J/A+A/598/A5ivo://CDS.VizieR/J/A+A/598/A5doi:10.26093/cds/vizier.35980005CDSPancino E.Lardo C.Altavilla G.Marinoni S.Ragaini S.Cocozza G.,Bellazzini M.Sabbi E.Zoccali M.Donati P.Heiter U.Koposov S.E.,Blomme R.Morel T.Simon-Diaz S.Lobel A.Soubiran C.Montalban J.,Valentini M.Casey A.R.Blanco-Cuaresma S.Jofre P.Worley C.C.,Magrini L.Hourihane A.Francois P.Feltzing S.Gilmore G.Randich S.,Asplund M.Bonifacio P.Drew J.E.Jeffries R.D.Micela G.Vallenari A.,Alfaro E.J.Allende Prieto C.Babusiaux C.Bensby T.Bragaglia A.,Flaccomio E.Hambly N.Korn A.J.Lanzafame A.C.Smiljanic R.,Van Eck S.Walton N.A.Bayo A.Carraro G.Costado M.T.Damiani F.,Edvardsson B.Franciosini E.Frasca A.Lewis J.Monaco L.,Morbidelli L.Prisinzano L.Sacco G.G.Sbordone L.Sousa S.G.,Zaggia S.Koch A. (Gaia-ESO collaboration)2017-01-24T05:52:58Z2017-01-24T06:48:17ZCDS support team

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

cds-question@unistra.frsurveyschemical-abundancesradial-velocityThe Gaia-ESO survey (GES) is now in its fifth and last year of observations and has produced tens of thousands of high-quality spectra of stars in all Milky Way components. This paper presents the strategy behind the selection of astrophysical calibration targets, ensuring that all GES results on radial velocities, atmospheric parameters, and chemical abundance ratios will be both internally consistent and easily comparable with other literature results, especially from other large spectroscopic surveys and from Gaia. The calibration of GES is particularly delicate because of (i) the large space of parameters covered by its targets, ranging from dwarfs to giants, from O to M stars; these targets have a large wide of metallicities and also include fast rotators, emission line objects, and stars affected by veiling; (ii) the variety of observing setups, with different wavelength ranges and resolution; and (iii) the choice of analyzing the data with many different state-of-the-art methods, each stronger in a different region of the parameter space, which ensures a better understanding of systematic uncertainties. An overview of the GES calibration and homogenization strategy is also given, along with some examples of the usage and results of calibrators in GES iDR4, which is the fourth internal GES data release and will form the basis of the next GES public data release. The agreement between GES iDR4 recommended values and reference values for the calibrating objects are very satisfactory. The average offsets and spreads are generally compatible with the GES measurement errors, which in iDR4 data already meet the requirements set by the main GES scientific goals.2017A&A...598A...5Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/598/A5/table2 (List of GES iDR4 calibrators)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A5/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A5/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A5/table2?GETtext/xml+votable180.050000true101.0094167-1.03238890.0055555555555555566/2923 4298 4376 6219 8767 8845 9216 12341 12405 12953 13301 16603 17028 17425 18366 18907 19091 20562 20975 21017 21594 22078-22079 22118 22300 23096 23497 23731 24715 24777 26302 26552 26975 27255 28664 29951 30122 30215 30293 30295 30301 30464 30466 30472-30473 30878 31087 31293 32969 33281 33321 33323 33330 34073 34242-34243 36035 36693 36697 37294 37636 37933 37938 37944 38566 38936 39672 40021 41507 41513 41522 41763 41852 42248 43228 44542 45721 45944 47022 47125 47168 47952 489641.5062136169708525e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A5?format=asciiOpticaldefaultJ/A+A/598/A5/table2List of GES iDR4 calibratorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCNameUnique GES iDR4 target name, based on object coordinates (HHMMSSss+DDMMSSs) (1)meta.id;meta.maincharTypeCalibrator type (2)src.classcharFieldField or object namemeta.id.parentcharJmag? J magnitude from 2MASS (3)magphot.mag;em.IR.JfloatnullableKmag? K magnitude from 2MASS (3)magphot.mag;em.IR.Kfloatnullable_RAPosition from Name (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from Name (declination part)degpos.eq.dec;meta.mainnullable