J/other/SAAOC/15ivo://CDS.VizieR/J/other/SAAOC/15.30CDSCousins A.W.J.1999-02-25T07:18:02Z1999-02-25T08:17:50ZCDS support team

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

cds-question@unistra.frvisible-astronomyddo-photometryThis paper describes the observations and gives the results of a series of observations of bright E-region stars (Cousins A.W.J. and Stoy R.H., 1962RGOB...49....3C) for use as zero point stars for DDO photometry in the southern hemisphere. The list comprises 45 stars, all brighter than V=6.0, and gives the colours in the instrumental system with internal s.e. +/-0.001mag and m_48_ with s.e. +/-0.002mag. The observed m_48_ is indistinguishable from McClure's system and has the same zero point (+/-0.002mag). The individual E-region zero points have been established with s.e. +/-0.001 relative to the instrumental system, but the colour equations (and zero point corrections) to transform the instrumental colours to McClure's system have still to be finalised. For a description of the DDO photometric system, see e.g. <GCPD/12>1993SAAOC..15...30Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/SAAOC/15.30CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/SAAOC/15.30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/SAAOC/15.30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/SAAOC/15.30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/SAAOC/15.30https://vizier.iucaa.in/viz-bin/votable?-source=J/other/SAAOC/15.30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/SAAOC/15.30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/other/SAAOC/15.30/table1Observed and computed zero point differencesEE-regions (1)meta.id.part;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[ab] Groupmeta.id.part;meta.maincharObs35Observed zero point differences in C(35-38)magphot.colorfloatCor35? Corrected zero point differences in C(35-38)magphot.mag;arith.difffloatnullableComp35? Computed zero point differences in C(35-38)magphot.mag;arith.difffloatnullableObs38Observed zero point differences in C(38-41)magphot.mag;arith.difffloatCor38? Corrected zero point differences in C(38-41)magphot.mag;arith.difffloatnullableComp38? Computed zero point differences in C(38-41)magphot.mag;arith.difffloatnullableObs41Observed zero point differences in C(41-42)magphot.mag;arith.difffloatCor41? Corrected zero point differences in C(41-42)magphot.mag;arith.difffloatnullableComp41? Computed zero point differences in C(41-42)magphot.color;arith.difffloatnullableObs42Observed zero point differences in C(42-45)magphot.color;arith.difffloatCor42? Corrected zero point differences in C(42-45)magphot.mag;arith.difffloatnullableComp42? Computed zero point differences in C(42-45)magphot.color;arith.difffloatnullableObs45Observed zero point differences in C(45-48)magphot.color;arith.difffloatCor45? Corrected zero point differences in C(45-48)magphot.mag;arith.difffloatnullableComp45? Computed zero point differences in C(45-48)magphot.color;arith.difffloatnullableJ/other/SAAOC/15.30/table2Zero point errorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEE-region numbermeta.number;time.periodintzpe135Zero point error for adjacent regions in C(35-38)magstat.errorfloatzpe235Zero point error for alternate regions in C(35-38)magstat.errorfloatzpeM35Means zero point error in C(35-38)magstat.errorfloatzpeR35Revised means zero point error in C(35-38)magstat.errorfloatzpe138Zero point error for adjacent regions in C(38-41)magstat.errorfloatzpe238Zero point error for alternate regions in C(38-41)magstat.errorfloatzpeM38Means zero point error in C(38-41)magstat.errorfloatzpeR38Revised means zero point error in C(38-41)magstat.errorfloatzpe141Zero point error for adjacent regions in C(41-42)magstat.errorfloatzpe241Zero point error for alternate regions in C(41-42)magstat.errorfloatzpeM41Means zero point error in C(41-42)magstat.errorfloatzpeR41Revised means zero point error in C(41-42)magstat.errorfloatzpe142Zero point error for adjacent regions in C(42-45)magstat.errorfloatzpe242Zero point error for alternate regions in C(42-45)magstat.errorfloatzpeM42Means zero point error in C(42-45)magstat.errorfloatzpeR42Revised means zero point error in C(42-45)magstat.errorfloatzpe145Zero point error for adjacent regions in C(45-48)magstat.errorfloatzpe245Zero point error for alternate regions in C(45-48)magstat.errorfloatzpeM45Means zero point error in C(45-48)magstat.errorfloatzpeR45Revised means zero point error in C(45-48)magstat.errorfloatJ/other/SAAOC/15.30/table3DDO photometry of E region stars (Colours in the instrumental system)StarE-region star namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintC(45-48)C(45-48) colourmagphot.colorfloatC(42-45)C(42045) colourmagphot.colorfloatC(41-42)C(41-42) colourmagphot.colorfloatC(38-41)C(38-41) colourmagphot.colorfloatC(35-38)C(35-38) colourmagphot.colorfloatm48? m_48_ magnitudemagphot.mag;em.IR.4-8umfloatnullablen_m48[Vm] Note for variable stars (1)meta.notecharJ/other/SAAOC/15.30/table1aTransmissions of DDO filters used at Cape TownrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintW35? Wavelength in 35 filternmem.wl.effectivefloatnullableT35? Transmition in 35 filter%phys.transmissionfloatnullableW38Wavelength in 38 filternmem.wl.effectivefloatT38Transmition in 38 filter%phys.transmissionfloatW41? Wavelength in 41 filternminstr.filter;em.wl.centralfloatnullableT41? Transmition in 41 filter%phys.transmissionfloatnullableW42? Wavelength in 42 filternminstr.filter;em.wl.centralfloatnullableT42? Transmition in 42 filter%phys.transmissionfloatnullableW45? Wavelength in 45 filternminstr.filter;em.wl.centralfloatnullableT45? Transmition in 45 filter%phys.transmissionfloatnullableW48? Wavelength in 48 filternminstr.filter;em.wl.centralfloatnullableT48? Transmition in 48 filter%phys.transmissionfloatnullableJ/other/SAAOC/15.30/table2bB-V and m_48_-V coloursrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatm48-Vm_48-V colour index -------------------------------------------------------------------------------- Table 1b. Effective Wavelengths, Widths and Second Moments of DDO Filters ------------------------------------------------------------------------- Cousinmagphot.colorfloat