J/MNRAS/475/1725ivo://CDS.VizieR/J/MNRAS/475/1725doi:10.26093/cds/vizier.74751725CDSGuerrero C.A.Orlov V.G.Borges Fernandes M.Angeles F.2024-08-18T20:17:54Z2021-05-05T07:55:30ZCDS support team

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

cds-question@unistra.frmultiple-starsinterferometryWe present speckle interferometric measurements of binary stars performed during 2011 February and April with the 1.5-m telescope and during 2011 July and November with the 2.1-m telescope of the Observatorio Astronomico Nacional, San Pedro Martir, Mexico, focusing on objects from the Washington Double Star Catalog with separations less than 1 arcsec. Among these objects, we have been interested in performing a follow-up observation of new double stars discovered by Hipparcos. For these observations, we developed a new detector, which is a combination of CCD Watec 120N with a third generation image intensifier. This image intensifier allows us to perform near-infrared speckle interferometric observations for the first time. In this paper, we report 761 astrometric measurements of 478 pairs, with angular separations ranging from 0.09 to 2.61-arcsec. We found that 722 of our measured separations are smaller than 1-arcsec. We estimated a mean error in separation of 16mas and 1.29{deg} in position angle. In order to overcome the usual 180{deg} ambiguity inherent to speckle measurements, we created a shift-and-add reconstructed image of each source, to establish the true quadrant of the secondary star. We confirmed 40 double stars discovered by Hipparcos and found 4 field stars resolved as interferometric pairs for the first time, with separations smaller than 0.60-arcsec.2018MNRAS.475.1725Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/475/1725CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/475/1725https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/475/1725http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/475/1725https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/475/1725https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/475/1725http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/475/1725GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/475/1725/table3Multi-band astrometry of known pairs observed with the 1.5m telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS name (HHMMs+DDMM, J2000)meta.id;meta.maincharn_WDS[*, HC] Note on WDS (1)meta.notecharNameDiscoverer designationmeta.idcharEpochEpoch (Epoch-2011)yrtime.epochfloatthetaPosition angledegpos.posAngfloate_thetarms uncertainty on thetadegstat.error;pos.posAngfloatrhoSepration anglearcsecpos.angDistance;src.orbitalfloate_rhorms uncertainty on rhoarcsecstat.errorfloatthetaO-C? Observed minus computed Position angledegpos.posAng;stat.fit.omcfloatnullablerhoO-C? Observed minus computed Sepration angledegpos.posAng;stat.fit.omcfloatnullableRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharlambdaWavelength (538, 630 or 894)nmem.wlintJ/MNRAS/475/1725/table4Multi-band astrometry of known pairs observed with the 2.1m telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWDS name (HHMMs+DDMM, J2000)meta.id;meta.maincharn_WDS[*, HC] Note on WDS (1)meta.notecharNameDiscoverer designationmeta.idcharEpochEpoch (Epoch-2011)yrtime.epochfloatthetaPosition angledegpos.posAngfloate_thetarms uncertainty on thetadegstat.error;pos.posAngfloatrhoSepration anglearcsecpos.angDistance;src.orbitalfloate_rhorms uncertainty on rhoarcsecstat.errorfloatthetaO-C? Observed minus computed Position angledegpos.posAng;stat.fit.omcfloatnullablerhoO-C? Observed minus computed Sepration angledegpos.posAng;stat.fit.omcfloatnullableRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharlambdaWavelength (538, 630 or 894)nmem.wlintJ/MNRAS/475/1725/refsReferencesRefReference codemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTextReference and commentsmeta.ref;pos.framechar