2005A&A...441.1149D


Query : 2005A&A...441.1149D

2005A&A...441.1149D - Astronomy and Astrophysics, volume 441, 1149-1156 (2005/10-3)

Abundances of Mn, Co and Eu in a sample of 20 F-G disk stars: the influence of hyperfine structure splitting.

DEL PELOSO E.F., CUNHA K., DA SILVA L. and PORTO DE MELLO G.F.

Abstract (from CDS):

We present Mn, Co and Eu abundances for a sample of 20 disk F and G dwarfs and subgiants with metallicities in the range -0.8≤[Fe/H]≤+0.3. We investigate the influence of hyperfine structure (HFS) on the derived abundances of Mn and Co by using HFS data from different sources in the literature, as well as calculated HFS from interaction factors A and B. Eu abundances were obtained from spectral synthesis of one EuII line that takes into account HFS from a series of recent laboratory measurements. For the lines analysed in this study, we find that for manganese, the differences between abundances obtained with different HFSs are no greater than 0.10dex. Our cobalt abundances are even less sensitive to the choice of HFS than Mn, presenting a 0.07dex maximum difference between determinations with different HFSs. However, the cobalt HFS data from different sources are significantly different. Our abundance results for Mn offer an independent confirmation of literature results, favouring type Ia supernovae as the main nucleosynthesis site of Mn production, in contrast to trends of Mn versus metallicity previously reported in the literature. For Co, we obtain [Co/Fe]∼0.0 in the range -0.3<[Fe/H]<+0.3 and [Co/Fe] rising to a level of +0.2 when [Fe/H] decreases from -0.3 to -0.8, in disagreement with recent results in the literature. The observed discrepancies may be attributed to the lack of HFS in the works we used for comparison. Our results for Eu are in accordance with low-mass type II supernovae being the main site of the r-process nucleosynthesis.

Abstract Copyright:

Journal keyword(s): stars: abundances - atomic data

VizieR on-line data: <Available at CDS (J/A+A/441/1149): stars.dat table2.dat table3.dat>

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 562 0
2 HD 9562 PM* 01 33 42.8353548073 -07 01 31.236482634 6.61 6.40 5.76     G1V 241 0
3 * lam02 For PM* 02 36 58.6079324808 -34 34 40.713450652 6.67 6.45 5.79     G1V 186 1
4 * zet01 Ret PM* 03 17 46.1632605674 -62 34 31.154247481 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 275 0
5 * zet02 Ret ** 03 18 12.8185412558 -62 30 22.917300282   5.814 5.228     G1V 334 0
6 * 10 Tau PM* 03 36 52.1448022536 +00 23 58.536917738 5.23 5.15 4.30 4.09 3.77 F9IV-V 534 0
7 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 451 0
8 HD 30562 PM* 04 48 36.3850664486 -05 40 26.554292788   6.40 5.77     G2IV 225 1
9 HD 43947 * 06 19 40.1735411907 +16 00 47.694982195   7.16 6.62     F8V 116 0
10 HD 52298 PM* 06 57 45.4424359420 -52 38 54.476011165   7.40 6.94     F8VFe-1CH-0.5 52 0
11 HD 59984 PM* 07 32 05.7631181661 -08 52 52.773345653   6.431 5.916     G0VFe-1.6CH-0.5 194 0
12 * 171 Pup PM* 07 45 34.9191268687 -34 10 21.283643355   5.909 5.362     F9V 285 0
13 HD 76932 PM* 08 58 43.9328634171 -16 07 57.805389219 6.47 6.39 5.86     G2VFe-1.8CH-1 372 0
14 HD 102365 PM* 11 46 31.0719919710 -40 30 01.279976346 5.65 5.55 4.88 4.35 3.97 G2V 295 1
15 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1171 0
16 HD 131117 PM* 14 52 33.1012321201 -30 34 38.120683158   6.89 6.29     G0/1V 105 0
17 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 482 2
18 * phi02 Pav PM* 20 40 02.6380533620 -60 32 56.017316242   5.63 5.121     G0VFe-0.8CH-0.5 165 1
19 HD 199288 PM* 20 57 40.0679487434 -44 07 45.739637893   7.11 6.52     G2VFe-1.0 176 0
20 * gam Pav PM* 21 26 26.6048372 -65 21 58.314484 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 383 0

    Equat.    Gal    SGal    Ecl

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2021.07.28-17:20:25

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