J/A+A/493/1093ivo://CDS.VizieR/J/A+A/493/1093doi:10.26093/cds/vizier.34931093CDSFernandez-Lajus E.Farina C.Torres A.F.Schwartz M.A.Salerno N.,Calderon J.P.von Essen C.Calcaferro L.M.Giudici F.Llinares C.,Niemela V.2017-06-30T05:49:09Z2009-03-07T07:39:58ZCDS support team

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

cds-question@unistra.frvariable-starsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryThe periodicity of 5.5 years for some observational events occurring in {eta} Carinae manifests itself across a large wavelength range and has been associated with its binary nature. These events are supposed to occur when the binary components are close to periastron. To detect the previous periastron passage of {eta} Car in 2003, we started an intensive, ground-based, optical, photometric observing campaign. We continued observing the object to monitor its photometric behavior and variability across the entire orbital cycle. Our observation program consisted of daily differential photometry from CCD images, which were acquired using a 0.8m telescope and a standard BVRI filter set at La Plata Observatory. The photometry includes the central object and the surrounding Homunculus nebula. We present up-to-date results of our observing program, including homogeneous photometric data collected between 2003 and 2008. Our observations demonstrated that {eta} Car has continued increasing in brightness at a constant rate since 1998. In 2006, it reached its brightest magnitude (V~4.7) since about 1860s. The object then suddenly reverted its brightening trend, fading to V=5.0 at the beginning of 2007, and has maintained a quite steady state since then. We continue the photometric monitoring of {eta} Car in anticipation of the next "periastron passage", predicted to occur at the beginning of 2009.2009A&A...493.1093Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/493/1093CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/304/415 : uvby-Hbeta photometry of eta Car 1992-94 (van Genderen+, 1995)J/A+A/343/847 : Geneva Photometry of eta Car (van Genderen+ 1999)J/A+A/419/215 : Emission lines of eta Car (Hartman+, 2004)J/AJ/129/2018 : RXTE scaled fluxes of eta Car (Corcoran+, 2005)J/ApJS/71/983 : UV spectrum of eta Car (Viotti+ 1989)J/ApJS/157/138 : UV spectrum of eta Car (Nielsen+, 2005)J/ApJS/163/173 : UV spectrum of eta Car in 2003.5 (Gull+, 2006)J/ApJS/168/289 : NUV spectrum of eta Car in 2003.5 (Nielsen+, 2007)J/A+A/493/1093 : BVRI light curves of eta Car (Fernandez-Lajus+, 2009)J/ApJS/181/473 : Eta Carinae: visible and near-IR analysis (Nielsen+, 2009)J/other/NewA/15.108 : UBVRIHalpha of eta Car in 2009 (Fernandez-Lajus+ 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/493/1093https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/493/1093http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/493/1093https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/493/1093https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/493/1093http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/493/1093GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/A+A/493/1093/table3Visual light curve of eta Car 1822-2008recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintYearObservation dateyrtime.epoch;obsfloatVmag{eta} Car visual magnitudemagphot.mag;em.opt.VfloatBibCodeReferencemeta.ref;pos.framecharJ/A+A/493/1093/table2BVRI light curves of eta CarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian datedtime.epochdoubleBand[BVRI] Photometric bandinstr.bandpasscharDmag1{eta} Car mean differential magnitudemagphot.mag;arith.difffloate_Dmag1{eta} Car rms error of the mean magnitudemagstat.error;phot.magfloatDmag2? CPD-59 2627 mean differential magnitudemagphot.mag;arith.difffloatnullablee_Dmag2? CPD-59 2627 rms error of the mean magnitudemagstat.error;phot.magfloatnullableDmag3? CPD-59 2628 mean differential magnitudemagphot.mag;arith.difffloatnullablee_Dmag3? CPD-59 2628 rms error of the mean magnitudemagstat.error;phot.magfloatnullableFWHMFull width half maximum of HDE303308arcsecspect.line.widthfloatNNumber of images considered for the mean valuesmeta.numberint