2007A&A...465..587S


Query : 2007A&A...465..587S

2007A&A...465..587S - Astronomy and Astrophysics, volume 465, 587-591 (2007/4-2)

Lithium abundances in metal-poor stars.

SHI J.R., GEHREN T., ZHANG H.W., ZENG J.L. and ZHAO G.

Abstract (from CDS):

Lithium abundances for 19 metal-poor stars are determined using high-resolution spectroscopy. The abundances of stars on the lithium plateau are discussed. All abundance results are derived from NLTE statistical equilibrium calculations and spectrum synthesis methods. In agreement with previous analyses it is found that excitation and de-excitation due to hydrogen collisions are negligible for the lithium line formation process, while charge transfer reactions are an important source of thermalization. However, the resulting NLTE effects on the determination of lithium abundances for metal-poor stars are negligible (<0.06dex). The mean lithium abundance for stars on the lithium plateau determined from NLTE analyses is A(Li)∼2.26, while it is 2.21dex when charge transfer reactions are included. The latter result enhances the discrepancy between the observed lithium abundances and the primordial lithium abundance as inferred by the WMAP analysis of the cosmic microwave background. This discrepancy may be explained by metal diffusion.

Abstract Copyright:

Journal keyword(s): line: formation - line: profile - stars: abundance - stars: late-type - galaxies: evolution

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 19445 PM* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 770 0
2 HD 284248 Pe* 04 14 35.5161858536 +22 21 04.252516252 9.49 9.68 9.23 8.77 8.43 sdG0 185 0
3 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17 9.7 9.6   sdF0 174 0
4 HD 45282 Pe* 06 26 40.7720940072 +03 25 29.792391024 8.71 8.69 8.03     Gwl 154 0
5 HD 233511 PM* 08 19 22.5714563279 +54 05 09.623339988 10.02 10.24   9.4   F4 134 0
6 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 790 0
7 BD+29 2091 PM* 10 47 23.1623890044 +28 23 55.925628075   10.72   10.1   F5 141 0
8 HD 94028 PM* 10 51 28.1256073369 +20 16 38.965439278 8.51 8.69 8.22 7.82 7.54 F8 358 0
9 BD-04 3208 PM* 12 07 15.0721580835 -05 44 01.612773628   10.40 9.99     A7 146 0
10 BD+34 2476 PM* 13 59 09.4837849799 +33 51 39.379962282 10.25 10.44   9.7   sdF5 160 0
11 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 930 0
12 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 199 0
13 HD 338529 PM* 19 32 31.9104668184 +26 23 26.117367216   9.72   9.2   B5 207 0
14 HD 188510 PM* 19 55 09.6782304000 +10 44 27.398607828 9.30 9.41   8.5   G5V: 253 0
15 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 302 0
16 BD+41 3931 PM* 20 55 16.7551875178 +42 18 00.680491946       10.0   G5 95 0
17 HD 201891 Pe* 21 11 59.0321495469 +17 43 39.890919730 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 393 0
18 BD+26 4251 PM* 21 43 57.1238515464 +27 23 23.989925868       9.9   F6 87 0
19 BD+75 839 ** 22 35 52.6308240770 +76 29 32.568422416       9.1   G0wl 43 0

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