J/ApJ/537/101ivo://CDS.VizieR/J/ApJ/537/101doi:10.26093/cds/vizier.15370101CDSFan J.H.Lin R.G.2018-01-04T08:23:11Z2008-06-21T08:33:34ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomybroad-band-photometryPhotometric observations of AGNs are important to construct light curves and to study variability behavior over different timescales. In this paper, the historical optical data compiled from the published literature are presented in tabular form as an optical database for 28 radio-selected BL Lacertae objects. Maximum optical variations are found and compared with the infrared ones. The faintest, brightest, and averaged magnitudes are presented for individual object. The variation is found correlated with polarization. The light curves are shown in figures along with the relation between color index and magnitude. For the color-magnitude relation, two objects, 0735+178 and 0537-441, show evidence that the color index increases with magnitude, indicating that the spectrum flattens when the source brightens, while three objects (0219+428, 1514-241, 2200+420) show the opposite behavior; an object, 0235+164, shows a brightness-dependent color index- magnitude correlation, while the rest of the objects do not show any clear tendency.2000ApJ...537..101Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/537/101CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/114/337 : CCD photometric observations of blazars (Jia Guibin+, 1995)J/A+AS/121/119 : Optical monitoring of gamma-ray loud blazars I (Villata+ 1997)J/A+AS/127/445 : Gamma-ray loud blazars optical monitoring. II (Raiteri+ 1998)J/A+AS/128/315 : BVRI photometry of blazars (Jia Guibin+ 1998)J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/537/101https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/537/101http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/537/101https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/537/101https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/537/101http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/537/101GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/537/101/objects (Positions (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/537/101/objects?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/537/101/objects?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/537/101/objects?GETtext/xml+votable180.050000true12.672083-9.4847220.0055555555555555566/110 579 2414 4695 4770 8487 8751 9711 10422 11430 13927 16059 17516 17579 18209 19271 21968 21972 22363 24608 28454 28492 28517 31894 34123 40692 44247 47375https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/537/101?format=asciiOpticalInfrareddefaultJ/ApJ/537/101/objectsPositions (from Simbad)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharprimaryRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSNameSimbad namemeta.idcharLCPlot of the photometric datameta.ref.urlcharSimbadSimbad column added by the CDScharJ/ApJ/537/101/table2Optical observations of 29 radio-selected BL Lacertae objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharHJDJulian date of observationdtime.epochdoubleUmag? U band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? Error in Umagmagstat.error;phot.mag;em.opt.UfloatnullableBmag? B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag? V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableRmag? R band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Error in Rmagmagstat.error;phot.mag;em.opt.RfloatnullableImag? I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error in Imagmagstat.error;phot.mag;em.opt.Ifloatnullabler_NameReferences for the observations (in refs.dat file)meta.ref;pos.framecharJ/ApJ/537/101/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharbibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar