J/A+A/442/961 Lithium content of the Galactic Halo stars (Charbonnel+, 2005)
The lithium content of the Galactic Halo stars.
Charbonnel C., Primas F.
<Astron. Astrophys., 442, 961-992 (2005)>
=2005A&A...442..961C 2005A&A...442..961C
ADC_Keywords: Stars, population II ; Abundances, peculiar
Keywords: stars: abundances - stars: Population II - stars: evolution -
Galaxy: abundances - Galaxy: halo - cosmology: early Universe
Abstract:
Thanks to the accurate determination of the baryon density of the
universe by the recent cosmic microwave background experiments,
updated predictions of the standard model of Big Bang nucleosynthesis
now yield the initial abundance of the primordial light elements with
unprecedented precision. In the case of 7Li, the CMB+SBBN value is
significantly higher than the generally reported abundances for Pop II
stars along the so-called Spite plateau. In view of the crucial
importance of this disagreement, which has cosmological, galactic and
stellar implications, we decided to tackle the most critical issues of
the problem by revisiting a large sample of literature Li data in halo
stars that we assembled following some strict selection criteria on
the quality of the original analyses.
We dissect our sample in search of new constraints on Li depletion in
halo stars. By means of the Hipparcos parallaxes, we derive the
evolutionary status of each of our sample stars, and re-discuss our
derived Li abundances.
Description:
The database of Li abundances measured in Galactic stars and available
in the literature is huge. During this work, we restricted our search
to the main observational analyses from the early 90 onwards.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 101 146 The data sample and its main characteristics,
as found in the literature
refs.dat 68 13 References
table6.dat 82 117 Final Li abundances as derived by using
different sets of Teff
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See also:
J/A+A/352/117 : Galactic lithium evolution revisited (Romano+, 1999)
J/AJ/105/2299 : Li abundance of solar-type stars. II. (Soderblom+, 1993)
J/A+A/363/239 : Lithium abundances in single giant stars (De Medeiros+, 2000)
J/A+A/371/943 : Lithium abundances for 185 main-sequence stars (Chen+, 2001)
J/A+A/409/251 : Li abundances and velocities in F and G stars (Mallik+, 2003)
J/MNRAS/349/757 : Masses, ages and metallicities of F-G dwarfs (Lambert+, 2004)
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP (I/239) number
8- 13 I6 --- HD ? HD number
15- 25 A11 --- BD/CD BD or CD designation
27- 33 A7 --- G Giclas number
35- 40 F6.3 mag Vmag V magnitude
42- 45 I4 K Teff ? Effective temperature
47- 50 I4 K Teff2 ? Second value of effective temperature
52- 55 F4.2 [cm/s2] logg ? Surface gravity
57- 60 F4.2 [cm/s2] logg2 ? Second value of surface gravity
62- 66 F5.2 [Sun] [Fe/H] Metallicity
68- 72 F5.2 [Sun] [Fe/H]2 ? Second value of metallicity
75 A1 --- l_EW Limit flag on EW
76- 79 F4.1 0.1pm EW ? Equivalent width of the LiI line (mÅ)
81 A1 --- l_EW2 Limit flag on EW2
82- 85 F4.1 0.1pm EW2 ? Second value of equivalent width
87-101 A15 --- Ref References detailed in file "ref.dat"
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 41 A18 --- Aut Author's name
46- 68 A23 --- Com Comments
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1 I1 --- Sample [1/3] Sample number (1)
3- 8 I6 --- HIP HIP (I/239) number
10 A1 --- Bin [*x?sv] Binarity flag (2)
12- 16 F5.2 [Sun] [Fe/H] Metallicity
18- 22 F5.3 [Sun] e_[Fe/H] rms uncertainty on [Fe/H]
24- 27 F4.2 [cm/s2] logg Surface gravity
29 A1 --- l_EW Limit flag on EW
30- 33 F4.1 0.1pm EW Equivalent width if the LiI line
34 A1 --- u_EW rms uncertainty on EW
36- 38 F3.1 0.1pm e_EW ?=- rms uncertainty on EW
40 A1 --- l_A(Li)LTE Limit flag on A(Li)LTE
41- 45 F5.3 [-] A(Li)LTE LTE Li abundance
46 A1 --- u_A(Li)LTE Uncertainty flag on A(Li)LTE
48 A1 --- l_A(Li)NLTE Limit flag on A(Li)NLTE
49- 53 F5.3 [-] A(Li)NLTE ?=- NLTE Li abundance
54 A1 --- u_A(Li)NLTE Uncertainty flag on A(Li)NLTE
56- 60 F5.3 [-] E_A(Li)LTE ?=- Error on A(Li)LTE and A(Li)NLTE
(upper limit)
62- 66 F5.3 [-] e_A(Li)LTE ?=- Error on A(Li)LTE and A(Li)NLTE
(lower limit)
68 A1 --- l_A(Li)S98 Limit flag on A(Li)S98
69- 73 F5.3 [-] A(Li)S98 Li abundance from Smith et al.,
1998ApJ...506..405S 1998ApJ...506..405S
74 A1 --- u_A(Li)S98 Uncertainty flag on A(Li)S98
76 A1 --- l_A(Li)H97 Limit flag on A(Li)H97
77- 81 F5.3 [-] A(Li)H97 ?=- Li abundance from Hobbs & Thorburn,
1997ApJ...491..772H 1997ApJ...491..772H
82 A1 --- u_A(Li)H97 Uncertainty flag on A(Li)H97
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Note (1): Samples as follows:
1 = the clean sample, made of 91 stars, for which the complete set
of Stroemgren photometric indices are available
2 = the β sample, 20 stars for which the reddening value E(b-y)
was derived from averaging different sources of E(B-V) values
3 = the ubvy sample, comprising 7 stars, for which one of the ubvy
photometric indices (b-y, c1, m1) falls just slightly outside
the allowed intervals for the application of the Schuster & Nissen
(1989A&A...221...65S 1989A&A...221...65S) calibrations
Note (2): Flags as follows:
? = Identifies a suspected binary
(Latham et al. 2002, Cat. J/AJ/124/1144;
Carney et al. 1994, Cat. J/AJ/107/2240, 2003AJ....125..293C 2003AJ....125..293C)
* = Identifies a confirmed single- or double-lined binary
(from Latham et al. 2002, Cat. J/AJ/124/1144;
Carney et al. 1994, Cat. J/AJ/107/2240, 2003AJ....125..293C 2003AJ....125..293C)
s = spectroscopic binary
v = variable star
x = high proper-motion star
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Aug-2006