J/other/Obs/136.ivo://CDS.VizieR/J/other/Obs/136.168CDSOsborn W.Barnard E.E.2018-05-03T14:26:15Z2018-05-03T15:07:25ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsIn 1900 E.E. Barnard published 37 visual observations of Variable 2 (V2) in the globular cluster M13 made in 1899 and 1900. A review of Barnard's notebooks revealed he made many additional brightness estimates up to 1911, and he had also recorded the variations of V1 starting in 1904. These data provide the earliest-epoch light curves for these stars and thus are useful for studying their period changes. This paper presents Barnard's observations of the M13 variables along with their derived heliocentric Julian dates and approximate V magnitudes. These include 231 unpublished observations of V2 and 94 of V1. How these data will be of value for determining period changes by these stars is described.2016Obs...136..168Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/Obs/136.168CatalogResearchIsServedByTAP VizieR generic servicerelated-toIV/26 : Hercules Messier 13 (M13) photometry (Ludendorff, 1905)J/A+A/398/541 : VI light-curves of the variable stars in M13 (Kopacki+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/Obs/136.168https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/Obs/136.168http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/Obs/136.168https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/Obs/136.168https://vizier.iucaa.in/viz-bin/votable?-source=J/other/Obs/136.168http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/Obs/136.168GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/other/Obs/136.168/table4Later observations of Var. 2 and Var. 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateLocal date of observationtime.epoch;obscharHJD? Derived heliocentric Julian Datedtime.epochdoublenullableV2? Derived approximate V magnitude of V2magphot.mag;em.opt.VfloatnullableV1-841? Derived V magnitude of Var 1 (L841 comparison)magphot.mag;em.opt.VfloatnullableV1-np? Derived V magnitude of Var 1 (np comparison)magphot.mag;em.opt.VfloatnullableNotes[1/2]? How sidereal time used in computing HJD (1)meta.noteintnullableJ/other/Obs/136.168/table1Barnard's published observations of Variable 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateLocal date of observationtime.epoch;obscharTimeLocal time of observation (hh:mm)time.epochnullabledmag? Variable to comparison star magnitude differencemagphot.mag;arith.difffloatnullablen_dmag[Max ] Note on dmagmeta.notecharHJDDerived heliocentric Julian Datedtime.epochdoubleVmagDerived approximate V magnitudemagphot.mag;em.opt.VfloatJ/other/Obs/136.168/table2Barnard's unpublished observations of Var. 2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateLocal date of observationtime.epoch;obscharTimeLocal time of observation (hh:mm)time.epochnullabledmag? Variable to comparison star magnitude differencemagphot.mag;arith.difffloatnullableu_dmag[?] Uncertainty flag on dmagmeta.code.errorcharn_dmagNote on dmagmeta.notecharHJDDerived heliocentric Julian Datedtime.epochdoubleVmagDerived approximate V magnitude of Variable 2magphot.mag;em.opt.VfloatJ/other/Obs/136.168/table3Additional unpublished observations of Var. 2NotesNotesmeta.notecharTimeLocal time of observation (hh:mm)time.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateLocal date of observationtime.epoch;obschardmag? Variable to comparison star magnitude differencemagphot.mag;arith.difffloatnullableu_dmag[?] Uncertainty flag on dmagmeta.code.errorcharn_dmagNote on dmagmeta.notecharHJDDerived heliocentric Julian Datedtime.epochdoubleVmagDerived approximate V magnitude of Variable 2magphot.mag;em.opt.VfloatJ/other/Obs/136.168/table5Approximate V magnitudes from platesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlateYerkes 40-inch refractor plate numbermeta.id;instr.platecharDateLocal date of observationtime.epoch;obscharTimeListed exposure time of plate (hh:mm)time.duration;instr.platecharHJDDerived heliocentric Julian Datedtime.epochdoubleV2magDerived approximate V magnitude of Variable 2magphot.mag;em.opt.VfloatV1magDerived approximate V magnitude of Variable 1phot.mag;em.opt.Vfloat