J/A+A/462/1081ivo://CDS.VizieR/J/A+A/462/1081doi:10.26093/cds/vizier.34621081CDSReig P.Larionov V.Negueruela I.Arkharov A.A.Kudryavtseva N.A.2017-06-26T11:50:07Z2007-02-12T09:36:00ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsinfrared-photometryvisible-astronomybroad-band-photometry4U 0115+63 is one of the most active and best studied Be/X-ray transients. Previous studies of 4U 0115+63 have led to the suggestion that 4U 0115+63 undergoes relatively fast quasi-cyclic activity. However, due to the lack of good coverage of the observations, the variability time scales are uncertain. Our objective is to investigate the long-term behaviour of 4U 0115+63/V635 Cas to confirm its quasi-cyclic nature and to explain its correlated optical/IR and X-ray variability. We have performed optical/IR photometric observations and optical spectroscopic observations of 4U 0115+63/V635 Cas over the last decade with unprecedented coverage. We have focused on the H{alpha} line variability and the long-term changes of the photometric magnitudes and colours and investigated these changes in correlation with the X-ray activity of the source.2007A&A...462.1081Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/462/1081CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/462/1081https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/462/1081http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/462/1081https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/462/1081https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/462/1081http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/462/1081GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/462/1081/table2Photometric observationsMJDRModified Julian Date for the R filter observationdtime.epochdoubleRmagR magnitude (1)magphot.mag;em.opt.RfloatMJDI? Modified Julian Date for the I filter observationdtime.epochdoublenullableImag? I magnitude (1)magphot.mag;em.opt.IfloatnullableMJDJ? Modified Julian Date for the J filter observationdtime.epochdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDB? Modified Julian Date for the B filter observationdtime.epochdoublenullableBmag? B magnitude (1)magphot.mag;em.opt.BfloatnullableMJDV? Modified Julian Date for the V filter observationdtime.epochdoublenullableVmag? V magnitude (1)magphot.mag;em.opt.VfloatnullableJmag? J magnitude (1)magphot.mag;em.IR.JfloatnullableMJDH? Modified Julian Date for the H filter observationdtime.epochdoublenullableHmag? H magnitude (1)magphot.mag;em.IR.HfloatnullableMJDK? Modified Julian Date for the K filter observationdtime.epochdoublenullableKmag? K magnitude (1)magphot.mag;em.IR.KfloatnullableJ/A+A/462/1081/table3Log of the optical spectroscopic observationsRange1Wavelength range0.1nmem.wlintRange2Wavelength range0.1nmem.wlintMJDModified Julian Datedtime.epochdoubleEWHaHalpha equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatTelTelescopemeta.id;instr.telcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of observationtime.epochnullablee_EWHarms uncertainty on EWHa0.1nmstat.errorfloatPHaProfile of the Halpha line (1)spect.line.profile;em.line.Halphachar