum luminositymagphot.color;em.opt.U;em.opt.BfloatB-VB-V colour index at maximum luminositymagphot.color;em.opt.B;em.opt.VfloatV-RCousins V-R colour index at maximum luminositymagphot.color;em.opt.V;em.opt.RfloatV-ICousins V-I colour index at maximum luminositymagphot.color;em.opt.V;em.opt.IfloatPer? Period of variabilitydtime.perioddoublenullableSpTypeInferred Spectral typesrc.spTypecharl_DHLimit flag on DHmeta.code.errorcharDH? Distance measured by the Hipparcos satellitepcpos.distancefloatnullabledphPhotometric distance inferred from the spectral classificationpcpos.distancefloatu_dphUncertainty flag on dphmeta.code.errorcharVmaxV-band maximum luminosity ever observedmagphot.mag;em.opt.Vfloat