J/ApJ/831/L6ivo://CDS.VizieR/J/ApJ/831/L6doi:10.26093/cds/vizier.18319006CDSStassun K.G.Torres G.2017-11-06T12:23:48Z2017-03-14T08:23:36ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvisible-astronomytrigonometric-parallaxeffective-temperatureWe test the parallaxes reported in the Gaia first data release using the sample of eclipsing binaries with accurate, empirical distances from Stassun & Torres (2016, arXiv:1609.02579). We find an average offset of -0.25+/-0.05mas in the sense of the Gaia parallaxes being too small (i.e., the distances too long). The offset does not depend strongly on obvious parameters such as color or brightness. However, we find with high confidence that the offset may depend on ecliptic latitude: the mean offset is -0.38+/-0.06mas in the ecliptic north and -0.05+/-0.09mas in the ecliptic south. The ecliptic latitude dependence may also be represented by the linear relation, {Delta}{pi}~-0.22(+/-0.05)-0.003(+/-0.001)x{beta}mas ({beta} in degrees). Finally, there is a possible dependence of the parallax offset on distance, with the offset becoming negligible for {pi}<~1mas; we discuss whether this could be caused by a systematic error in the eclipsing binary distance scale, and reject this interpretation as unlikely.2016ApJ...831L...6Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/831/L6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)III/254 : 2nd Cat. of RVs with Astrometric Data (Kharchenko+, 2007)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/250 : The Tycho Reference Catalogue (Hog+ 1998)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)J/A+A/523/A48 : Gaia photometry (Jordi+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/831/L6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/831/L6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/831/L6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/831/L6https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/831/L6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/831/L6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/831/L6/table1 (Eclipsing binary and Gaia data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/831/L6/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/831/L6/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/831/L6/table1?GETtext/xml+votable180.050000true19.229663166.81169940.0055555555555555566/14 374 377 1293 1317 1344 1753 2749 2849 3049 3097 3168 3238 3383 3384 3712 3830 4037 5044 6429 6783 7454 8081 8917 9044 9857 12372 12911 13228 13263 13281 13692 13705 13819 14130 14179 14276 14308 14442 14583 14599 14630 14644 14734 14795 14959 15135 15137 15195 15415 15669 15713 15803 15806 16070 16096 16226 18309 18673 18722 20271 20803 20853 21492 21526 21732 21866 22044 22077 22078 22249 22872 22980 23236 23749 23994 24256 24415 25991 26125 27029 28892 30065 30343 30358 30450 31169 31174 31227 31335 31420 31572 31977 32217 32382 32688 32788 33027 35055 35862 36139 36936 37333 37870 37923 37933 38562 40279 40891 41428 41715 42501 43282 47873 47948https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/831/L6?format=asciiOpticaldefaultJ/ApJ/831/L6/table1Eclipsing binary and Gaia dataplxG[0.2/32.3] Gaia parallaxmaspos.parallax.trigfloatGaiaDisplay the Gaia DR1 data within 4"meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameBinary identifiermeta.id;meta.maincharf_Name[cd] Flag on Name (1)meta.codecharTYCTycho catalog identifiermeta.idcharTeff[4330/38000] Effective temperature of primary componentKphys.temperature.effectiveinte_Teff[45/2500] The 1{sigma} uncertainty in TeffKstat.error;phys.temperature.effectiveintVmag[5.6/12.5] The V band magnitudemagphot.mag;em.opt.Vfloatchi2[0.2/86] The {Chi}^2^ of SED fit (2)stat.fit.param;meta.modelledfloatplxEB[0.1/30.7] Eclipsing binary parallaxmaspos.parallax.trigfloatE_plxEB[0.02/1.9] The 1{sigma} upper boundary on plxEBmasstat.error;stat.maxfloate_plxEB[0.02/1.8] The 1{sigma} lower boundary on plxEBmasstat.errorfloate_plxG[0.2/1] The 1{sigma} uncertainty in plxGmasstat.errorfloatRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlchar