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J/ApJ/681/1505      Abundances of red giants in ω Cen     (Johnson+, 2008)

Fe and Al abundances for 180 red giants in the globular cluster omega Centauri (NGC 5139). Johnson C.I., Pilachowski C.A., Simmerer J., Schwenk D. <Astrophys. J., 681, 1505-1523 (2008)> =2008ApJ...681.1505J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Abundances, [Fe/H] ; Radial velocities ; Clusters, globular ; Equivalent widths ; Photometry ; Spectroscopy Keywords: globular clusters: general - stars: abundances - stars: Population II globular clusters: individual (ω Centauri, NGC 5139) Abstract: We present radial velocities and Fe and Al abundances for 180 red giant branch (RGB) stars in the Galactic globular cluster Omega Centauri (ω Cen). The majority of our data lie in the range 11.0<V<13.5, which covers the RGB from about 1mag above the horizontal branch to the RGB tip. The selection procedures are biased toward preferentially observing the more metal-poor and luminous stars of ω Cen. Abundances were determined using equivalent width measurements and spectrum synthesis analyses of moderate resolution spectra (R∼13000) obtained with the Blanco 4m telescope and Hydra multifiber spectrograph. Our results are in agreement with previous studies as we find at least four different metallicity populations with [Fe/H]=-1.75, -1.45, -1.05, and -0.75, with a full range of -2.20≲[Fe/H]≲-0.70. Results seem to fit in the adopted scheme that star formation occurred in ω Cen over >1Gyr. Description: The observations of all 180 giants in ω Cen were obtained with the Blanco 4m telescope using the Hydra multifiber positioner and bench spectrograph at the Cerro Tololo Inter-American Observatory, in UT 2003 July 17, 18 and 19. Spectra include the region from 6500-6750Å. Target stars, coordinates, photometry, and membership probability were taken from the proper motion study by van Leeuwen et al. (2000, Cat. J/A+A/360/472). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 26 45.9 -47 28 37 omega Centauri = NGC 5139 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 28 180 *Radial velocity and membership information table3.dat 57 180 Photometry and model atmosphere parameters table4.dat 24 23 Line list table5.dat 89 180 Equivalent widths table6.dat 41 180 Derived abundances
Note on table2.dat : The cluster mean radial velocity, error and 1σ values are given here: --------------------- HRV e_HRV Sigma --------------------- 231.8 1.6 0.8 232.0 1.5 0.6 11.7 0.3 0.6 ---------------------
See also: J/ApJS/99/637 : Equivalent widths for 54 red giants (Norris+ 1995) J/ApJ/462/241 : Ca abundance for Omega Cen red giants (Norris+ 1996) J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000) J/A+A/445/503 : Radial velocities in Omega Cen (NGC5139) (Reijns+, 2006) J/ApJ/647/1075 : Age-metallicity relation of ω Cen (Stanford+, 2006) J/ApJ/661/L155 : Radial velocities Rgb stars in omega Cen (Pancino+, 2007) J/MNRAS/396/2183 : Radial velocities of red giants in ω Cen (Sollima+, 2009) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Star Van Leeuwen et al. (2000, Cat. J/A+A/360/472) identification (G1) 7- 10 I4 --- OName ? Woolley (1966ROAn....2....1W) identification number (G2) 12- 16 F5.1 km/s HRV Heliocentric radial velocity 18- 20 F3.1 km/s e_HRV Error in HRV 22- 24 F3.1 --- sigma The 1σ deviation from mean 26- 28 I3 % Mm ? van Leeuwen et al. (2000, Cat. J/A+A/360/472) membership probability
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Star Van Leeuwen et al. (2000, Cat. J/A+A/360/472) identification (G1) 7- 10 I4 --- OName ? Woolley (1966ROAn....2....1W) identification number (G2) 12- 17 F6.3 mag Vmag van Leeuwen et al. (2000, Cat. J/A+A/360/472) V band magnitude 19- 23 F5.3 mag B-V The (B-V) color index 25- 29 F5.3 mag V-K The (V-Ks) color index (1) 31- 36 F6.3 mag VMAG Extinction corrected absolute V band magnitude 38- 41 I4 K Teff Effective temperature 43- 46 F4.2 [cm/s2] log(g) Log of surface gravity 48- 52 F5.2 [Sun] [Fe/H] Metallicity 54- 57 F4.2 km/s Vturb Microturbulent velocity
Note (1): Transformed to the Carlos Sanchez Telescope (TCS) photometric system.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Element name 7- 13 F7.2 0.1nm Wave Wavelength in Angstroms 15- 18 F4.2 eV ExPot Excitation Potential 20- 24 F5.2 [-] log(gf) Log of oscillator strength
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Star Van Leeuwen et al. (2000, Cat. J/A+A/360/472) identification (G1) 7- 8 I2 0.1pm W6516 ? Equivalent width at 6516 Angstroms (1) 10- 11 I2 0.1pm W6533 ? Equivalent width at 6533 Angstroms (1) 13- 15 I3 0.1pm W6546 ? Equivalent width at 6546 Angstroms (1) 17- 19 I3 0.1pm W6551 ? Equivalent width at 6551 Angstroms (1) 21- 23 I3 0.1pm W6574 ? Equivalent width at 6574 Angstroms (1) 25- 27 I3 0.1pm W6592 Equivalent width at 6592 Angstroms (1) 29- 31 I3 0.1pm W6593 ? Equivalent width at 6593 Angstroms (1) 33- 34 I2 0.1pm W6597 ? Equivalent width at 6597 Angstroms (1) 36- 38 I3 0.1pm W6608 ? Equivalent width at 6608 Angstroms (1) 40- 42 I3 0.1pm W6609 ? Equivalent width at 6609 Angstroms (1) 44- 46 I3 0.1pm W6625 ? Equivalent width at 6625 Angstroms (1) 48- 49 I2 0.1pm W6627 ? Equivalent width at 6627 Angstroms (1) 51- 52 I2 0.1pm W6633 ? Equivalent width at 6633 Angstroms (1) 54- 55 I2 0.1pm W6646 ? Equivalent width at 6646 Angstroms (1) 57- 59 I3 0.1pm W6648 ? Equivalent width at 6648 Angstroms (1) 61- 63 I3 0.1pm W6677 ? Equivalent width at 6677 Angstroms (1) 65- 66 I2 0.1pm W6696 ? Equivalent width at 6696 Angstroms (1) 67 A1 --- f_W6696 [S] Flag on W6696 (2) 69- 70 I2 0.1pm W6698 ? Equivalent width at 6698 Angstroms (1) 71 A1 --- f_W6698 [S] Flag on W6698 (2) 73- 75 I3 0.1pm W6703 ? Equivalent width at 6703 Angstroms (1) 77- 79 I3 0.1pm W6710 ? Equivalent width at 6710 Angstroms (1) 81- 82 I2 0.1pm W6726 ? Equivalent width at 6726 Angstroms (1) 84- 85 I2 0.1pm W6733 ? Equivalent width at 6733 Angstroms (1) 87- 89 I3 0.1pm W6739 ? Equivalent width at 6739 Angstroms (1)
Note (1): In units of milli-Angstroms (mÅ=0.1pm) Note (2): 'S' indicates a synthetic spectrum comparison method was used.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Star Van Leeuwen et al. (2000, Cat. J/A+A/360/472) identification (G1) 7- 10 F4.2 [-] logFe Log of Fe number epsilon abundance (1) 12- 16 F5.2 [Sun] [Fe/H] Log of Fe/H number abundance relative to solar (2) 18- 19 I2 --- o_[Fe/H] Number of lines used to derive [Fe/H] 21- 24 F4.2 [Sun] e_[Fe/H] The σ/N0.5 deviation of [Fe/H] 26- 29 F4.2 [-] logAl ? Log of Al number abundance (1) 31- 34 F4.2 [Sun] [Al/H] ? Log of Al/H number abundance relative to solar (3) 36 I1 --- o_[Al/H] ? Number of lines used to derive [Al/H] 38- 41 F4.2 [Sun] e_[Al/H] ? The σ/N0.5 deviation of [Al/H]
Note (1): Where log(H)=12 Note (2): Assumed the solar logε(Fe)=7.52 (Sneden et al., 1991AJ....102.2001S). Note (3): Assumed the solar logε(Al)=6.47 (Anders & Grevesse, 1989GeCoA..53..197A).
Global notes: Note (G1): Objects are designated by <Cl* NGC 5139 Leid NNNNN> in Simbad. Note (G2): Objects are <NGC 5139 NNNN> in Simbad.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 03-Nov-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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