J/ApJ/810/148ivo://CDS.VizieR/J/ApJ/810/148doi:10.26093/cds/vizier.18100148CDSCarretta E.2017-06-21T08:22:53Z2016-01-19T07:32:22ZCDS support team

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

cds-question@unistra.frmetallicityglobular-star-clustersgiant-starsThe chemical composition of multiple populations in the massive globular cluster (GC) NGC 2808 is addressed with the homogeneous abundance reanalysis of 140 red giant branch stars. UVES spectra for 31 stars and GIRAFFE spectra for the other giants were analyzed with the same procedures used for about 2500 giants in 23 GCs in our FLAMES survey, deriving abundances of Fe, O, Na, Mg, Si, Ca, Ti, Sc, Cr, Mn, and Ni. Iron, elements from {alpha} capture, and those in the Fe group do not show intrinsic scatter. On our UVES scale, the metallicity of NGC 2808 is [Fe/H]=-1.29+/-0.005+/-0.034 (+/-statistical+/-systematic error) with {sigma}=0.030 (31 stars). The main features related to proton-capture elements are retrieved, but the improved statistics and the smaller associated internal errors allow us to uncover five distinct groups of stars along the Na-O anticorrelation. We observe large depletions in Mg, anticorrelated with enhancements of Na and also Si, suggestive of unusually high temperatures for proton captures. About 14% of our sample is formed by giants with solar or subsolar [Mg/Fe] ratios. Using the [Na/Mg] ratios, we confirm the presence of five populations with different chemical compositions that we call P1, P2, I1, I2, and E in order of decreasing Mg and increasing Na abundances. Statistical tests show that the mean ratios in any pair of groups cannot be extracted from the same parent distribution. The overlap with the five populations recently detected from UV photometry is good but not perfect, confirming that more distinct components probably exist in this complex GC.2015ApJ...810..148Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/810/148CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/MNRAS/449/4038 : Li abundance of giants in 3 GCs (D'Orazi+, 2015)J/A+A/578/A116 : Abundances of red giants in NGC6093 (M80) (Carretta+, 2015)J/A+A/564/A60 : NGC 4833 Na-O measured with FLAMES (Carretta+, 2014)J/MNRAS/437/1609 : NGC 2808 HB stars abundances (Marino+, 2014)J/A+A/557/A138 : Detailed chemical abundances in NGC 362 (Carretta+ 2013)J/ApJ/769/40 : Potassium abundance in red giants of GCs (Carretta+, 2013)J/ApJ/760/86 : Equivalent widths for 13 NGC2419 RGB stars (Cohen+, 2012)J/ApJ/750/L14 : Abundances of red giants in NGC 6752 (Carretta+, 2012)J/A+A/542/A129 : NGC 2808 central kinematics (Luetzgendorf+, 2012)J/A+A/534/A123 : Horizontal branch stars in NGC 2808 (Gratton+, 2011)J/A+A/533/A69 : Spectroscopy of 124 RGB stars in NGC 1851 (Carretta+, 2011)J/A+A/528/A127 : Radial velocities in the globular NGC 2808 (Moni Bidin+, 2011)J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)J/ApJ/712/L21 : Calcium abundances in 17 globular clusters (Carretta+, 2010)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)J/A+A/464/967 : Abundances of red giants in NGC 6388 (Carretta+, 2007)J/A+A/464/953 : Abundances of red giants in NGC 6441 (Gratton+, 2007)J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carretta+, 2007)J/A+A/464/927 : Abundances of red giants in NGC 6752 (Carretta+, 2007)J/A+A/455/271 : Abundances of red giants in NGC 6441 (Gratton+, 2006)J/AJ/131/1766 : Abundances and equivalent widths in NGC 2808 (Carretta, 2006)J/A+A/417/597 : Radial velocities in 4 globular clusters (Recio-Blanco+, 2004)J/A+A/413/343 : RGB stars in NGC 2808 (Cacciari+, 2004)J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)J/AJ/121/327 : Metal Abundances of NGC6819 Red Clump Stars (Bragaglia+, 2001)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)J/A+A/350/955 : Atmospheric parameters in metal-poor stars II (Gratton+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/810/148https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/810/148http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/810/148https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/810/148https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/810/148http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/810/148GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/810/148/abund (Iron abundances, proton-capture element abundances and {alpha}-capture and Fe-peak element abundances in stars of NGC 2808)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/810/148/abund?