J/AJ/169/226ivo://CDS.VizieR/J/AJ/169/226doi:10.26093/cds/vizier/be-59-72CDSMendez R.A.Tokovinin A.Costa E.Dirk M.2026-07-02T11:47:25Z2026-01-20T08:33:44ZCDS support team

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

cds-question@unistra.frmultiple-starsorbitsinterferometryinfrared-photometryvisible-astronomyastrometryWe present measurements in the context of a survey of southern hemisphere binary and multiple stellar systems observed with the Zorro Speckle dual diffraction-limited optical imaging camera on the 8.1m Gemini South telescope carried out between 2019 and 2023. The overall motivation of our survey and some initial results of these observations are outlined to demonstrate the capabilities and limitations of Zorro. We report on the astrometric characterization of the instrument in terms of the precision and accuracy of our measurements and provide details of our custom-made data reduction pipeline. For targets with separations smaller than 0.4", an overall precision of 1mas in the radial and tangential directions is obtained, while the uncertainty in position angle is 0.2{deg}. Relative astrometry and contrast brightness in the two Zorro filters at 562 and 832nm are reported for 70 pairs on 64 distinct systems (six are triples). Eleven new binaries are found, mostly of small separations (down to 15mas) and large brightness contrast (up to {Delta}m=6 in the red channel). Our results indicate that the Zorro instrument, when properly calibrated, delivers excellent-quality data for visual binary studies of tight and/or faint companions.2025AJ....169..226Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/226CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)V/117A : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)J/A+AS/124/75 : Multiple star catalogue (MSC) (Tokovinin 1997-1999)J/AJ/124/1144 : Orbits of 171 single-lined spect. binaries (Latham, 2002)J/AJ/139/743 : Speckle interferometry in 2008-09 (Tokovinin+, 2010)J/AJ/140/1623 : PHASES diff. astrometry data archive. II. (Muterspaugh+, 2010)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/ApJ/746/101 : Diameters and temperatures of AFG stars (Boyajian+, 2012)J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)J/A+A/546/A69 : Orbits of visual binaries & dynamical masses (Malkov+, 2012)J/MNRAS/437/2303 : Radial velocity curves of alpha Lib A (Fuhrmann+, 2014)J/AJ/149/8 : RV of southern visual multiple stars (Tokovinin+, 2015)J/AJ/150/50 : Speckle interferometry at SOAR in 2014 (Tokovinin+, 2015)J/AJ/152/141 : Solar neighborhood. XXXVII. RVs for M dwarfs (Benedict+, 2016)J/AJ/153/212 : Obs. of binary stars at the WIYN telescope (Horch+, 2017)J/ApJ/838/54 : Accurate astrometry & RVs of 4 multiple syst. (Tokovinin+, 2017)J/ApJS/235/6 : Updated Multiple Star Catalog (MSC): Dec 2023 (Tokovinin, 2018)J/AJ/157/56 : DSSI obs. of binary & trinary star systems (Horch+, 2019)J/ApJ/871/63 : How to constrain your M dwarf. II. Nearby binaries (Mann+, 2019)J/AJ/158/48 : Speckle interferometry at SOAR in 2018 (Tokovinin+, 2019)J/AJ/158/167 : Speckle obs. & orbits of multiple stars (Tokovinin+, 2019)J/AJ/158/222 : Orbits of subsystems in multiple stars. VI. (Tokovinin, 2019)J/AJ/159/233 : Observations of binary stars with the DSSI. IX. (Horch+, 2020)J/AJ/160/7 : 2019 SOAR speckle interfero. of binary stars (Tokovinin+, 2020)J/AJ/160/251 : RVs & orbital data, 5 triple stars (Tokovinin+, 2020)J/AJ/161/144 : Inner & outer orbits in 13 multiple stars syst (Tokovinin, 2021)J/AJ/162/41 : Speckle interferometry at SOAR in 2020 (Tokovinin+, 2021)J/AJ/163/161 : Spectro. of Subsyst. in Multiple Stars. VIII. (Tokovinin, 2022)J/AJ/164/58 : Speckle Interferometry at SOAR in 2021 (Tokovinin+, 2022)J/MNRAS/517/2925 : ORB6 binaries in Gaia EDR3 (Chulkov+, 2022)J/AJ/165/220 : Spectro. orbits of subsyst in multiple stars X (Tokovinin, 2023)http://www.astro.gsu.edu/wds/orb6.html : Sixth Catalog of Orbits of Visualhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/169/226https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/169/226http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/169/226https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/169/226https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/169/226http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/169/226GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/169/226/targets (List of targets (added by CDS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/169/226/targets?