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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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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 1991AJ....101.1865R).
Note (2): The signal-to-noise ratio and number of photon per unit pixel
evaluated at ∼5800Å.
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Byte-by-byte Description of file: ew.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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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]
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Byte-by-byte Description of file: table14.dat
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Bytes Format Units Label Explanations
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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]
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Dec-2011