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J/ApJ/706/1095      Chemical compositions of 26 outer halo stars  (Zhang+, 2009)

Chemical compositions of kinematically selected outer halo stars. Zhang L., Ishigaki M., Aoki W., Zhao G., Chiba M. <Astrophys. J., 706, 1095-1113 (2009)> =2009ApJ...706.1095Z
ADC_Keywords: Abundances ; Abundances, [Fe/H] ; Equivalent widths ; Spectroscopy Stars, dwarfs ; Stars, giant ; Stars, halo ; Galactic plane Keywords: Galaxy: abundances - Galaxy: evolution - Galaxy: halo - stars: abundances Abstract: Chemical abundances of 26 metal-poor dwarfs and giants are determined from high-resolution and high signal-to-noise ratio spectra obtained with the Subaru/High Dispersion Spectrograph. The sample is selected so that most of the objects have outer-halo kinematics. Self-consistent atmospheric parameters were determined by an iterative procedure based on spectroscopic analysis. Abundances of 13 elements, including α-elements (Mg, Si, Ca, Ti), odd-Z light elements (Na, Sc), iron-peak elements (Cr, Mn, Fe, Ni, Zn), and neutron-capture elements (Y, Ba), are determined by two independent data reduction and local thermodynamic equillibrium analysis procedures, confirming the consistency of the stellar parameters and abundances results. Description: We obtained high-resolution spectra of our targets using the Subaru Telescope High Dispersion Spectrograph (HDS) in 2003 February. Table 1 lists the objects and details of the observations. The spectra cover the wavelength range from 4100 to 6800Å with a resolving power of 50000. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 26 Log of the Subaru/HDS ew.dat 45 7514 Atomic data and measured equivalent widths table3.dat 46 26 Teff derived by different methods table4.dat 51 26 Derived atmospheric parameters for the sample stars table10.dat 76 26 Abundance ratios: Na, Mg, Si, and Ca table11.dat 92 26 Abundance ratios: Sc, Ti, Cr, and Mn table12.dat 91 26 Abundance ratios: Fe, Ni, Zn, Y, and Ba table13.dat 83 26 Abundance relative to Fe: Na, Mg, Si, Ca, Sc, and Ti table14.dat 87 26 Abundance relative to Fe: Cr, Mn, Ni, Zn, Y, and Ba
See also: B/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007) V/65 : Spectroscopically Selected Halo K Giants (Ratnatunga+ 1989) J/A+A/493/601 : Lithium abundances of halo dwarfs (Hosford+, 2009) J/AZh/84/997 : Abundances of Sr, Y, Zr, Ce and Ba (Mashonkina+, 2007) J/A+A/442/961 : Lithium content of the Galactic Halo stars (Charbonnel+, 2005) J/A+A/415/993 : FeII, ZNI and SI abundances on halo stars (Nissen+, 2004) J/A+A/403/1105 : Extremely metal-poor giants equivalent widths (Francois+, 2003) J/AJ/125/2502 : Spectral indices of Galactic halo (Morrison+, 2003) J/AJ/126/1362 : Century Survey Galactic Halo Project. I. (Brown+, 2003) J/AJ/120/1841 : Abundances and Kinematics of Halo and Disk Stars (Fulbright 2000) J/AJ/117/2329 : Spectroscopy of hot stars in the halo. III (Wilhelm+, 1999) J/A+A/326/751 : Chemical composition of halo and disk stars (Nissen+, 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Running sequence number 4- 13 A10 --- Name Star name 15- 16 I2 h RAh Hour of right ascension (J2000) 18- 19 I2 min RAm Minute of right ascension (J2000) 21- 25 F5.2 s RAs Second of right ascension (J2000) 27 A1 --- DE- Sign of declination (J2000) 28- 29 I2 deg DEd Degree of declination (J2000) 31- 32 I2 arcmin DEm Arcminute of declination (J2000) 34- 37 F4.1 arcsec DEs Arcsecond of declination (J2000) 39- 43 F5.2 mag Vmag V-band magnitude from litterature (1) 45- 49 F5.2 [Sun] [Fe/H]l Metallicity from litterature (1) 51- 54 I4 s Exp Exposure time 56- 61 I6 --- Nph S/N ratio and photon number (2) 63- 68 F6.1 km/s HRV Heliocentric radial velocity 70- 74 F5.2 kpc Rapo The maximum radial distances from the Galactic center 76- 80 F5.2 kpc Zmax The maximum distance of the orbit above and below the Galactic plane
Note (1): V-band magnitude and metallicity are taken from Beers et al. (2000 Cat. J/AJ/119/2866), Carney et al. (1994, Cat. J/AJ/107/2240), or Ryan & Norris (1991AJ....101.1865R). Note (2): The signal-to-noise ratio and number of photon per unit pixel evaluated at ∼5800Å.
Byte-by-byte Description of file: ew.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 15 A4 --- ID Element ionization identification 17- 24 F8.3 0.1nm lambda Wavelength 26- 29 F4.2 eV ExPot Excitation potential 31- 35 F5.2 [-] log(gf) Log in the oscillator strength 37- 39 F3.1 0.1nm D6 The van der Waals enhancement factor 41- 45 F5.1 0.1pm EW ? Equivalent width in units of milli-Angstroms
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.3 --- E(B-V) Color excess in (B-V) 18- 21 I4 K T(V-K) ? Effective temperature based on (V-K) 23- 26 I4 K T(J-H) ? Effective temperature based on (J-H) 28- 31 I4 K T(J-K) ? Effective temperature based on (J-K) 33- 36 I4 K Tci ? Average temperature based on color indices 38- 41 I4 K TSAII Effective temperature derived the independent analysis (SA II) 43- 46 I4 K Teff Effective temperature adopted in this work from a spectroscopic analysis (SA)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12 A1 --- T [GD] Type (G: giant or D: dwarf) 14- 17 I4 K Teff Effective temperature 19- 21 I3 K e_Teff Teff uncertainty 23- 26 F4.2 [cm/s2] logg Surface gravity 28- 31 F4.2 [cm/s2] e_logg logg uncertainty 33- 37 F5.2 [Sun] [Fe/H]d Derived metallicity 39- 42 F4.2 [Sun] e_[Fe/H]d Uncertainty in [Fe/H] 44- 47 F4.2 km/s xi Micro-turbulent velocity ξ 49- 51 F3.1 km/s e_xi xi uncertainty
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.2 [Sun] [NaI/H] Abundance of [NaI/H] 18- 21 F4.2 [Sun] e_[NaI/H] Uncertainty of [NaI/H] 23 I1 --- Nna Number of lines used 25- 29 F5.2 [Sun] [MgI/H] ? Abundance of [MgI/H] 31- 34 F4.2 [Sun] e_[MgI/H] ? Uncertainty of [MgI/H] 36 I1 --- Nmg ? Number of lines used 38- 42 F5.2 [Sun] [SiI/H] ? Abundance of [SiI/H] 44- 47 F4.2 [Sun] e_[SiI/H] ? Uncertainty of [SiI/H] 49 I1 --- Nsi1 ? Number of lines used 51- 55 F5.2 [Sun] [SiII/H] ? Abundance of [SiII/H] 57- 60 F4.2 [Sun] e_[SiII/H] ? Uncertainty of [SiII/H] 62 I1 --- Nsi2 ? Number of lines used 64- 68 F5.2 [Sun] [CaI/H] Abundance of [CaI/H] 70- 73 F4.2 [Sun] e_[CaI/H] Uncertainty of [CaI/H] 75- 76 I2 --- Nca Number of lines used
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.2 [Sun] [ScII/H] ? Abundance of [ScII/H] 18- 21 F4.2 [Sun] e_[ScII/H] ? Uncertainty of [ScII/H] 23- 24 I2 --- Nsc ? Number of lines used 26- 30 F5.2 [Sun] [TiI/H] ? Abundance of [TiI/H] 32- 35 F4.2 [Sun] e_[TiI/H] ? Uncertainty of [TiI/H] 37- 38 I2 --- Nti1 ? Number of lines used 40- 44 F5.2 [Sun] [TiII/H] Abundance of [TiII/H] 46- 49 F4.2 [Sun] e_[TiII/H] Uncertainty of [TiII/H] 51- 52 I2 --- Nti2 Number of lines used 54- 58 F5.2 [Sun] [CrI/H] ? Abundance of [CrI/H] 60- 63 F4.2 [Sun] e_[CrI/H] ? Uncertainty of [CrI/H] 65- 66 I2 --- Ncr1 ? Number of lines used 68- 72 F5.2 [Sun] [CrII/H] ? Abundance of [CrII/H] 74- 77 F4.2 [Sun] e_[CrII/H] ? Uncertainty of [CrII/H] 79 I1 --- Ncr2 ? Number of lines used 81- 85 F5.2 [Sun] [MnI/H] ? Abundance of [MnI/H] 87- 90 F4.2 [Sun] e_[MnI/H] ? Uncertainty of [MnI/H] 92 I1 --- Nmn ? Number of lines used
Byte-by-byte Description of file: table12.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.2 [Sun] [FeI/H] Abundance of [FeI/H] 18- 21 F4.2 [Sun] e_[FeI/H] Uncertainty of [FeI/H] 23- 24 I2 --- Nfe1 Number of lines used 26- 30 F5.2 [Sun] [FeII/H] Abundance of [FeII/H] 32- 35 F4.2 [Sun] e_[FeII/H] Uncertainty of [FeII/H] 37- 38 I2 --- Nfe2 Number of lines used 40- 44 F5.2 [Sun] [NiI/H] ? Abundance of [NiI/H] 46- 49 F4.2 [Sun] e_[NiI/H] ? Uncertainty of [NiI/H] 51- 52 I2 --- Nni ? Number of lines used 54- 58 F5.2 [Sun] [ZnI/H] ? Abundance of [ZnI/H] 60- 63 F4.2 [Sun] e_[ZnI/H] ? Uncertainty of [ZnI/H] 65 I1 --- Nzn ? Number of lines used 67- 71 F5.2 [Sun] [YII/H] ? Abundance of [YII/H] 73- 76 F4.2 [Sun] e_[YII/H] ? Uncertainty of [YII/H] 78 I1 --- Ny ? Number of lines used 80- 84 F5.2 [Sun] [BaII/H] ? Abundance of [BaII/H] 86- 89 F4.2 [Sun] e_[BaII/H] ? Uncertainty of [BaII/H] 91 I1 --- Nba ? Number of lines used
Byte-by-byte Description of file: table13.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.2 [Sun] [Fe/H] Abundance of [Fe/H] 18- 21 F4.2 [Sun] e_[Fe/H] Uncertainty of [Fe/H] 23- 27 F5.2 [Sun] [Na/Fe] Abundance of [Na/Fe] 29- 32 F4.2 [Sun] e_[Na/Fe] Uncertainty of [Na/Fe] 34- 37 F4.2 [Sun] [Mg/Fe] ? Abundance of [Mg/Fe] 39- 42 F4.2 [Sun] e_[Mg/Fe] ? Uncertainty of [Mg/Fe] 44- 47 F4.2 [Sun] [Si/Fe] ? Abundance of [Si/Fe] 49- 52 F4.2 [Sun] e_[Si/Fe] ? Uncertainty of [Si/Fe] 54- 57 F4.2 [Sun] [Ca/Fe] Abundance of [Ca/Fe] 59- 62 F4.2 [Sun] e_[Ca/Fe] Uncertainty of [Ca/Fe] 64- 68 F5.2 [Sun] [Sc/Fe] ? Abundance of [Sc/Fe] 70- 73 F4.2 [Sun] e_[Sc/Fe] ? Uncertainty of [Sc/Fe] 75- 78 F4.2 [Sun] [Ti/Fe] Abundance of [Ti/Fe] 80- 83 F4.2 [Sun] e_[Ti/Fe] Uncertainty of [Ti/Fe]
Byte-by-byte Description of file: table14.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 16 F5.2 [Sun] [Fe/H] Abundance of [Fe/H] 18- 21 F4.2 [Sun] e_[Fe/H] Uncertainty of [Fe/H] 23- 27 F5.2 [Sun] [Cr/Fe] ? Abundance of [Cr/Fe] 29- 32 F4.2 [Sun] e_[Cr/Fe] ? Uncertainty of [Cr/Fe] 34- 38 F5.2 [Sun] [Mn/Fe] ? Abundance of [Mn/Fe] 40- 43 F4.2 [Sun] e_[Mn/Fe] ? Uncertainty of [Mn/Fe] 45- 49 F5.2 [Sun] [Ni/Fe] ? Abundance of [Ni/Fe] 51- 54 F4.2 [Sun] e_[Ni/Fe] ? Uncertainty of [Ni/Fe] 56- 60 F5.2 [Sun] [Zn/Fe] ? Abundance of [Zn/Fe] 62- 65 F4.2 [Sun] e_[Zn/Fe] ? Uncertainty of [Zn/Fe] 67- 71 F5.2 [Sun] [Y/Fe] ? Abundance of [Y/Fe] 73- 76 F4.2 [Sun] e_[Y/Fe] ? Uncertainty of [Y/Fe] 78- 82 F5.2 [Sun] [Ba/Fe] ? Abundance of [Ba/Fe] 84- 87 F4.2 [Sun] e_[Ba/Fe] ? Uncertainty of [Ti/Fe]
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Dec-2011
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