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J/ApJ/722/1373       ω Centauri giants abundances         (Johnson+, 2010)

Chemical abundances for 855 giants in the globular cluster omega Centauri (NGC 5139). Johnson C.I., Pilachowski C.A. <Astrophys. J., 722, 1373-1410 (2010)> =2010ApJ...722.1373J
ADC_Keywords: Abundances ; Equivalent widths ; Stars, giant ; Clusters, globular Keywords: globular clusters: general - globular clusters: individual (Omega Centauri) - stars: abundances - stars: Population II Abstract: We present elemental abundances for 855 red giant branch (RGB) stars in the globular cluster Omega Centauri (ω Cen) from spectra obtained with the Blanco 4m telescope and Hydra multifiber spectrograph. The sample includes nearly all RGB stars brighter than V=13.5 and spans ω Cen's full metallicity range. The heavy α elements (Si, Ca, and Ti) are generally enhanced by ±0.3 dex and exhibit a metallicity-dependent morphology that may be attributed to mass and metallicity-dependent Type II supernova (SN) yields. The heavy α and Fe-peak abundances suggest minimal contributions from Type Ia SNe. The light elements (O, Na, and Al) exhibit >0.5 dex abundance dispersions at all metallicities, and a majority of stars with [Fe/H]>-1.6 have [O/Fe], [Na/Fe], and [Al/Fe] abundances similar to those in monometallic globular clusters, as well as O-Na, O-Al anticorrelations and the Na-Al correlation in all but the most metal-rich stars. A combination of pollution from intermediate-mass asymptotic giant branch stars and in situ mixing may explain the light element abundance patterns. A large fraction (27%) of ω Cen stars are O-poor ([O/Fe]<0) and are preferentially located within 5'-10' of the cluster center. The O-poor giants are spatially similar, located in the same metallicity range, and are present in nearly equal proportions to blue main-sequence stars. This suggests that the O-poor giants and blue main-sequence stars may share a common origin. [La/Fe] increases sharply at [Fe/H]≳-1.6, and the [La/Eu] ratios indicate that the increase is due to almost pure s-process production. Description: The observations for this project were taken at the Cerro Tololo Inter-American Observatory (CTIO) using the Blanco 4m telescope equipped with the Hydra multifiber positioner and bench spectrograph. We obtained all of the spectra in two separate runs spanning 2008 March 24-28 and 2009 March 6-8. We employed two different wavelength setups encompassing ∼6135-6365 and ∼6500-6800Å with wavelength centers near 6250 and 6670Å, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 75 855 Star identifiers, photometry, and atmospheric parameters table3.dat 59 855 Fe atomic parameters, equivalent widths, and solar abundances (6151.62-6265.14Å) table3b.dat 55 855 Fe atomic parameters, equivalent widths, and solar abundances (6270.23-6247.56Å) table4.dat 60 855 O-Eu atomic parameters, equivalent widths, and solar abundances (6300.31-6305.66Å) table4b.dat 58 855 O-Eu atomic parameters, equivalent widths, and solar abundances (6245.62-6645.06Å) table5.dat 105 855 Chemical abundance ratios table6.dat 41 855 Chemical abundance measurement uncertainties (FeI, FeII, Na, Al, Si) table6b.dat 40 855 Chemical abundance measurement uncertainties (Ca, ScI, ScII, Ti, Ni) ion.dat 28 57 Wavelengths explanations for tables 3 to 4b
See also: J/A+A/534/A53 : EW of 18 subgiant of ω Cen (Pancino+, 2011) J/A+A/527/A18 : EW of 6 subgiants of ω Cen (Pancino+, 2011) J/A+A/519/L3 : Lithium content of ω Cen (Monaco+, 2010) J/ApJ/698/2048 : Abundances of red giants in ω Cen (Johnson+, 2009) J/MNRAS/399/195 : Blue and red spectra of ω Cen (Van Loon+, 2009) J/ApJ/681/1505 : Abundances of red giants in ω Cen (Johnson+, 2008) J/ApJ/667/911 : Abundances of ω Cen (Stanford+, 2007) J/ApJ/640/L43 : Metallicities of RR Lyrae stars in Omega Cen (Sollima+, 2006) J/ApJ/647/1075 : Age-metallicity relation of ω Cen (Stanford+, 2006) J/AJ/119/1824 : Caby photometry of Ω Centauri (Rey+, 2000) J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000) J/ApJ/462/241 : Ca abundance for Omega Cen red giants (Norris+ 1996) J/ApJS/99/637 : Equivalent widths for 54 red giants (Norris+ 1995) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) (1) 7- 10 I4 --- ROA ? Woolley (1966ROAn....2....1W) identifier (<NGC 5139 NNNN> in Simbad) 12- 17 F6.3 mag Vmag The V band magnitude 19- 23 F5.3 mag B-V The (B-V) color index 25- 30 F6.3 mag Jmag 2MASS J band magnitude 32- 37 F6.3 mag Hmag 2MASS H band magnitude 39- 44 F6.3 mag Kmag 2MASS KS band magnitude 46- 49 I4 K Teff Effective temperature 51- 54 F4.2 [cm/s2] log(g) Log of the surface gravity 56- 60 F5.2 [Sun] [Fe/H] Average [Fe/H] metallicity 62- 65 F4.2 km/s Vt Microturbulence velocity 68 A1 --- l_S/N-6250 Limit flag on S/N-6250 69- 71 I3 --- S/N-6250 Signal-to-noise at 6250 Angstroms 73- 75 I3 --- S/N-6650 ? Signal-to-noise at 6650 Angstroms
Note (1): The possible carbon stars shown in Figures 1 and 3 are: LEID 32059, 33062, 35250, 37199, 39105, 41071, 42044, 43199, 43368, 44126, 44262, 44361, 44484, and 52030.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) 7- 9 I3 10-13m EW6151.62 ? Equivalent width of Fe I 6151.62 (mÅ) 11- 13 I3 10-13m EW6157.73 ? Equivalent width of Fe I 6157.73 (mÅ) 15- 16 I2 10-13m EW6165.36 ? Equivalent width of Fe I 6165.36 (mÅ) 18- 20 I3 10-13m EW6173.34 ? Equivalent width of Fe I 6173.34 (mÅ) 22- 24 I3 10-13m EW6180.20 ? Equivalent width of Fe I 6180.20 (mÅ) 26- 28 I3 10-13m EW6187.99 ? Equivalent width of Fe I 6187.99 (mÅ) 30- 32 I3 10-13m EW6200.32 ? Equivalent width of Fe I 6200.32 (mÅ) 34- 36 I3 10-13m EW6219.28 ? Equivalent width of Fe I 6219.28 (mÅ) 38- 39 I2 10-13m EW6226.74 ? Equivalent width of Fe I 6226.74 (mÅ) 41- 43 I3 10-13m EW6229.23 ? Equivalent width of Fe I 6229.23 (mÅ) 45- 47 I3 10-13m EW6232.64 ? Equivalent width of Fe I 6232.64 (mÅ) 49- 51 I3 10-13m EW6246.32 ? Equivalent width of Fe I 6246.32 (mÅ) 53- 55 I3 10-13m EW6252.56 ? Equivalent width of Fe I 6252.56 (mÅ) 57- 59 I3 10-13m EW6265.14 ? Equivalent width of Fe I 6265.14 (mÅ)
