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. =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 {alpha}-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 6800{AA} 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 T_eff_ 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 ~5800{AA}. -------------------------------------------------------------------------------- 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 {xi} 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