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/810/148/abund?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/810/148/abund?GETtext/xml+votable180.050000true138.0119625-64.82613060.0055555555555555566/37294 37636https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/810/148?format=asciidefaultJ/ApJ/810/148/table6Abundances of TiII, CrII, and Mn in stars of NGC 2808 observed with UVESrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_IDObservation flag; U: observed with UVES; otherwise GIRAFFEmeta.codecharID[7536/56032] Star ID from Bedin et al. (2000A&A...363..159B)meta.id;meta.maininto_[Ti/Fe]II[5/12]? Number of Ti linesmeta.numberintnullable[Ti/Fe]II[0.1/0.3]? Abundance [Ti/Fe]IIlog(Sun)phys.abundfloatnullablee_[Ti/Fe]II[0.04/0.5]? rms uncertainty on [Ti/Fe]IIlog(Sun)stat.error;phys.abundfloatnullableo_[Cr/Fe]II[2/17] Number of Cr linesmeta.numberint[Cr/Fe]II[-0.09/0.04] Abundance [Cr/Fe]IIlog(Sun)phys.abundfloate_[Cr/Fe]II[0.05/0.4] rms uncertainty on [Cr/Fe]IIlog(Sun)stat.error;phys.abundfloato_[Mn/Fe][3] Number of Mn linesmeta.numberint[Mn/Fe][-0.5/-0.2] Abundance [Mn/Fe]log(Sun)phys.abundfloate_[Mn/Fe][0.009/0.3] rms uncertainty on [Mn/Fe]log(Sun)stat.error;phys.abundfloatJ/ApJ/810/148/abundIron abundances, proton-capture element abundances and {alpha}-capture and Fe-peak element abundances in stars of NGC 2808log(g)[0.3/2.5] Stellar Surface Gravitylog(cm.s**-2)phys.gravityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_IDObservation flag; U: observed with UVES; otherwise GIRAFFEmeta.codecharID[7183/56924] Star ID from Bedin et al. (2000A&A...363..159B)meta.id;meta.mainintTeff[3863/5036] Stellar Effective TemperatureKphys.temperature.effectiveint[A/H][-1.3/-1] Input metallicitylog(Sun)phys.abund.Zfloatvt[0.6/2] Microturbulent velocitykm/sphys.velocfloato_[Fe/H]I[15/93] Number of FeI linesmeta.numberint[Fe/H]I[-1.3/-1] Abundance [Fe/H]Ilog(Sun)phys.abund.Fefloate_[Fe/H]I[0.03/0.2] rms uncertainty on [Fe/H]Ilog(Sun)stat.error;phys.abund.Fefloato_[Fe/H]II[3/11]? Number of FeII linesmeta.numberintnullable[Fe/H]II[-1.3/-1]? Abundance [Fe/H]IIlog(Sun)phys.abund.Fefloatnullablee_[Fe/H]II[0.005/0.3]? rms uncertainty on [Fe/H]IIlog(Sun)stat.error;phys.abund.Fefloatnullableo_[O/Fe][0/2] Number of O linesmeta.numberint[O/Fe][-1/0.5]? Abundance [O/Fe]log(Sun)phys.abundfloatnullablee_[O/Fe][0/0.2]? rms uncertainty on [O/Fe]log(Sun)stat.error;phys.abundfloatnullableo_[Na/Fe][1/4] Number of Na linesmeta.numberint[Na/Fe][-0.2/0.9]? Abundance [Na/Fe]log(Sun)phys.abundfloatnullablee_[Na/Fe][0/0.2]? rms uncertainty on [Na/Fe]log(Sun)stat.error;phys.abundfloatnullableo_[Mg/Fe][0/3] Number of Mg linesmeta.numberint[Mg/Fe][-0.2/0.5]? Abundance [Mg/Fe]log(Sun)phys.abundfloatnullablee_[Mg/Fe][0.002/0.2]? rms uncertainty on [Mg/Fe]log(Sun)stat.error;phys.abundfloatnullableo_[Si/Fe][2/13] Number of Si linesmeta.numberint[Si/Fe][0.1/0.5] Abundance [Si/Fe]log(Sun)phys.abundfloate_[Si/Fe][0.02/0.3] rms uncertainty on [Si/Fe]log(Sun)stat.error;phys.abundfloatlimO[0/1] Flag: Upper limits (limO=0); detections (=1) for Ometa.codeinto_[Ca/Fe][1/18] Number of Ca linesmeta.numberint[Ca/Fe][0.2/0.5] Abundance [Ca/Fe]log(Sun)phys.abundfloate_[Ca/Fe][0.02/0.3]? rms uncertainty on [Ca/Fe]log(Sun)stat.error;phys.abundfloatnullableo_[Ti/Fe]I[2/10] Number of Ti linesmeta.numberint[Ti/Fe]I[0.1/0.3] Abundance [Ti/Fe]Ilog(Sun)phys.abundfloate_[Ti/Fe]I[0/0.2] rms uncertainty on [Ti/Fe]Ilog(Sun)stat.error;phys.abundfloato_[Sc/Fe]II[2/8] Number of Sc linesmeta.numberint[Sc/Fe]II[-0.1/0.1] Abundance [Sc/Fe]IIlog(Sun)phys.abundfloate_[Sc/Fe]II[0.006/0.3] rms uncertainty on [Sc/Fe]IIlog(Sun)stat.error;phys.abundfloato_[Cr/Fe]I[1/26] Number of Cr linesmeta.numberint[Cr/Fe]I[-0.2/0.03] Abundance [Cr/Fe]Ilog(Sun)phys.abundfloate_[Cr/Fe]I[0.04/0.3]? rms uncertainty on [Cr/Fe]Ilog(Sun)stat.error;phys.abundfloatnullableo_[Ni/Fe][2/32] Number of Ni linesmeta.numberint[Ni/Fe][-0.2/-0.02] Abundance [Ni/Fe]log(Sun)phys.abundfloate_[Ni/Fe][0.007/0.3] rms uncertainty on [Ni/Fe]log(Sun)stat.error;phys.abundfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions provided by the author from Carretta (2014ApJ...795L..28C) and Carretta et al. (2006A&A...450..523C) (right ascension part)degpos.eq.ra;meta.main_DEPositions provided by the author from Carretta (2014ApJ...795L..28C) and Carretta et al. (2006A&A...450..523C) (declination part)degpos.eq.dec;meta.main