J/ApJ/729/L5ivo://CDS.VizieR/J/ApJ/729/L5doi:10.26093/cds/vizier.17299005CDSTycner C.Ames A.Zavala R.T.Hummel C.A.Benson J.A.Hutter D.J.2012-11-11T15:43:45Z2012-10-25T08:42:28ZCDS support team

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

cds-question@unistra.frinterferometryastrometrymultiple-starsIn anticipation of the possible collision between a circumstellar disk and the secondary star in the highly eccentric binary system {delta} Scorpii, high angular resolution interferometric observations have been acquired, aimed at revising the binary parameters. The Navy Prototype Optical Interferometer was used to spatially resolve the binary components in 2000 and over a period between 2005 and 2010. The interferometric observations are used to obtain the angular separations and orientations of the two stellar components at all epochs for which data have been obtained, including 2005 and 2006, for which, based on previous studies, there was some uncertainty as to if the signature of binarity can be clearly detected. The results of this study represent the most complete and accurate coverage of the binary orbit of this system to date and allow for the revised timing of the upcoming periastron passage that will occur in 2011 to be obtained.2011ApJ...729L...5Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/729/L5CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008)I/270 : Catalog of Positions of IR Stellar Sources (CPIRSS) (Hindsley+ 1994)V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996)I/193 : Positions and Proper Motions - South (Bastian+ 1993)J/A+A/408/305 : Spectroscopic observations of delta Sco (Miroshnichenko+, 2003)J/A+A/386/492 : High Angular Resolution Measurements (Richichi, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/729/L5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/729/L5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/729/L5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/729/L5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/729/L5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/729/L5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/729/L5/table1NPOI (Navy Prototype Optical Interferometer) astrometric resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableYearDecimal year of observationyrtime.epoch;obsdoubleSepSeparationmaspos.angDistancefloatPAPosition angle; north through eastdegpos.posAngfloatamajSemi-major axis of error ellipsemasphys.angSize.smajAxis;pos.errorEllipsefloatbminSemi-minor axis of error ellipsemasphys.angSize.sminAxis;pos.errorEllipsefloatPAePosition angle of error ellipsedegpos.posAng;pos.errorEllipsefloat