J/A+AS/131/321ivo://CDS.VizieR/J/A+AS/131/321CDSCutispoto G.1998-08-05T22:33:26Z1998-08-05T22:32:56ZCDS 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 a part of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)c photometry of 31 selected stars, collected at the European Southern Observatory over the 14-29 February 1992 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. Some spectral classifications are revised and the inferred photometric parallaxes are compared, whenever possible, with the values measured by the Hipparcos satellite. Flare events were detected for the star HD 16157=CC Eri, EXO 055609-3804.4=TY Col and HD 119285=V851 Cen. Optical variability was discovered for the Pop II binary HD 89499. 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..131..321Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/131/321CatalogResearchIsServedByTAP VizieR generic 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+A/400/659 : Long-term monitoring 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/131/321https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/131/321http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/131/321https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/131/321https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/131/321http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/131/321GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+AS/131/321/table3V magnitude and colors for the c and ck stars derived from standard stars.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameComparison or check star namemeta.id;meta.maincharprimaryVmagV magnitudemagphot.mag;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatu_U-BUncertainty flag on U-B (1)meta.code.errorcharB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-RcV-Rc colour indexmagphot.color;em.opt.V;em.opt.RfloatV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.IfloatJ/A+AS/131/321/table4Maximum luminosity and corresponding colors measured for the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram starmeta.id;meta.maincharNameOther namemeta.idcharprimaryVmagV magnitudemagphot.mag;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.BfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-RcV-Rc colour indexmagphot.color;em.opt.V;em.opt.RfloatV-IcV-Ic colour indexmagphot.color;em.opt.V;em.opt.IfloatSpTypeSpectral Typesrc.spTypecharl_DistH[>= ] Limit flag on DistHmeta.code.errorcharDistH? Distance range measured by the Hipparcos satellitekpcpos.distancefloatnullablen_DistH[-] Dash when intervalmeta.notecharDistH2? Upper limit when intervalkpcpos.distancefloatnullablel_Distph[>= ] Limit flag on Distphmeta.code.errorcharDistphPhotometric distance inferred from the adopted spectral classificationkpcpos.distancefloatn_Distph[-] Dash when intervalmeta.notecharDistph2? Upper limit when intervalkpcpos.distanceintnullableVmaxV-band maximum luminosity ever observedmagphot.mag;em.opt.VfloatJ/A+AS/131/321/table1Comparison (c) and check (ck) stars for each program starNNumber of nightsmeta.numberintStarProgram starmeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOther name of the program starmeta.idcharprimaryCompComparison star name (c)meta.idcharCheckCheck star name (ck)meta.idchare(v-c)Standard deviation for the v-c V-band differential magnitude for each series of N nightsmagphot.mag;arith.difffloate(ck-c)Standard deviation for the ck-c V-band differential magnitude for each series of N nightsmagstat.errorfloatDeltaVAmplitude of the V-band light curvemagsrc.var.amplitudefloatPer? Period of variabilitydtime.perioddoublenullableJ/A+AS/131/321/ubvriUBV(RI)c datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryNote[fm] f: flare, m: Manfroid et al. 1995, Cat. <II/200>meta.notecharHJDHeliocentric Julian datedtime.epochdoublePhase? [0/1[ Phase (1)time.phasedoublenullableVmagV 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-R colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullable