J/A+A/367/910ivo://CDS.VizieR/J/A+A/367/910doi:10.26093/cds/vizier.33670910CDSCutispoto G.Messina S.Rodono M.2001-05-09T18:45:27Z2001-05-09T18:45:14ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomybroad-band-photometrykron-cousins-photometrystellar-flaresAs a part of an extensive program focused on the global properties and evolution of active stars, high-precision UBV(RI)_c_ and UBV photometry of 31 selected stars is presented. The UBV(RI)_c_ observations were collected at the European Southern Observatory over the 31 December 1992-18 January 1993 and the 20 November-3 December 1993 intervals. Additional UBV photometry obtained by the ``Phoenix" and by the Catania Astrophysical Observatory Automatic Photoelectric Telescopes from 1990 to 1993 is also presented for some of the program stars. 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 (Cat. <I/239>). 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 rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels.2001A&A...367..910Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/367/910CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/115/41 : UBV(RI)c photometry of cool stars (Cutispoto+, 1996)J/A+A/364/205 : UBVy photometry of cool stars (Cutispoto+, 2000)J/A+AS/119/281 : UBV(RI)c photometry of active stars. V (Cutispoto, 1996)J/A+AS/121/369 : UBV(RI)c photometry of active stars. VI (Cutispoto, 1997)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/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+A/367/910https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/367/910http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/367/910https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/367/910https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/367/910http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/367/910GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/367/910/stars (Star positions (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/367/910/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/367/910/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/367/910/stars?GETtext/xml+votable180.050000true17.93-25.9586110.0055555555555555566/421 16903 17753 18007 18234 18918 20492 20618 21069 21386 21765 22805 22820 22823 22909 22939 23342 25192 25452 25793 32861 33034 33116 33966 34130 35150 35773 36073 36664 38259 38268 38957 39306 39383 40321 40784 40809 41679 42216 42315 45387 45741 46574 48274https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/367/910?format=asciiOpticalInfrareddefaultJ/A+A/367/910/starsStar positions (from Simbad)RAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star namemeta.id;meta.maincharprimarySimbadask the SIMBAD data-base about this objectmeta.refcharDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainJ/A+A/367/910/ubvUBV data obtained by the Catania and Phoenix automatic telescopesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharHJDHeliocentric Julian Daydtime.epochdoubleVmagV-band magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableJ/A+A/367/910/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.epochdoubleVmagV-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 indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-Ic colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableJ/A+A/367/910/table1V differential magnitudes of program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star namemeta.id;meta.maincharOnameOther name of the starmeta.idcharEpochMean epoch of observationyrtime.epochfloatCompComparison starmeta.idcharSimbadask the SIMBAD data-base about this objectmeta.refcharCheckCheck starmeta.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.numberintDeltaV? Peak-to-peak amplitude of the V-band light curvemagsrc.var.amplitudefloatnullablePer? Period of variabilityyrtime.perioddoublenullableu_Per[?] ?: unknown value of Permeta.code.errorcharJ/A+A/367/910/table3UBVRI photometry, spectral classification and distance of program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star namemeta.id;meta.maincharEpochMean epoch of observationyrtime.epochfloatVmagV magnitude at maximum luminositymagphot.mag;em.opt.VfloatU-B? U-B colour index at maximum luminositymagphot.color;em.opt.U;em.opt.BfloatnullableB-VB-V colour index at maximum luminositymagphot.color;em.opt.B;em.opt.VfloatV-R? V-Rc colour index at maximum luminositymagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-Ic colour index at maximum luminositymagphot.color;em.opt.V;em.opt.IfloatnullableSpTypeInferred spectral classificationsrc.spTypecharl_DHLimit flag on DHmeta.code.errorcharDH? Distance measured by Hipparcos (<I/239>)pcpos.distancefloatnullableu_DHUncertainty flag on DHmeta.code.errorcharl_dphLimit flag on dphmeta.code.errorchardph? Photometric distance inferred from the adopted spectral classificationpcpos.distancefloatnullableu_dphUncertainty flag on dphmeta.code.errorcharVmax? V-band maximum luminosity ever observedmagphot.mag;em.opt.VfloatnullableJ/A+A/367/910/table4V magnitude and colours for the c and ck stars obtained at ESOrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameComparison or check star namemeta.id;meta.maincharSimbadask the SIMBAD data-base about this objectmeta.refcharVmagV magnitude (1)magphot.mag;em.opt.VfloatU-BU-B colour index (1)magphot.color;em.opt.U;em.opt.Bfloatu_U-B[:] : for errors of the order of 0.02 magmeta.code.errorcharB-VB-V colour index (1)magphot.color;em.opt.B;em.opt.VfloatB-RB-Rc colour index (1)magphot.color;em.opt.B;em.opt.RfloatV-IV-Ic colour index (1)magphot.color;em.opt.V;em.opt.IfloatJ/A+A/367/910/table5Revised spectral classification, based on the latest version of the ASC method, for some active stars previously observed by our grouprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarProgram star namemeta.id;meta.maincharVNameVariable name of program starmeta.idcharSpTypeRevised classificationsrc.spTypecharSpType2Previous classificationsrc.spTypecharr_SpType2Bibcode of SpType2 reference (Cutispoto et al.)meta.refcharDHlLower limit of Hipparcos (<I/239>) distance intervalpcpos.distancefloatDHuUpper limit of Hipparcos (<I/239>) distance intervalpcpos.distancefloatdphPhotometric distance inferred from adopted spectral classificationpcpos.distanceint