J/ApJ/771/67 Detailed abundances for 97 metal-poor stars. II. (Ishigaki+, 2013)
Chemical abundances of the Milky Way thick disk and stellar halo.
II. Sodium, iron-peak, and neutron-capture elements.
Ishigaki M.N., Aoki W., Chiba M.
<Astrophys. J., 771, 67 (2013)>
=2013ApJ...771...67I 2013ApJ...771...67I
ADC_Keywords: Abundances ; Stars, nearby ; Stars, halo ; Milky Way ;
Equivalent widths
Keywords: Galaxy: formation; Galaxy: halo; stars: abundances
Abstract:
We present chemical abundance analyses of sodium, iron-peak, and
neutron-capture elements for 97 kinematically selected thick disk,
inner halo, and outer halo stars with metallicities -3.3<[Fe/H]←0.5.
The main aim of this study is to examine chemical similarities and
differences among metal-poor stars belonging to these old Galactic
components as a clue to determine their early chemodynamical
evolution. In our previous paper, we obtained abundances of α
elements by performing a one-dimensional LTE abundance analysis based
on the high-resolution (R∼50000) spectra obtained with the Subaru/HDS.
In this paper, a similar analysis is performed to determine abundances
of an additional 17 elements. We show that, in metallicities below
[Fe/H]~-2, the abundance ratios of many elements in the thick disk,
inner halo, and outer halo subsamples are largely similar. In
contrast, in higher metallicities ([Fe/H]≳-1.5), differences in some
of the abundance ratios among the three subsamples are identified.
Specifically, the [Na/Fe], [Ni/Fe], [Cu/Fe], and [Zn/Fe] ratios in the
inner and outer halo subsamples are found to be lower than those in
the thick disk subsample.
Description:
The observations for all of the sample stars were made with the High
Dispersion Spectrograph (HDS) mounted on the Subaru telescope during
2003-2010. The wavelength range of ∼4000-6800Å was covered with a
spectral resolution of R∼50000 for most of the sample stars, while the
several sample stars (G 64-12, G 64-37, BD+13 2995, G 14-39, and
G 20-15) were observed with R∼90000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 4001 Equivalent widths
table2.dat 265 97 Atmospheric parameters and abundances
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See also:
J/ApJ/753/64 : Pap. I: abundances for 97 metal-poor stars (Ishigaki+, 2012)
J/ApJ/749/77 : MW halo. III. Statistical abundances (Schlaufman+, 2012)
J/ApJ/737/9 : RAVE data of stars in the thick disk (Ruchti+, 2011)
J/A+A/530/A15 : Abundances of 94 stars (Nissen+, 2011)
J/ApJ/714/663 : Stellar density map of the Milky Way (de Jong+, 2010)
J/ApJ/711/573 : Abundances in a halo stellar stream (Roederer+, 2010)
J/A+A/513/A35 : Abundances of Galactic red giants (Alves-Brito+, 2010)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/A+A/512/A41 : Abundances of microlensed stars in the Bulge (Bensby+, 2010)
J/A+A/511/L10 : Abundances and space velocities of 94 stars (Nissen+, 2010)
J/A+A/501/519 : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)
J/ApJ/706/1095 : Chemical compositions of 26 outer halo stars (Zhang+, 2009)
J/ApJ/703/2177 : Metal-poor MS turnoff stars summary (Schlaufman+, 2009)
J/AJ/137/272 : Space velocities orbits in the MW halo (Roederer+ 2009)
J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)
J/AJ/134/1579 : Halo stars in solar neighborhood (Kepley+, 2007)
J/ApJ/645/613 : Abundances of HD 221170 (Ivans+, 2006)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/A+A/433/185 : Abundance analysis of 102 F and G dwarfs (Bensby+, 2005)
J/AZh/81/209 : Neutron capture elements in stars (Mashonkina+, 2004)
J/ApJ/617/1091 : La and Eu abundances in 85 stars (Simmerer+, 2004)
J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)
J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)
J/AJ/119/2866 : Proper motions of metal-poor stars (Beers+, 2000)
J/A+A/287/927 : Abundances for lines of n-capture in stars (Gratton+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 --- Z [11/60] Atomic number
15 I1 --- Ion [1/2] State of ionization
17- 20 A4 --- Elem Name of the element
22- 28 F7.2 0.1nm lambda [4030.7/6771] Line wavelength (Å)
30- 34 F5.2 [-] loggf [-3.5/0.6] Log of the oscillator strength
36- 39 F4.2 eV ExPot [0/4.1] Excitation potential
41- 46 F6.2 10-13m EW [-0.5/198] Line equivalent width (mÅ)
48 I1 --- f_EW [0/1] Line used for abundance: 1=yes, 0=no
50- 53 A4 --- r_EW Reference on log(gf) (1)
55- 57 A3 --- hfs "hfs" if hyper-fine splitting is taken
into account
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Note (1): Reference as follows:
B07 = Blackwell-Whitehead, R. and Bergemann, M. 2007A&A...472L..43B 2007A&A...472L..43B
I06 = Ivans et al. 2006, Cat. J/ApJ/645/613
NIST = Ralchenko, Yu., Kramida, A.E., Reader, J., and NIST ASD
Team (2008). NIST Atomic Spectra Database (version 3.1.5), [Online].
Available: http://physics.nist.gov/asd3 [2010, July 8].
