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


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET09:30:36

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 - 2020
#notes
1 HD 19445 PM* 03 08 25.5884 +26 19 51.400 8.29 8.52 8.06 7.60 7.27 G2VFe-3 734 0
2 HD 284248 PM* 04 14 35.5161833236 +22 21 04.254015290 9.49 9.68 9.23 8.77 8.43 sdG0 164 0
3 BD+03 740 HB* 05 01 16.6227347580 +04 06 37.023779331 9.97 10.17   9.6   sdF0 157 0
4 HD 45282 Pe* 06 26 40.7720108507 +03 25 29.794070200 8.71 8.69 8.03     Gwl 138 0
5 HD 233511 PM* 08 19 22.5717671718 +54 05 09.627780721 10.02 10.24   9.4   F4 120 0
6 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 710 0
7 BD+29 2091 PM* 10 47 23.1625623007 +28 23 55.928286438   10.72   10.1   F5 125 0
8 HD 94028 PM* 10 51 28.1254469804 +20 16 38.965521484 8.51 8.69 8.22 7.82 7.54 F8 325 0
9 BD-04 3208 PM* 12 07 15.0719832426 -05 44 01.609304815   10.40 9.99     A7 131 0
10 BD+34 2476 PM* 13 59 09.4838035693 +33 51 39.380333439 10.25 10.44   9.7   sdF5 147 0
11 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 846 0
12 BD+02 3375 PM* 17 39 45.5950264172 +02 24 59.607595293 10.18 10.40 9.92 9.47 9.12 A5 180 0
13 HD 338529 PM* 19 32 31.9104538188 +26 23 26.116678290   9.72   9.2   B5 194 0
14 HD 188510 PM* 19 55 09.6783577203 +10 44 27.395091177 9.30 9.41   8.5   G5V: 232 0
15 HD 194598 PM* 20 26 11.9185966774 +09 27 00.429262518 8.62 8.82 8.34 7.90 7.56 F8 283 0
16 BD+41 3931 PM* 20 55 16.7552935756 +42 18 00.676419326       10.0   G5 85 0
17 HD 201891 PM* 21 11 59.0322335571 +17 43 39.888647667 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 366 0
18 BD+26 4251 PM* 21 43 57.1238901563 +27 23 23.991146537       9.9   F6 72 0
19 BD+75 839 ** 22 35 52.6308240770 +76 29 32.568422416       9.1   G0wl 35 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-09:30:36

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