Byte-by-byte Description of file: table3b.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. 2000 identifier (G1) 7- 9 I3 10-13m EW6270.23 ? Equivalent width of Fe I 6270.23 (mÅ) 11- 12 I2 10-13m EW6271.28 ? Equivalent width of Fe I 6271.28 (mÅ) 14- 15 I2 10-13m EW6290.97 ? Equivalent width of Fe I 6290.97 (mÅ) 17- 19 I3 10-13m EW6297.79 ? Equivalent width of Fe I 6297.79 (mÅ) 21- 23 I3 10-13m EW6301.50 ? Equivalent width of Fe I 6301.50 (mÅ) 25- 27 I3 10-13m EW6302.49 ? Equivalent width of Fe I 6302.49 (mÅ) 29- 30 I2 10-13m EW6311.50 ? Equivalent width of Fe I 6311.50 (mÅ) 32- 33 I2 10-13m EW6315.81 ? Equivalent width of Fe I 6315.81 (mÅ) 35- 37 I3 10-13m EW6322.69 ? Equivalent width of Fe I 6322.69 (mÅ) 39- 41 I3 10-13m EW6335.33 ? Equivalent width of Fe I 6335.33 (mÅ) 43- 45 I3 10-13m EW6336.83 ? Equivalent width of Fe I 6336.83 (mÅ) 47- 49 I3 10-13m EW6344.15 ? Equivalent width of Fe I 6344.15 (mÅ) 51- 52 I2 10-13m EW6149.24 ? Equivalent width of Fe II 6149.24 (mÅ) 54- 55 I2 10-13m EW6247.56 ? Equivalent width of Fe II 6247.56 (mÅ)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. 2000 identifier (G1) 7- 9 A3 --- EW6300.31 [syn] determined via spectrum synthesis instead of equivalent width measurements 11- 13 I3 10-13m EW6154.23 ? Equivalent width of Na I 6154.23 (mÅ) 15- 17 I3 10-13m EW6160.75 ? Equivalent width of Na I 6160.75 (mÅ) 19- 21 A3 --- EW6696.03 [syn] determined via spectrum synthesis instead of equivalent width measurements 23- 25 A3 --- EW6698.67 [syn] determined via spectrum synthesis instead of equivalent width measurements 27- 29 I3 10-13m EW6155.13 ? Equivalent width of Si I 6155.13 (mÅ) 31- 32 I2 10-13m EW6237.32 ? Equivalent width of Si I 6237.32 (mÅ) 34- 36 I3 10-13m EW6161.29 ? Equivalent width of Ca I 6161.29 (mÅ) 38- 40 I3 10-13m EW6162.18 ? Equivalent width of Ca I 6162.18 (mÅ) 42- 44 I3 10-13m EW6166.44 ? Equivalent width of Ca I 6166.44 (mÅ) 46- 48 I3 10-13m EW6169.04 ? Equivalent width of Ca I 6169.04 (mÅ) 50- 52 I3 10-13m EW6169.56 ? Equivalent width of Ca I 6169.56 (mÅ) 54- 56 I3 10-13m EW6210.67 ? Equivalent width of Sc I 6210.67 (mÅ) 58- 60 I3 10-13m EW6305.66 ? Equivalent width of Sc I 6305.66 (mÅ)
Byte-by-byte Description of file: table4b.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) 7- 9 I3 10-13m EW6245.62 ? Equivalent width of Sc II 6245.62 (mÅ) 11- 12 I2 10-13m EW6309.88 ? Equivalent width of Sc II 6309.88 (mÅ) 14- 15 I2 10-13m EW6146.23 ? Equivalent width of Ti I 6146.23 (mÅ) 17- 19 I3 10-13m EW6258.11 ? Equivalent width of Ti I 6258.11 (mÅ) 21- 23 I3 10-13m EW6261.10 ? Equivalent width of Ti I 6261.10 (mÅ) 25- 27 I3 10-13m EW6303.76 ? Equivalent width of Ti I 6303.76 (mÅ) 29- 31 I3 10-13m EW6312.24 ? Equivalent width of Ti I 6312.24 (mÅ) 33- 35 I3 10-13m EW6336.11 ? Equivalent width of Ti I 6336.11 (mÅ) 37- 38 I2 10-13m EW6175.37 ? Equivalent width of Ni I 6175.37 (mÅ) 40- 41 I2 10-13m EW6176.81 ? Equivalent width of Ni I 6176.81 (mÅ) 43- 44 I2 10-13m EW6177.25 ? Equivalent width of Ni I 6177.25 (mÅ) 46- 47 I2 10-13m EW6186.71 ? Equivalent width of Ni I 6186.71 (mÅ) 49- 51 I3 10-13m EW6327.60 ? Equivalent width of Ni I 6327.60 (mÅ) 53- 55 A3 --- EW6262.29 [syn] determined via spectrum synthesis instead of equivalent width