National Institute of Standards and Technology, Gaithersburg, MD
NS10 = Nissen, P. E. & Schuster, W. J. 2010, Cat. J/A+A/511/L10
R10 = Roederer et al. 2010, J/ApJ/711/573
S07 = Sobeck, J. S., Lawler, J. E., & Sneden, C., 2007, Cat. J/ApJ/667/1267
SB02 = Stephens, A. & Boesgaard, A. M. 2002AJ....123.1647S 2002AJ....123.1647S
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 15 I4 K Teff [4048/6881] Effective temperature
17- 20 F4.2 [cm/s2] log(g) [0.4/5] Log surface gravity
22- 25 F4.2 km/s Vt [0.04/2.5] Micro-turbulence velocity
27- 31 F5.2 [Sun] [FeI/H] [-3.3/-0.5] Log of Fe I/H abundance
33- 36 F4.2 [Sun] e_[FeI/H] Uncertainty in [FeII/H]
38- 42 F5.2 [Sun] [FeII/H] Log of Fe II/H abundance
44- 47 F4.2 [Sun] e_[FeII/H] Uncertainty in [FeII/H]
49- 53 F5.2 [Sun] [Na/Fe] ?=-9.99 Log of Na/Fe abundance
55- 58 F4.2 [Sun] e_[Na/Fe] ?=0 Uncertainty in [Na/Fe]
60- 64 F5.2 [Sun] [Sc/Fe] Log of Sc/Fe abundance
66- 69 F4.2 [Sun] e_[Sc/Fe] Uncertainty in [Sc/Fe]
71- 75 F5.2 [Sun] [V/Fe] ?=-9.99 Log of V/Fe abundance
77- 80 F4.2 [Sun] e_[V/Fe] ?=0 Uncertainty in [V/Fe]
82- 86 F5.2 [Sun] [CrI/Fe] ?=-9.99 Log of Cr I/Fe abundance
88- 91 F4.2 [Sun] e_[CrI/Fe] ?=0 Uncertainty in [CrI/Fe]
93- 97 F5.2 [Sun] [CrII/Fe] ?=-9.99 Log of Cr II/Fe abundance
99-102 F4.2 [Sun] e_[CrII/Fe] ?=0 Uncertainty in [CrII/Fe]
104-108 F5.2 [Sun] [Mn/Fe] ?=-9.99 Log of Mn/Fe abundance
110-113 F4.2 [Sun] e_[Mn/Fe] ?=0 Uncertainty in [Mn/Fe]
115-119 F5.2 [Sun] [Co/Fe] ?=-9.99 Log of Co/Fe abundance
121-124 F4.2 [Sun] e_[Co/Fe] ?=0 Uncertainty in [Co/Fe]
126-130 F5.2 [Sun] [Ni/Fe] ?=-9.99 Log of Ni/Fe abundance
132-135 F4.2 [Sun] e_[Ni/Fe] ?=0 Uncertainty in [Ni/Fe]
137 A1 --- l_[Cu/Fe] Limit flag on Cu/Fe abundance
138-142 F5.2 [Sun] [Cu/Fe] ?=-9.99 Log of Cu/Fe abundance
144-147 F4.2 [Sun] e_[Cu/Fe] ?=0 Uncertainty in [Cu/Fe]
149-153 F5.2 [Sun] [Zn/Fe] ?=-9.99 Log of Zn/Fe abundance
155-158 F4.2 [Sun] e_[Zn/Fe] ?=0 Uncertainty in [Zn/Fe]
160-164 F5.2 [Sun] [Sr/Fe] ?=-9.99 Log of Sr/Fe abundance
166-169 F4.2 [Sun] e_[Sr/Fe] ?=0 Uncertainty in [Sr/Fe]
171-175 F5.2 [Sun] [Y/Fe] ?=-9.99 Log of Y/Fe abundance
177-180 F4.2 [Sun] e_[Y/Fe] ?=0 Uncertainty in [Y/Fe]
182-186 F5.2 [Sun] [Zr/Fe] ?=-9.99 Log of Zr/Fe abundance
188-191 F4.2 [Sun] e_[Zr/Fe] ?=0 Uncertainty in [Zr/Fe]
193-197 F5.2 [Sun] [Ba/Fe] ?=-9.99 Log of Ba/Fe abundance
199-202 F4.2 [Sun] e_[Ba/Fe] ?=0 Uncertainty in [Ba/Fe]
204-208 F5.2 [Sun] [La/Fe] ?=-9.99 Log of La/Fe abundance
210-213 F4.2 [Sun] e_[La/Fe] ?=0 Uncertainty in [La/Fe]
215-219 F5.2 [Sun] [Nd/Fe] ?=-9.99 Log of Nd/Fe abundance
221-224 F4.2 [Sun] e_[Nd/Fe] ?=0 Uncertainty in [Nd/Fe]
226-230 F5.2 [Sun] [Sm/Fe] ?=-9.99 Log of Sm/Fe abundance
232-235 F4.2 [Sun] e_[Sm/Fe] ?=0 Uncertainty in [Sm/Fe]
237 A1 --- l_[Eu/Fe] Limit flag on Eu/Fe abundance
238-242 F5.2 [Sun] [Eu/Fe] ?=-9.99 Log of Eu/Fe abundance
244-247 F4.2 [Sun] e_[Eu/Fe] ?=0 Uncertainty in [Eu/Fe]
249-253 F5.3 --- Ptd [0/1] Membership probability for thick disk
255-259 F5.3 --- Pih [0/1] Membership probability for inner halo
261-265 F5.3 --- Poh [0/1] Membership probability for outer halo
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History:
From electronic version of the journal
References:
Ishigaki et al. Paper I. 2012ApJ...753...64I 2012ApJ...753...64I Cat. J/ApJ/753/64
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Jan-2015