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/169/226/targets?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/169/226/targets?GETtext/xml+votable180.050000true11.6597356-54.10148280.0055555555555555566/7 26 322 4184 8316 8409 8493 8577 8747 8766 12295 12355 12455 12465 16667 16704 16723 17125 17136-17137 17641 17645 17691 17721 17723 17732 17842 17844 18237 18281 18293 18367 18658-18659 18823 18826 19733 19784 19786 21690 21774 21784 21901 21912 21939 22036 22249 22314 22412 22472 22476 22827-22828 23485 23621 24615 24625 24731 24735 24800 24835 24839 24848 25019 25113 25145 25360 25410 25444 25941 25948 26142 26172 26654 26677 27379 28693 28725 28760 28882-28883 28890 29224 29241-29242 29246 29291 29384 29439 29613 30296 30300 30804 30845 30859 30939 30965 31265 31267 31390-31391 31501 31511 31760 31817 32170 32343 32852 32859 32861 33116 33341 33357 33377-33378 33428 33796 33838-33839 33920 34001 34065 34069 34088 34093 34182 34442 34464 34972 34997 35118 35206 35773 35775 35910 35913 36834 37032 38208 38215 38258-38259 38655 38986 39008 39060 39090 39096 39440 39674-39675 39692 40196 40228 41426 41465 41653 41660 42171 42416 42424 42431 42560 42758 42863 42956 43013 43023-43024 43060 43140 43153 43498 43754 43807 43902 43962-43963 43985 44584-44585 44676 44807 44833 44847 44892 47013 47024 47028 47098 47807 47855 47866 47904 47916 48313 48316-48317 48455 48515 48545https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/169/226?format=asciiOpticalInfrareddefaultJ/AJ/169/226/targetsList of targets (added by CDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWashington Double Star Catalogue (B/wds) designationmeta.id;meta.maincharprimaryHIP[3640/115038]? Hipparcos number (I/239)meta.idintnullableWDScatNumber of components for this system in the Washington Double Star Catalog (B/wds)meta.numberintnullableNobs2Number of measurements for this system in Table 2meta.numberintnullableNobs4Number of measurements for this system in Table 4meta.numberintnullableSimbadNameSimbad column added by the CDSmeta.idnullable_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.mainJ/AJ/169/226/table2Resolved systems astrometric dataWDSWashington Double Star Catalogue (B/wds) designationmeta.id;meta.maincharprimaryDiscWDS Discoverer designation and system components (1)meta.idcharHIP[4754/114962]? Hipparcos number (I/239)meta.idintnullable(O-C)Sep[-0.37/0.25]? Residual in Sep between measurement and predicted orbit ({Delta}{rho})arcsecstat.fit.residual;pos.angDistancefloatnullableRefOrbit reference from Orb6 (3)meta.refcharCommentsRelevant commentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[19.37/23.51] Epoch in fraction of Julian year - 2000.0yryrtime.epochfloatFilt[562/832] Filter namemeta.id;instr.filterintNcub[1/7] Number of cubes (of 1000 images each) averaged to produce our measurementmeta.numberintPAPosition Angle ({theta})degpos.posAngfloaterrTan[0/10.3]? Tangential formal error (Sep x {sigma}_PA_)masstat.error;pos.posAng;pos.angDistancefloatnullableSep[5e-3/1.63] Angular separation in the sky ({rho})arcsecpos.angDistancefloate_Sep[0/10.5]? Uncertainty in Sepmasstat.error;pos.angDistancefloatnullabledmag[0/7.5] Magnitude contrast in Filtmagphot.mag;arith.difffloatCodeData quality code (2)meta.code.qualchar(O-C)PA[-45/252]? Residual in PA between measurement and predicted orbit ({Delta}{theta})degstat.fit.residual;pos.posAngfloatnullableJ/AJ/169/226/table4Unresolved targets datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDSWashington Double Star Catalogue (B/wds) designationmeta.id;meta.maincharprimaryDiscWDS Discoverer designation and system components (1)meta.idcharHIP[3640/115038]? Hipparcos number (I/239)meta.idintnullableEpoch[19.37/23.51] Epoch in fraction of Julian year - 2000.0yryrtime.epochfloatFilt[466/832] Filter namemeta.id;instr.filterintNcub[1/11] Number of cubes (of 1000 images each) averaged to produce our measurementmeta.numberintSepMin[0.01/0.06] Angular resolution or minimum separationarcsecpos.angResolutionfloatDet0.15[0/9.8] Detection limit, possible companions, 5{sigma} at 0.15"maginstr.sensitivityfloatDet1.00[0/7.8] Detection limit, possible companions, 5{sigma} at 1.00"maginstr.sensitivityfloatCommentsRelevant comments (2)meta.notechar