J/PASP/117/37ivo://CDS.VizieR/J/PASP/117/37doi:10.26093/cds/vizier.61170037CDSSaha A.Dolphin A.E.Thim F.Whitmore B.2025-09-09T14:13:03Z2007-11-08T22:40:35ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryglobular-star-clusterskron-cousins-photometryThe results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V~21mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a calibration gap if reliable photometry from modest aperture telescopes in space (e.g., the Hubble Space Telescope) or terrestrial telescopes with apertures exceeding 4m is to be done. Sequences like the ones presented here, which cover a large range in brightness as well as color, will allow photometric calibration to be done efficiently and will also make such work less prone to systematic sources of error. Photometry of stars in approximately 10'x10' fields around three globular clusters (NGC 2419, Pal 4, and Pal 14) are presented from data acquired over several photometric nights. In each field, several stars are measured in B, V, R, and I passbands, with standard errors in the mean less than 0.015mag from random errors, to levels fainter than V=21mag.2005PASP..117...37Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/117/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/247 : Ages for globular clusters in the halo (Stetson+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/117/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/117/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/117/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/117/37https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/117/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/117/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/117/37/ngc2419 (Stars in the NGC 2419 field with at least V and I photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/117/37/ngc2419?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/117/37/ngc2419?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/117/37/ngc2419?GETtext/xml+votable180.050000true114.619166738.99533330.005555555555555556Cone search capability for table J/PASP/117/37/pal4 (Stars in the Palomar 4 field with at least V and I photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/117/37/pal4?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/117/37/pal4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/117/37/pal4?GETtext/xml+votable180.050000true172.298166728.872750.005555555555555556Cone search capability for table J/PASP/117/37/pal14 (Stars in the NGC lomar 14 field with at least V and I photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/117/37/pal14?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/117/37/pal14?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/117/37/pal14?GETtext/xml+votable180.050000true242.816083314.897750.0055555555555555566/6389 28577 31722-31723https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/117/37?format=asciiOpticalInfrareddefaultJ/PASP/117/37/ngc2419Stars in the NGC 2419 field with at least V and I photometrye_VmagError in Vmagmagstat.error;phot.mag;em.opt.Vfloato_VmagNumber of observations of Vmagmeta.numberintVChi2? Reduced {chi}^2 (I band)stat.fit.chi2doublenullableImagMean I magnitudemagphot.mag;em.opt.Ifloate_ImagError in Imagmagstat.error;phot.mag;em.opt.Ifloato_ImagNumber of observations of Imagmeta.numberintIChi2? Reduced {chi}^2 (I band)stat.fit.chi2floatnullableRmag? Mean R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Error in Rmagmagstat.error;phot.mag;em.opt.Rfloatnullableo_Rmag? Number of observations of Rmagmeta.numberintnullableRChi2? Reduced {chi}^2 (R band)stat.fit.chi2doublenullableBmag? Mean B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.Bfloatnullableo_Bmag? Number of observations of Bmagmeta.numberintnullableBChi2? Reduced {chi}^2 (B band)stat.fit.chi2doublenullableSDTSDT identification number (2)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleRAJ2000Hour of Right Ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000.0) (1)pos.eq.dec;meta.mainVmagMean V magnitudemagphot.mag;em.opt.VfloatJ/PASP/117/37/pal4Stars in the Palomar 4 field with at least V and I photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleRAJ2000Hour of Right Ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000.0) (1)pos.eq.dec;meta.mainVmagMean V magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.error;phot.mag;em.opt.Vfloato_VmagNumber of observations of Vmagmeta.numberintVChi2? Reduced {chi}^2 (I band)stat.fit.chi2doublenullableImagMean I magnitudemagphot.mag;em.opt.Ifloate_ImagError in Imagmagstat.error;phot.mag;em.opt.Ifloato_ImagNumber of observations of Imagmeta.numberintIChi2? Reduced {chi}^2 (I band)stat.fit.chi2floatnullableRmag? Mean R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Error in Rmagmagstat.error;phot.mag;em.opt.Rfloatnullableo_Rmag? Number of observations of Rmagmeta.numberintnullableRChi2? Reduced {chi}^2 (R band)stat.fit.chi2doublenullableBmag? Mean B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.Bfloatnullableo_Bmag? Number of observations of Bmagmeta.numberintnullableBChi2? Reduced {chi}^2 (B band)stat.fit.chi2doublenullableSDTSDT identification number (2)meta.idcharJ/PASP/117/37/pal14Stars in the NGC lomar 14 field with at least V and I photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleRAJ2000Hour of Right Ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000.0) (1)pos.eq.dec;meta.mainVmagMean V magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.error;phot.mag;em.opt.Vfloato_VmagNumber of observations of Vmagmeta.numberintVChi2? Reduced {chi}^2 (I band)stat.fit.chi2doublenullableImagMean I magnitudemagphot.mag;em.opt.Ifloate_ImagError in Imagmagstat.error;phot.mag;em.opt.Ifloato_ImagNumber of observations of Imagmeta.numberintIChi2? Reduced {chi}^2 (I band)stat.fit.chi2floatnullableRmag? Mean R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Error in Rmagmagstat.error;phot.mag;em.opt.Rfloatnullableo_Rmag? Number of observations of Rmagmeta.numberintnullableRChi2? Reduced {chi}^2 (R band)stat.fit.chi2doublenullableBmag? Mean B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.Bfloatnullableo_Bmag? Number of observations of Bmagmeta.numberintnullableBChi2? Reduced {chi}^2 (B band)stat.fit.chi2doublenullableSDTSDT identification number (2)meta.idchar