J/A+AS/121/369ivo://CDS.VizieR/J/A+AS/121/369CDSCutispoto G.2000-03-30T22:17:57Z2000-03-30T22:16:53ZCDS 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-photometryIn the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)_c_ photometry of 9 selected stars, collected at the European Southern Observatory over the intervals 7-17 September and 30 September - 10 October 1990, 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 of the spectral classifications are discussed. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of the spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels. For a description of the UBV and (RI)c photometric systems, see e.g. General Catalog of Photometric Data <GCPD/01> and <GCPD/54>1997A&AS..121..369Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/121/369CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/119/281 : UBV(RI)c photometry of active stars. V. (Cutispoto, 1996)J/A+AS/127/207 : UBV(RI)c photometry of active stars. VII. (Cutispoto 1998)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)Table 1: Comparison (c) and check (ck) stars used for each program starTable2: Mean atmospheric extinction coefficients for La Silla site,https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/121/369https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/121/369http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/121/369https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/121/369https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/121/369http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/121/369GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+AS/121/369/table3Maximum luminosity and corresponding colors for the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameVariable Name (v)charprimarySimbadask the SIMBAD data-base about this objectcharVmaxV-band maximum luminositymagphot.mag;em.opt.VfloatU-BU-B color index at maximum luminositymagphot.color;em.opt.U;em.opt.BfloatB-VB-V color index at maximum luminositymagphot.color;em.opt.B;em.opt.VfloatV-RcV-R_c_ color index at maximum luminositymagphot.color;em.opt.V;em.opt.RfloatV-IcV-I_c_ color index at maximum luminositymagphot.color;em.opt.V;em.opt.IfloatVv-cStandard deviation for the v-c V-band differential magnitudesmagphot.mag;arith.difffloatVck-cStandard deviation for the ck-c V-band differential magnitudesmagphot.mag;arith.difffloato_VmaxNumber of nightsmeta.numberintSpInferred spectral typesrc.spTypecharJ/A+AS/121/369/table4V magnitude and colors for the c and ck stars derived via standard starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDc or ck HD numbermeta.id;meta.maincharVmagV-band magnitudemagphot.mag;em.opt.VfloatU-BU-B color indexmagphot.color;em.opt.U;em.opt.Bfloatu_U-BUncertainty flag on U-B (1)meta.code.errorcharB-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatV-RcV-R_c_ color indexmagphot.color;em.opt.V;em.opt.RfloatV-IcV-I_c_ color indexmagphot.color;em.opt.V;em.opt.IfloatJ/A+AS/121/369/tableUBVRI photometry of program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryHJDHeliocentric Julian daydtime.epochdoublePhase[0/1[ Phase (1)time.phasefloatVmagV magnitudemagphot.mag;em.opt.VfloatU-B? U-B color indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatV-RV-R color indexmagphot.color;em.opt.V;em.opt.RfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloat