2011A&A...530A.105A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET20:12:39

2011A&A...530A.105A - Astronomy and Astrophysics, volume 530A, 105-105 (2011/6-1)

NLTE strontium abundance in a sample of extremely metal poor stars and the Sr/Ba ratio in the early Galaxy.

ANDRIEVSKY S.M., SPITE F., KOROTIN S.A., FRANCOIS P., SPITE M., BONIFACIO P., CAYREL R. and HILL V.

Abstract (from CDS):

Heavy element abundances in extremely metal-poor stars provide strong constraints on the processes of forming these elements in the first stars. We attempt to determine precise abundances of strontium in a homogeneous sample of extremely metal-poor stars. The abundance of strontium in 54 very or extremely metal-poor stars, was redetermined by abandoning the local thermodynamic equilibrium (LTE) hypothesis, and fitting non-LTE (NLTE) profiles to the observed spectral lines. The corrected Sr abundances and previously obtained NLTE Ba abundances are compared to the predictions of several hypothetical formation processes for the lighter neutron-capture elements. Our NLTE abundances confirm the previously determined huge scatter of the strontium abundance in low metallicity stars. This scatter is also found (and is even larger) at very low metallicities (i.e. early in the chemical evolution). The Sr abundance in the extremely metal-poor (EMP) stars is compatible with the main r-process involved in other processes (or by variations of the r-process), as we briefly discuss.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - Galaxy: halo - Galaxy: evolution - stars: abundances - supernovae: general

