J/A+A/528/A92 HERES VI. Galactic chemical evolution of Si and C (Zhang+, 2011)
The Hamburg/ESO R-process Enhanced Star survey (HERES).
VI. The Galactic chemical evolution of silicon.
Zhang L., Karlsson T., Christlieb N., Korn A.J., Barklem P.S., Zhao G.
<Astron. Astrophys., 528, A92 (2011)>
=2011A&A...528A..92Z 2011A&A...528A..92Z
ADC_Keywords: Stars, nearby ; Abundances
Keywords: line: formation - line: profiles - stars: abundances -
stars: Population III - Galaxy: abundances - Galaxy: halo
Abstract:
To obtain detailed silicon abundances of metal-poor stars, we aim to
explore the correlation between the abundance ratios and the stellar
parameters and the chemical enrichment of the interstellar medium
(ISM).
We determined the silicon abundances of 253 metal-poor stars in the
metallicity range -4<[Fe/H]←1.5, based on non-local thermodynamic
equilibrium (NLTE) line formation calculations of neutral silicon and
high-resolution spectra obtained with VLT-UT2/UVES.
Description:
The present work is based on the spectra of 253 HERES stars. The
sample selection and observations are described in Christlieb et al.
(2004A&A...428.1027C 2004A&A...428.1027C). For the convenience of the reader, we repeat
here that the spectra were obtained with the Ultraviolet-Visual
Echelle Spectrograph (UVES) mounted on the 8m Unit Telescope 2
(Kueyen) of the Very Large Telescope (VLT).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 118 253 Abundance results of carbon and silicon
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See also:
J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)
J/A+A/516/A46 : HE 2327-5642 abundance analysis (Mashonkina+, 2010)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Star Star name
15- 19 F5.2 [Sun] [Fe/H] Metallicity
21- 24 F4.2 [-] eps(C) Carbon abundance (1)
26- 30 F5.2 [Sun] [C/H] Abundance ratio [C/H]
32- 35 F4.2 [Sun] e_[C/H] rms uncertainty on [C/H]
37- 41 F5.2 [Sun] [C/Fe] Abundance ratio [C/Fe]
43- 46 F4.2 [Sun] e_[C/Fe] rms uncertainty on [C/Fe]
48 A1 --- l_eps(Si1) Limit flag on epsSi1
49- 52 F4.2 [-] eps(Si1) Si 3905Å NLTE abundance (1)
54 A1 --- l_eps(Si2) Limit flag on epsSi2
55- 58 F4.2 [-] eps(Si2) Si 4103Å NLTE abundance (1)
60 A1 --- l_[Si/H]1 Limit flag on [Si/H]1
61- 65 F5.2 [Sun] [Si/H]1 NLTE abundance ratio [Si/H] for Si3905
67- 70 F4.2 [Sun] e_[Si/H]1 rms uncertainty on [Si/H]1
72 A1 --- l_[Si/H]2 Limit flag on [Si/H]2
73- 77 F5.2 [Sun] [Si/H]2 NLTE abundance ratio [Si/H] for Si4103
79- 82 F4.2 [Sun] e_[Si/H]2 rms uncertainty on [Si/H]2
84 A1 --- l_[Si/Fe]1 Limit flag on [Si/Fe]1
85- 89 F5.2 [Sun] [Si/Fe]1 NLTE abundance ratio [Si/Fe] for Si3905
91- 94 F4.2 [Sun] e_[Si/Fe]1 rms uncertainty on [Si/Fe]1
96 A1 --- l_[Si/Fe]2 Limit flag on [Si/Fe]2
97-101 F5.2 [Sun] [Si/Fe]2 NLTE abundance ratio [Si/Fe] for Si4103
103-106 F4.2 [Sun] e_[Si/Fe]2 rms uncertainty on [Si/Fe]2
108 A1 --- l_[Si/Fe] Limit flag on [Si/Fe]
109-113 F5.2 [Sun] [Si/Fe] Abundance ratio [Si/Fe]
115-118 F4.2 [Sun] e_[Si/Fe] rms uncertainty on [Si/Fe]
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Note (1): abundances ε(E) = 12+log(N(E)/N(H)) for the element E.
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History:
From electronic version of the journal
References:
Christlieb et al., Paper I 2004A&A...428.1027C 2004A&A...428.1027C
Barklem et al., Paper II 2005A&A...439..129B 2005A&A...439..129B, Cat. J/A+A/439/129
Jonsell et al., Paper III 2006A&A...451..651J 2006A&A...451..651J
Hayek et al., Paper IV 2009A&A...504..511H 2009A&A...504..511H
Mashonkina et al., Paper V 2010A&A...516A..46M 2010A&A...516A..46M, Cat. J/A+A/516/A46
(End) Patricia Vannier [CDS] 18-Aug-2011