J/A+A/552/A98ivo://CDS.VizieR/J/A+A/552/A98doi:10.26093/cds/vizier.35520098CDSTaris F.Andrei A.Klotz A.Vachier F.Cote R.Bouquillon S.,Souchay J.Lambert S.Anton S.Bourda G.Coward D.2017-11-29T11:49:04Z2013-04-05T08:11:16ZCDS support team

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

cds-question@unistra.frquasarsphotometryThe goal to this work is to observe a first set of 70 extragalactic sources at optical wavelengths that could achieve the link with the ICRF. Variations in the light curves of these targets are connected with astrophysical processes that could produce displacements of the optical photocenter. Such displacements, if they exist, are critical in the framework of the link of reference systems. Four telescope were used to observe the targets at optical wavelengths. Two of them are located in France, one in Chile, and the last in Australia. First observations were carried out during one year and a half in the R and V bands. A new method of characterizing the compactness of the targets was applied to the images obtained.2013A&A...552A..98Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/552/A98CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/552/A98https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/552/A98http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/552/A98https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/552/A98https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/552/A98http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/552/A98GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/552/A98/qsos (List of studied QSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/552/A98/qsos?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/552/A98/qsos?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/552/A98/qsos?GETtext/xml+votable180.050000true2.629208310.97486110.0055555555555555566/579 1702 2143 2721 3096 4054 4820 4964 4992 5306 5458 7570 7857 7896 8057 8487 8915 9711 10163 10501 12301 15023 16027 17579 17857 18624 18871 19271 19567 19831 20144 21960 22363 22659 23127 28383 28454 28517 31190 31430 31894 32261 38383 40479 43399 45011 47014https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/552/A98?format=asciiOpticaldefaultJ/A+A/552/A98/table4List of observations from 2010 to 2012Filter[RV] Filter used (Cousins system)instr.setup;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsTelescope location (1)meta.id;obscharQSOTarget name (HHMM+DDd, B1950)meta.id;meta.maincharJDJulian Date of observationdtime.epochdoublemagMagnitude in filterphot.magfloate_magUncertainty of the magnitude determinationstat.errorfloatJ/A+A/552/A98/qsosList of studied QSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOTarget name (HHMM+DDd, B1950)meta.id;meta.maincharprimaryRAJ2000SIMBAD right ascension (J2000)pos.eq.ra;meta.mainDEJ2000SIMBAD declination (J2000)pos.eq.dec;meta.mainNvrNumber of VR measurementsmeta.numberintLCPlot the Light Curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar