J/AJ/141/65ivo://CDS.VizieR/J/AJ/141/65doi:10.26093/cds/vizier.51410065CDSDai Y.Wu J.Zhu Z.-H.Zhou X.Ma J.2017-06-30T05:48:57Z2012-08-17T15:11:19ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsphotometryThis paper studies the color behavior of the BL Lac object OJ 287 during an optical outburst. Upon revisiting the data from the OJ 94 monitoring project, and from an analysis of the data obtained with the 60/90cm Schmidt Telescope of NAOC, we found a bluer-when-brighter chromatism in this object. The amplitude of variation tends to decrease with frequency. These results are consistent with the shock-in-jet model. We ran some simulations and confirmed that both amplitude difference and time delay between variations at different wavelengths can result in the bluer-when-brighter phenomenon. Our observations confirmed that OJ 287 underwent a double-peaked outburst about 12 years after 1996, which provides further evidence for the binary black hole model in this object.2011AJ....141...65Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/141/65CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/132/1256 : eim BATC photometry of OJ 287 (Wu+, 2006)J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)J/MNRAS/402/2087 : Optical polarization of OJ 287 in 2005-09 (Villforth+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/141/65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/141/65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/141/65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/141/65https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/141/65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/141/65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.8887364067460483e-19 4.512459730972975e-19OpticaldefaultJ/AJ/141/65/oj287Observational log and results in the BATC c, e, i, m and o bandsFilt[ceimo] Observed filtermeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsUT date of the observationstime.epoch;obsnullableJDJulian Date of the observationdtime.epochdoubleExpExposure timestime.duration;obs.exposureintmagBATC (AB) magnitude in Filtermagphot.magfloate_magUncertainty in magmagstat.error;phot.magfloatdfm11Star 11 BATC differential magnitude (1)magphot.mag;arith.difffloat