J/AJ/155/138ivo://CDS.VizieR/J/AJ/155/138doi:10.26093/cds/vizier.51550138CDSAnthony-Twarog B.J.Lee-Brown D.B.Deliyannis C.P.Twarog B.A.2019-01-07T08:47:50Z2018-11-20T13:23:26ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsgiant-starsradial-velocityvisible-astronomybroad-band-photometrychemical-abundanceseffective-temperatureline-intensitiesHYDRA spectra of 287 stars in the field of NGC 2506 from the turnoff through the giant branch are analyzed. With previous data, 22 are identified as probable binaries; 90 more are classified as potential non-members. Spectroscopic analyses of ~60 red giants and slowly rotating turnoff stars using line equivalent widths and a neural network approach lead to [Fe/H]=-0.27+/-0.07 (s.d.) and [Fe/H]=-0.27+/-0.06 (s.d.), respectively. Li abundances are derived for 145 probable single-star members, 44 being upper limits. Among turnoff stars outside the Li-dip, A(Li)=3.04+/-0.16 (s.d.), with no trend with color, luminosity, or rotation speed. Evolving from the turnoff across the subgiant branch, there is a well-delineated decline to A(Li)~1.25 at the giant branch base, coupled with the rotational spindown from between ~20 and 70 km/s to less than 20 km/s for stars entering the subgiant branch and beyond. A(Li) remains effectively constant from the giant branch base to the red giant clump level. A new member above the clump redefines the path of the first-ascent red giant branch; its Li is 0.6 dex below the first-ascent red giants. With one exception, all post-He-flash stars have upper limits to A(Li), at or below the level of the brightest first-ascent red giant. The patterns are in excellent qualitative agreement with the model predictions for low/intermediate-mass stars which undergo rotation-induced mixing at the turnoff and subgiant branch, first dredge-up, and thermohaline mixing beyond the red giant bump.2018AJ....155..138Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/138CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/113/299 : Abundances and velocities for cluster giants (Minniti 1995)J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001)J/A+A/382/899 : BVI photometry in M67 (Stassun+, 2002)J/AJ/124/601 : Absolute positions and proper motions in NGC 188J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003)J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007)J/A+A/484/609 : BVI photometry and proper motions in M67 (Yadav+, 2008)J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)J/MNRAS/391/1482 : BVIc photometry of Trumpler 20 (Platais+, 2008)J/AJ/137/3743 : Spectroscopic binary orbits in NGC 188 (Geller+, 2009)J/AJ/137/5086 : NGC 188 V12 VI light curves (Meibom+, 2009)J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometryJ/ApJ/695/679 : Stellar rotation in M35 (Meibom+, 2009)J/A+A/515/A100 : VI light curves of NGC 1039 solar-type stars (James+, 2010)J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)J/AJ/139/2034 : NGC 6253 stars equivalent widths (Anthony-Twarog+, 2010)J/ApJ/733/115 : Rotation periods and membership in M34 (Meibom+, 2011)J/MNRAS/413/1024 : Deep proper-motion survey of Blanco 1 (Platais+, 2011)J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)J/AJ/147/138 : Rotational and radial velocities of red giantsJ/AJ/148/38 : WIYN open cluster study. LX. RV survey of NGC 6819J/AJ/148/51 : WIYN Open Cluster. LXI. NGC 6819 photometryJ/AJ/148/61 : WIYN open cluster study. LIX. RVs of NGC 6791J/AJ/148/85 : WIYN open cluster study. LXII. Photometry of M35J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015)J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015)J/AJ/150/97 : Radial velocities in M67. I. 1278 candidate membersJ/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)J/AJ/151/152 : WOCS. LXXI. Spectroscopy of 5 stars in NGC 6791J/AJ/152/192 : WOCS. LXXII. A uvbyCaHb study of NGC 2506J/AJ/153/128 : WOCS. LXXV. Hyades+Praesepe stellar lithium datahttp://webda.physics.muni.cz/ : WEBDA databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/138https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/155/138/table1 (Velocity and membership information for spectroscopic in NGC 2506)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/138/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/138/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/138/table1?GETtext/xml+votable180.050000true119.83854194-10.705721940.0055555555555555566/21586https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/155/138?format=asciiOpticaldefaultJ/AJ/155/138/table1Velocity and membership information for spectroscopic in NGC 2506recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWEBDA[1106/7135] WEBDA identification number (G1)meta.idintRAJ2000Right Ascension in decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (1)degpos.eq.dec;meta.mainProb[0/0.95]? Membership probability (Chiu & Van Altena 1981ApJ...243..827C)stat.probabilityfloatnullableHRV[-45.9/136] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[0.1/19.7] Uncertainty in HRVkm/sstat.errorfloatvsini[7/110.2] Rotational velocitykm/sphys.veloc.rotatfloate_vsini[0.1/10.9] Uncertainty in vsinikm/sstat.error;phys.veloc.rotatfloatB-V[0.196/1.756] B-V color indexmagphot.color;em.opt.B;em.opt.VfloatVmag[11.252/15.584] V band magnitudemagphot.mag;em.opt.VfloatClassMembership classification (2)meta.code.membercharJ/AJ/155/138/table3Abundances for NGC 2506 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWEBDA[1108/7128] WEBDA identification number (G1)meta.idintTeff-NN[4546/5768]? Effective temperature derived with ANNA codeKmeta.code;phys.temperatureintnullable[Fe/H]-NN[-0.48/0.34]? Metallicity derived with ANNA codelog(Sun)phys.abund.Fefloatnullable[Fe/H]-RS[-0.55/0.24] Median metallicity derived with ROBOSPECT codelog(Sun)phys.abund.FefloatMAD[0.01/0.29] Median absolute deviation for Fe abundancestat.stdevfloatNFe[5/17] Number of Fe lines measuredmeta.numberint[Ca/H][-0.54/0.28]? Ca abundance derived with ROBOSPECT codelog(Sun)phys.abundfloatnullable[Si/H][-1.14/0.28] Si abundance derived with ROBOSPECT codelog(Sun)phys.abundfloat[Ni/H][-0.85/0.31] Ni abundance derived with ROBOSPECT codelog(Sun)phys.abundfloate_[Ni/H][0.01/0.19] Uncertainty in [Ni/H]log(Sun)stat.error;phys.abundfloatTeff-ph[4504/7079] Photometric effective temperatureKphys.temperature.effectiveintlogg[1.9/3.7] Surface gravitylog(cm.s**-2)phys.gravityfloatxi[1.31/2.3] Microturbulent velocitykm/sphys.velocfloatJ/AJ/155/138/table4Lithium abundances for NGC 2506 starsl_A(Li)[<] Limit flag on A(Li)meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWEBDA[1108/7132] WEBDA identification number (G1)meta.idintTeff[4505/7600] Effective temperatureKphys.temperature.effectiveintEW(Li)[5/84.4] Equivalent width of Li 6707.8{AA} ({AA})0.1nmspect.line.eqWidthfloatS/N[89/261] Spectra signal-to-noise ratio per pixel at 6680-6690{AA}stat.snr;instr.pixelintFWHM[0.46/3.82] Gaussian full-width at half maximum of the Li 6707.8{AA} line0.1nmspect.line.widthfloatA(Li)[0.2/3.34] Lithium abundancelog(Sun)phys.abundfloate_A(Li)[0.03/0.14]? Uncertainty in A(Li)log(Sun)stat.errorfloatnullablef_A(Li)[1/3]? Flag on A(Li) (1)meta.codeintnullable