Simbad objects: 60

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Number of rows : 60

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 * zet Tuc PM* 00 20 04.2599713 -64 52 29.254760 4.82 4.80 4.23 3.73 3.40 F9.5V 336 0
2 BPS BS 17570-0063 Pe* 00 20 36.1934507252 +23 47 37.625665043   14.84 14.51     ~ 23 0
3 BPS CS 29527-0015 Pe* 00 29 10.6813715074 -19 10 07.306464364   14.61 14.24     CEMP-no 50 0
4 HE 0027-3613 Pe* 00 30 15.9613306172 -35 56 51.230873749     14.74     ~ 27 0
5 HD 2796 Pe* 00 31 16.9149599675 -16 47 40.792690842 9.58 9.28 8.50 8.14 8.67 Fw 177 0
6 CD-38 245 Pe* 00 46 36.1954714218 -37 39 33.555736375   12.733 11.929 13.39 10.996 KIIvw 199 0
7 BPS CS 22953-0003 Pe* 01 02 15.8722809261 -61 43 45.836705614   14.43 13.75 13.339 12.886 KIIvw 52 0
8 BPS CS 29518-0043 * 01 18 38.3021781706 -30 41 02.851142792 14.730 14.94 14.57     ~ 23 0
9 BPS CS 29518-0051 Pe* 01 24 10.0046408484 -28 15 21.119402152 13.567 13.62 13.02 12.594 12.162 ~ 30 0
10 BPS CS 31082-0001 Pe* 01 29 31.1311330115 -16 00 45.496485322 12.527 12.427 11.642 11.189 10.713 ~ 237 0
11 BPS CS 31061-0032 Pe* 02 38 43.3010009273 +03 19 02.564348687   14.30 13.90 13.581 13.290 ~ 25 0
12 HE 0239-1340 Pe* 02 41 42.3721693746 -13 28 10.604872550   14.73 13.97 13.566 13.080 CEMP-no 52 0
13 HE 0305-5442 Pe* 03 06 29.5014936276 -54 30 32.498352902   14.44 13.70 13.212 12.715 KIIvw 70 0
14 HE 0311-1046 Pe* 03 14 20.8495240680 -10 35 11.279671787   13.54 12.73 12.204 11.693 KIIvw 62 0
15 BPS CS 22177-0009 Pe* 04 07 40.6490023717 -25 02 43.969982222   14.67 14.27     ~ 29 0
16 HE 0409-1212 Pe* 04 12 13.8814170981 -12 05 05.075798490   13.843 12.897   11.764 ~ 57 0
17 BPS CS 22186-0025 Pe* 04 24 32.7982638728 -37 09 02.518352449   14.99 14.24 13.740 13.269 ~ 33 0
18 HD 31444 ** 04 55 18.6583957296 -16 25 04.043777039   6.578 5.715     G6/8III 31 0
19 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1743 0
20 BPS BS 16467-0062 Pe* 13 42 00.6325668250 +17 48 40.825137829   14.69 14.09 13.665 13.216 ~ 44 0
21 BPS BS 16554-0041 Pe* 14 00 54.4741225648 +22 46 42.087338110 14.317 14.548 14.230     ~ 21 0
22 HD 122563 Pe* 14 02 31.8456299772 +09 41 09.942736952 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 729 0
23 BPS BS 16550-0087 Pe* 14 10 26.7273235719 +18 01 23.732692140   14.59 13.76 13.211 12.688 ~ 21 0
24 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2101 0
25 BPS BS 16477-0003 Pe* 14 32 56.9230863125 +06 46 06.975505394   14.94 14.22 13.727 13.224 ~ 33 0
26 BPS CS 30325-0094 Pe* 14 54 39.2685324873 +04 21 38.098655567   13.02 12.32 11.849 11.376 ~ 42 0
27 BPS BS 16968-0061 Pe* 15 01 06.1170779628 +03 42 45.573988083   13.73 13.22 13.39   ~ 27 0
28 UCAC2 31517587 Pe* 15 08 29.6580275604 -00 35 59.273543748   13.37 12.95   12.37 ~ 25 0
29 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1142 0
30 BPS CS 22878-0101 Pe* 16 45 31.4514010341 +08 14 45.471045094   14.59 13.79   12.673 KIIvw 54 0
31 BD+17 3248 HB* 17 28 14.4691668039 +17 30 35.848406966   10.02 9.34     KIIvw 196 0
32 BPS CS 22891-0200 Pe* 19 35 19.0776617459 -61 42 24.374411136   14.77 13.93   12.79 CEMP-no 35 0
33 BPS CS 22891-0209 Pe* 19 42 02.1800028329 -61 03 44.536144090   13.03 12.18     KIIvw 52 0
34 UCAC2 7177623 Pe* 19 42 26.8930018981 -56 58 34.061929902   14.27 13.63     ~ 45 0
35 HD 186478 Pe* 19 45 14.1410795461 -17 29 27.071420634   10.116 9.302 8.527 7.961 K2III 127 0
36 UCAC2 5726991 Pe* 19 53 49.7800945675 -59 40 00.163969151   13.592 12.620   11.48 KIIvw 41 0
37 BD-18 5550 Pe* 19 58 49.7370363913 -18 12 11.142309703 10.18 10.03 9.35 9.04 8.74 CEMP-no 160 0
38 BPS CS 22873-0166 Pe* 20 19 22.0361305437 -61 30 15.121053020   12.818 11.802 11.52 10.57 KIIvw 44 0
39 BPS CS 22885-0096 Pe* 20 20 51.1729562140 -39 53 30.235406812   14.02 13.33     CEMP-no 81 0
40 BPS CS 22950-0046 Pe* 20 21 28.3976234633 -13 16 33.602336953   15.13 14.224 13.639 13.066 CEMP-no 37 0
41 BPS CS 22897-0008 Pe* 21 03 11.8563237064 -65 05 08.852932036   14.02 13.33     CEMP-no 61 0
42 BPS CS 29506-0007 Pe* 21 20 28.6541606696 -20 46 22.955747614     14.18     ~ 28 0
43 BPS CS 29506-0090 Pe* 21 30 28.8706794433 -22 10 41.578963371     14.33     ~ 25 0
44 BPS CS 29495-0041 Pe* 21 36 33.2901533828 -28 18 48.439267198 14.111 14.15 13.34   12.222 ~ 30 0
45 HE 2141-3741 Pe* 21 44 51.1647173336 -37 27 55.017357431   14.10 13.47     CEMP-no 50 0
46 BPS CS 22948-0093 Pe* 21 50 31.5179802313 -41 07 49.353957554   15.54 15.18     ~ 32 0
47 BPS CS 22956-0050 Pe* 21 58 05.8339798575 -65 13 27.160917994   14.95 14.25 13.745 13.211 CEMP-no 34 0
48 BPS BS 17569-0049 Pe* 22 04 58.3605638072 +04 01 32.135813469 14.503 14.25 13.36 12.805 12.259 ~ 27 0
49 BPS CS 22965-0054 Pe* 22 06 30.2933577439 -02 32 34.433172529   15.69 15.07 14.732 14.072 CEMP-no 32 0
50 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 401 0
51 BPS CS 29516-0041 Pe* 22 21 48.8261125099 +02 28 44.864481048 13.291 13.4 12.74 12.325 12.013 ~ 34 0
52 BPS CS 29516-0024 Pe* 22 26 15.3575399312 +02 51 46.325239449   14.43 13.57 13.011 12.416 ~ 31 0
53 BPS CS 29491-0053 Pe* 22 36 56.2964405478 -28 31 06.577841168   13.76 12.92 12.380 11.812 ~ 30 0
54 BPS CS 22888-0031 Pe* 23 11 32.4788632961 -35 26 42.874207261   15.31 14.90     CEMP-no 31 0
55 BPS CS 22949-0048 Pe* 23 26 07.4168124914 -05 50 06.904987686   14.48 13.67 13.154 12.639 CEMP-no 29 0
56 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 166 0
57 BPS CS 22966-0011 Pe* 23 35 07.0484328903 -30 22 54.279012782 14.694 14.97 14.55     ~ 24 0
58 HE 2334-0604 Pe* 23 37 28.6873335486 -05 47 56.594686365   14.03 13.28 12.768 12.249 KIIvw 66 0
59 BPS CS 22966-0057 Pe* 23 48 57.7535714010 -29 39 22.828517864 14.759   14.32   13.512 ~ 31 0
60 SB 966 Pe* 23 53 40.2977653893 -26 58 43.988331934   13.50 13.050     sdF/G? 34 0

    Equat.    Gal    SGal    Ecl

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2019.12.08-20:12:39

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