measurements 57- 58 I2 10-13m EW6645.06 ? Equivalent width of Eu II 6645.06 (mÅ)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) 7- 10 I4 --- ROA ? Woolley (1966ROAn....2....1W) identifier (<NGC 5139 NNNN> for Simbad) 12- 16 F5.2 [Sun] [FeI/H] The [FeI/H] number abundance 18- 22 F5.2 [Sun] [FeII/H] ? The [FeII/H] number abundance 24- 28 F5.2 [Sun] <[Fe/H]> Averaged [Fe/H] number abundance 30- 34 F5.2 [Sun] [O/Fe] ? The [O/Fe] number abundance 36- 40 F5.2 [Sun] [Na/Fe] ? The [Na/Fe] number abundance 42- 46 F5.2 [Sun] [Al/Fe] ? The [Al/Fe] number abundance 48- 52 F5.2 [Sun] [Si/Fe] ? The [Si/Fe] number abundance 54- 58 F5.2 [Sun] [Ca/Fe] ? The [Ca/Fe] number abundance 60- 64 F5.2 [Sun] [ScI/Fe] ? The [ScI/Fe] number abundance 66- 70 F5.2 [Sun] [ScII/Fe] ? The [ScII/Fe] number abundance 72- 76 F5.2 [Sun] [Sc/Fe] ? Averaged [Sc/Fe] number abundance 78- 82 F5.2 [Sun] [Ti/Fe] ? The [Ti/Fe] number abundance 84- 88 F5.2 [Sun] [Ni/Fe] ? The [Ni/Fe] number abundance 89 A1 --- u_[Ni/Fe] Uncertainty flag on [Ni/Fe] 91- 95 F5.2 [Sun] [LaII/Fe] ? The [LaII/Fe] number abundance 97-101 F5.2 [Sun] [EuII/Fe] ? The [EuII/Fe] number abundance 103-105 A3 --- Code Abundance code (2)
Note (2): Code as follows: 1 = [O/Fe] upper limit; 2 = [Na/Fe] upper limit; 3 = [Al/Fe] upper limit; 4 = [La/Fe] upper limit.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) 7- 8 I2 --- NFeI Number of FeI lines measured 10- 13 F4.2 --- sigFeI The FeI σ/N-FeI1/2 value 15 I1 --- NFeII ? Number of FeII lines measured 17- 20 F4.2 --- sigFeII ? The FeII σ/N-FeI1/2 value 22 I1 --- NNa ? Number of Na lines measured 24- 27 F4.2 --- sigNa ? The Na σ/N-Na1/2 value 29 I1 --- NAl ? Number of Al lines measured 31- 34 F4.2 --- sigAl ? The Al σ/N-Al1/2 value 36 I1 --- NSi ? Number of Si lines measured 38- 41 F4.2 --- sigSi ? The Si σ/N-Si1/2 value
Byte-by-byte Description of file: table6b.dat
Bytes Format Units Label Explanations
1- 5 I5 --- LEID Van Leeuwen et al. identifier (G1) 7 I1 --- NCa ? Number of Ca lines measured 9- 12 F4.2 --- sigCa ? The Ca σ/N-FeI1/2 value 14 I1 --- NScI ? Number of ScI lines measured 16- 19 F4.2 --- sigScI ? The ScI σ/N-FeI1/2 value 21 I1 --- NScII ? Number of Sc IIlines measured 23- 26 F4.2 --- sigScII ? The ScII σ/N-FeI1/2 value 28 I1 --- NTi ? Number of Tilines measured 30- 33 F4.2 --- sigTi ? The Ti σ/N-FeI1/2 value 35 I1 --- NNi ? Number of Ni lines measured 37- 40 F4.2 --- sigNi ? The Ni σ/N-FeI1/2 value
Byte-by-byte Description of file: ion.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Ion Ion identification 6- 12 F7.2 0.1nm lambda Wavelength (in Angstroms) 14- 17 F4.2 eV EP Excitation potential 19- 23 F5.2 [-] log(gf) Log of the oscillator strength 25- 28 F4.2 [-] eps Abundance of element in Sun [εSun = log(Ion/H)+12]
Global Notes: Note (G1): Photometry, coordinates, and membership probabilities for all stars were taken from the proper motion study by van Leeuwen et al. (2000, Cat. J/A+A/360/472; <Cl* NGC 5139 Leid NNNNN> for Simbad).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Jul-2012
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