J/AJ/168/103ivo://CDS.VizieR/J/AJ/168/103doi:10.26093/cds/vizier.51680103CDSAnthony-Twarog B.J.Deliyannis C.P.Steinhauer A.Sun Q.Twarog B.A.2025-03-03T20:09:16Z2025-01-17T13:36:54ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocityvisible-astronomyspectroscopychemical-abundancesgiant-starsWe have analyzed high-dispersion spectra in the Li 6708{AA} region for 167 stars within the anticenter cluster NGC 2204. From 105 probable members, abundance analysis of 45 evolved stars produces [Fe/H]=-0.40+/-0.12, [Si/Fe]=0.14+/-0.12, [Ca/Fe]=0.29+/-0.07, and [Ni/Fe]=-0.12+/-0.10, where quoted errors are standard deviations. With E(B-V)=0.07 and (m-M)_0_=13.12, appropriate isochrones provide an excellent match from the main sequence through the tip of the giant branch for an age of 1.85+/-0.05Gyr. Li spectrum synthesis produces A(Li) below 1.4 at the base of the red giant branch to a detectable value of -0.4 at the tip. Six probable asymptotic giant branch stars and all but one red clump star have only Li upper limits. A rapidly rotating red giant is identified as a possible Li-rich giant, assuming it is a red clump star. Main-sequence turnoff stars have a well-defined A(Li)=2.83+/-0.03 (sem) down to the Li-dip wall at the predicted mass of 1.29M_{sun}_. Despite having the same isochronal age as the more metal-rich NGC 2506, the luminosity distribution of red giants reflects a younger morphology similar to NGC 7789, possibly indicating a deeper impact of metallicity on stellar structure and A(Li) than previously assumed. As in NGC 2506 and NGC 7789, the NGC 2204 turnoff exhibits a broad range of rotation speeds, making abundance estimation impossible for some stars. The place of the cluster within Galactic A(Li) evolution is discussed.2024AJ....168..103Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/103CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/MNRAS/174/471 : Melotte 66 (Hawarden+, 1976)J/AJ/113/1723 : UBVI photometry in 4 open clusters (Kassis+, 1997)J/ApJ/732/39 : Rotational velocities of K giant stars (Carlberg+, 2011)J/AJ/141/58 : NGC 2204 and NGC 2243 red giant abundances (Jacobson+, 2011)J/MNRAS/423/122 : Abundances of 93 solar-type Kepler targets (Bruntt+, 2012)J/A+A/564/A79 : Proper motions of open clusters from UCAC4 (Dias+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/454/2863 : Teff against colours calibrations (Huang+, 2015)J/AJ/149/121 : WOCS. LXV. Abundances in NGC 6819 (Lee-Brown+, 2015)J/ApJ/807/82 : Rotational velocities of APOKASC red giants (Tayar+, 2015)J/AJ/152/192 : WOCS. LXXII. Study of NGC 2506 (Anthony-Twarog+, 2016)J/AJ/156/37 : Phot. & Li of cool dwarfs in M35 (Anthony-Twarog+, 2018)J/AJ/155/138 : WOCS. LXXVI. Vel & abund. in NGC2506 (Anthony-Twarog+, 2018)J/AJ/158/163 : Li abund. values for stars in NGC 6819 (Deliyannis+, 2019)J/A+A/674/A33 : Gaia synthetic phot. cat. of white dwarfs (Gaia Coll., 2023)J/AJ/165/105 : Stromgren photometry in M67 (Twarog+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/103https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/168/103/table1 (Hydra sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/168/103/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/168/103/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/168/103/table1?GETtext/xml+votable180.050000true93.90276-18.781310.0055555555555555566/20903 20909https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/168/103?format=asciiOpticaldefaultJ/AJ/168/103/table1Hydra sampleRV[-81.4/168.5] Radial velocitykm/sspect.dopplerVelocfloate_RV[0.5/9.6] Uncertainty in RVkm/sstat.error;spect.dopplerVelocfloatGiantDisplay data for this giant (link to Table 4)meta.ref.urlintnullableWEBDA[1115/6330]? WEBDA identifier (Hawarden T.G. 1976MNRAS.174..225H ; <NGC 2204 NNNN> in Simbad)meta.id.crossintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRS[93.6/94.2] Right Ascension (ICRS) at Epoch=2016.0degpos.eq.ra;meta.mainDE_ICRS[-19/-18.4] Declination (ICRS) at Epoch=2016.0degpos.eq.dec;meta.mainWOCSWIYN Open Cluster Survey identifier (G1)meta.id;meta.maincharprimaryVmag[11.49/16.91] Apparent V band magnitudemagphot.mag;em.opt.VfloatB-V[0.36/1.77] The (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatMmMembership: (M)ember, (N)on-membermeta.code.membercharALiDisplay the Lithium results (link to Table 5)meta.ref.urlintnullableNotesAdditional notes (1)meta.notecharGaiaDisplay data from Gaia DR3 (I/355) within 1"meta.ref.urlcharJ/AJ/168/103/table4[Fe/H] for giants, in order of increasing V magnitudeVt[1.3/1.8] Microturbulent velocity {xi}km/sphys.velocfloatWOCSWIYN Open Cluster Survey identifier (among nos 1002 to 14011) (G1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[Fe/H][-0.7/-0.27] Metallicityphys.abund.ZfloatN[10/14] Number of measurementsmeta.numberintMAD[0.02/0.2] Median absolute deviationstat.stdev;stat.medianfloatTeff[3805/5161] Effective temperatureKphys.temperature.effectiveintlogg[1/3.3] Log of surface gravitylog(cm.s**-2)phys.gravityfloatJ/AJ/168/103/table5Synthesis results for LithiumVrot[4.4/47.6] Rotational velocitykm/sstat.error;phys.veloc.rotatfloate_Vrot[0/3]? Vrot uncertaintykm/sstat.errorfloatnullablel_A(Li)[<= ] Limit flag on A(Li)meta.code.error;phys.abundcharA(Li)[-1.5/3] Lithium abundancephys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWOCSWIYN Open Cluster Survey identifier (G1)meta.id;meta.mainchar