J/A+A/575/A26ivo://CDS.VizieR/J/A+A/575/A26doi:10.26093/cds/vizier.35750026CDSCreevey O.L.Thevenin F.Berio P.Heiter U.von Braun K.Mourard D.,Bigot L.Boyajian T.S.Kervella P.Morel P.Pichon B.Chiavassa A.,Nardetto N.Perraut K.Meilland A.Mc Alister H.A.ten Brummelaar T.A.,Farrington C.Sturmann J.Sturmann L.Turner N.2015-07-15T18:40:03Z2015-02-16T16:02:27ZCDS support team

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

cds-question@unistra.frpopulation-ii-starsastronomical-modelsstellar-agesMetal-poor halo stars are important astrophysical laboratories that allow us to unravel details about many aspects of astrophysics, including the chemical conditions at the formation of our Galaxy, understanding the processes of diffusion in stellar interiors, and determining precise effective temperatures and calibration of colour-effective temperature relations. To address any of these issues the fundamental properties of the stars must first be determined. HD 140283 is the closest and brightest metal-poor Population II halo star (distance = 58pc and V=7.21), an ideal target that allows us to approach these questions, and one of a list of 34 benchmark stars defined for Gaia astrophysical parameter calibration. In the framework of characterizing these benchmark stars, we determined the fundamental properties of HD 140283 (radius, mass, age, and effective temperature) by obtaining new interferometric and spectroscopic measurements and combining them with photometry from the literature. The interferometric measurements were obtained using the visible interferometer VEGA on the CHARA array and we determined a 1D limb-darkened angular diameter of {theta}_1D_=0.353+/-0.013-milliarcsec.2015A&A...575A..26Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/575/A26CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)VI/137 : GaiaSimu Universe Model Snapshot (Robin+, 2012)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)J/A+A/565/A11 : Gaia photometry for white dwarfs (Carrasco+, 2014)J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)J/A+A/548/A42 : HD 140283 average spectrum (370-1040nm) (Siqueira Mello+ 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/575/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/575/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/575/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/575/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/575/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/575/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/575/A26/table12Combinations of model stellar properties of the star HD 140283recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMass[0.77/0.83] Adopted mass of HD140283solMassphys.massfloatYi[0.245/0.26] Adopted initial helium mass fraction (Y_i_)phys.abund.YfloatAV[0/0.1] Adopted total absorption (A_V_)magphys.absorptionfloatAge[9.91/14.29] Age of HD140283 for the adopted values of Mass, Y_i_ and A_V_Gyrtime.agefloatalpha[0.42/1.45] Corresponding mixing-length parameter {alpha}stat.paramfloatM/I[M/I] Result of Model, or Interpolation (1)meta.codechar