2002A&A...390...91B


Query : 2002A&A...390...91B

2002A&A...390...91B - Astronomy and Astrophysics, volume 390, 91-101 (2002/7-4)

The lithium content of the globular cluster NGC 6397.

BONIFACIO P., PASQUINI L., SPITE F., BRAGAGLIA A., CARRETTA E., CASTELLANI V., CENTURION M., CHIEFFI A., CLAUDI R., CLEMENTINI G., D'ANTONA F., DESIDERA S., FRANCOIS P., GRATTON R.G., GRUNDAHL F., JAMES G., LUCATELLO S., SNEDEN C. and STRANIERO O.

Abstract (from CDS):

We make use of high resolution, high signal-to-noise ratio spectra of 12 turn-off stars in the metal-poor globular cluster NGC 6397 to measure its lithium content. We conclude that they all have the same lithium abundance A(Li)=2.34 with a standard deviation of 0.056dex. We use this result, together with Monte Carlo simulations, to estimate that the maximum allowed intrinsic scatter is of the order of 0.035dex. This is a new stringent constraint to be fulfilled by stellar models which predict Li depletion. We argue that although a mild depletion of 0.1-0.2dex, as predicted by recent models, cannot be ruled out, there is no compelling reason for it. This fact, together with the good agreement with the Li abundance observed in field stars, supports the primordial origin of lithium in metal-poor stars. Taking the above value as the primordial lithium abundance implies a cosmic baryonic density which is either Ωbh2=0.016±0.004 or Ωbh2=0.005+0.0026–0.0006, from the predictions of standard big bang nucleosynthesis. The high baryonic density solution is in agreement with recent results on the primordial abundance of deuterium and 3He and on the estimates derived from the fluctuations of the cosmic microwave background.

Abstract Copyright:

Journal keyword(s): diffusion - stars: abundances - stars: atmospheres - stars: Population II - Galaxy: globular clusters: NGC 6397 - cosmology: observations

CDS comments: Table 1, 2: The 5 stars are Cl* NGC 6397 GVS NNNNNN. Table 2 : C4602 is a misprint for C4062 = NGC 6397 4062. A611 and A853 = Cl* NGC 6397 ABCPO 611,853. Other A objects = Cl* NGC 6397 ALA NNNN.

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2191 0
2 NGC 3680 OpC 11 25 34 -43 14.4   8.40 7.6     ~ 301 0
3 HD 108177 PM* 12 25 34.9568267745 +01 17 02.259553591 9.87 10.09 9.66 9.21 8.89 F0V 243 0
4 BD+18 2647 HS* 12 41 51.7899961800 +17 31 19.750566756 10.261 11.70 11.63 11.969 12.159 sdOpec 170 1
5 HD 116064 Pe* 13 21 43.7779908364 -39 18 40.025179966   9.26 8.81     F9IV-Vm-5 128 0
6 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 893 0
7 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2107 0
8 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2001 0
9 Cl* NGC 6397 GVS 1543 * 17 39 36.17 -53 40 20.7           ~ 5 0
10 Cl* NGC 6397 GVS 1905 * 17 40 01.13 -53 35 56.9           ~ 5 0
11 Cl* NGC 6397 GVS 1622 * 17 40 09.0995847720 -53 43 26.481113472   16.596 16.200   15.622 ~ 6 0
12 Cl* NGC 6397 GVS 201432 * 17 40 16.0805487576 -53 47 18.740098536   16.669 16.278   15.708 ~ 6 0
13 Cl* NGC 6397 GVS 202765 * 17 40 41.5970413368 -53 45 49.368731148   16.662 16.271   15.701 ~ 6 0
14 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1885 1
15 HD 166913 PM* 18 16 25.6832938176 -59 24 11.239435980   8.66 8.23     F5/7Vw 128 0
16 HD 181743 PM* 19 23 42.7454702782 -45 04 56.914961207   10.13 9.71     F4 103 0
17 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1076 0
18 BPS CS 22873-0139 SB* 20 05 55.1466054456 -59 17 11.461854084       13.810   ~ 33 0
19 LP 877-23 PM* 22 52 41.0353986762 -20 35 32.994432457   13.02 11.90     ~ 107 0
20 Cl* NGC 6397 ALA 447 * ~ ~   16.769 16.185     ~ 2 0
21 Cl* NGC 6397 ABCCO 853 * ~ ~     16.01     ~ 4 0
22 Cl* NGC 6397 ABCCO 611 * ~ ~     16.18     ~ 4 0
23 Cl* NGC 6397 ALA 2111 * ~ ~   16.609 16.011     ~ 5 0
24 NGC 6397 4062 * ~ ~   16.70 16.14     ~ 7 0
25 Cl* NGC 6397 ALA 2084 * ~ ~   16.740 16.198     ~ 3 0
26 Cl* NGC 6397 ALA 1406 * ~ ~   16.705 16.145     ~ 4 0
27 Cl* NGC 6397 ALA 721 * ~ ~   16.752 16.203     ~ 2 0
28 Cl* NGC 6397 ALA 575 * ~ ~   16.740 16.167     ~ 2 0
29 Cl* NGC 6397 ALA 228 * ~ ~   16.635 16.068     ~ 6 0

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2022.08.09-03:19:19

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