# 2014MNRAS.443.2426N

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 Query : 2014MNRAS.443.2426N

2014MNRAS.443.2426N - Mon. Not. R. Astron. Soc., 443, 2426-2435 (2014/September-3)

Is germanium (Ge, Z = 32) a neutron-capture element?

NIU P., LIU W., CUI W. and ZHANG B.

Abstract (from CDS):

Historically, Ge has been considered to be a neutron-capture element. In this case, the r-process abundance of Ge is derived by subtracting the s-process abundance from the total abundance in the Solar system. However, the Ge abundance of the metal-poor star HD 108317 is lower than that of the scaled residual r-process abundance' in the Solar system, about 1.2 dex. In this paper, based on a comparison of the Ge abundances of metal-poor stars and stellar yields, we find that the Ge abundances are not the result of the primary-like yields in massive stars and come mainly from the r-process. Based on the observed abundances of metal-poor stars, we derived the Ge abundances of the weak r-process and main r-process. The contributed percentage of the neutron-capture process to Ge in the Solar system is about 59 percent, which means that the contributed percentage of the Ge residual abundance' in the Solar system is about 41 percent. We find that the Ge `residual abundance' is produced as secondary-like yields in massive stars. This implies that the element Ge in the Solar system is not produced solely by the neutron-capture process.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances

Full paper

 Number of rows : 24
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 HD 2454 PM* 00 28 20.0424818616 +10 11 23.297664120   6.47   5.8   F5VSr 170 0
2 HD 6268 Pe* 01 03 18.1716378504 -27 52 49.953768852   9.725 9.046 8.601   F/Gw 143 0
3 HD 6755 SB* 01 09 43.0577179701 +61 32 50.264076956 8.48 8.40   7.3   G5 233 0
4 BPS CS 31082-0001 Pe* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 270 0
5 HD 16220 PM* 02 37 06.5693832624 +32 53 27.922933860   6.710 6.226     F8V 55 0
6 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 381 0
7 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 194 0
8 HD 94028 PM* 10 51 28.1256073369 +20 16 38.965439278 8.51 8.69 8.22 7.82 7.54 F8 347 0
9 HD 107113 PM* 12 16 51.3357296568 +86 26 08.947981572   6.76   6.1   F4V 81 0
10 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 157 0
11 HD 115444 Pe* 13 16 42.4590842616 +36 22 52.692135420   9.77 8.97 8.3 7.88 G9V 233 0
12 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 800 0
13 HD 122956 PM* 14 05 13.0244442888 -14 51 25.455804480   8.18 7.25 6.88   G6IV/VwF6 147 0
14 HD 126238 Pe* 14 25 29.9571431040 -43 38 36.948515460   8.44 7.68 7.44   G3/8wF0/2 107 1
15 HD 126587 Pe* 14 27 00.3636631296 -22 14 38.992940592   9.88 9.60 8.75   CEMP-no 128 0
16 HD 128279 Pe* 14 36 48.5108525999 -29 06 46.612858494 8.64 8.63 8.00     Gw 185 0
17 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 893 0
18 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 209 0
19 HD 160617 PM* 17 42 49.3234249010 -40 19 15.503834657   9.18 8.73 8.394 8.065 G0 194 0
20 HD 175305 RG* 18 47 06.4416868934 +74 43 31.451436187 8.07 7.93 7.18 6.52 6.03 G5III 208 0
21 HD 186478 Pe* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 142 0
22 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 168 0
23 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 431 0
24 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     G2IV 275 0

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2022.08.10-08:19:27

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