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

Query : 2011A&A...530A.105A

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 - 2024 		#notes
1 * zet Tuc PM* 00 20 04.2586334956 -64 52 29.257190108 4.82 4.80 4.23 3.73 3.40 F9.5V 380 0
2 2MASS J00203619+2347376 Pe* 00 20 36.1923434544 +23 47 37.617775440   14.84 14.5     ~ 27 0
3 BPS CS 29527-0015 Pe* 00 29 10.6814565504 -19 10 07.305102624   14.61 14.24     CEMP-no 57 0
4 HE 0027-3613 Pe* 00 30 15.9610744584 -35 56 51.229784760     14.74     ~ 30 0
5 HD 2796 Pe* 00 31 16.9147531152 -16 47 40.790991624 9.58 9.28 8.50 8.14 8.67 Fw 193 0
6 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 224 0
7 BPS CS 22953-0003 Pe* 01 02 15.8723379360 -61 43 45.836012208   14.43 13.75 13.339 12.886 KIIvw 70 0
8 2MASS J01183829-3041026 Pe* 01 18 38.3021768400 -30 41 02.851310832 14.730 14.94 14.6     ~ 25 0
9 BPS CS 29518-0051 Pe* 01 24 10.0049733024 -28 15 21.115362312 13.567 13.62 13.02 12.594 12.162 ~ 32 0
10 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 291 0
11 BPS CS 31061-0032 Pe* 02 38 43.3009378608 +03 19 02.563623012   14.30 13.90 13.581 13.290 ~ 26 0
12 HE 0239-1340 Pe* 02 41 42.3721546152 -13 28 10.603797240   14.73 13.97 13.566 13.080 CEMP-no 59 0
13 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 74 0
14 2MASS J03142084-1035112 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 67 0
15 BPS CS 22177-0009 Pe* 04 07 40.6490981040 -25 02 43.970266068   14.67 14.27     ~ 33 0
16 HE 0409-1212 Pe* 04 12 13.8814287960 -12 05 05.075250072   13.843 12.897   11.764 ~ 65 0
17 BPS CS 22186-0025 Pe* 04 24 32.7982834272 -37 09 02.518136460   14.99 14.24 13.740 13.269 ~ 36 0
18 * R Eri ** 04 55 18.6578319504 -16 25 03.974374884   6.578 5.715     G6/8III 38 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 1864 0
20 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 47 0
21 2MASS J14005447+2246423 Pe* 14 00 54.4740571128 +22 46 42.087313956 14.317 14.548 14.2     ~ 23 0
22 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 854 0
23 BPS BS 16550-0087 Pe* 14 10 26.7272915496 +18 01 23.732433480   14.59 13.76 13.211 12.688 ~ 24 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 2318 1
25 BPS BS 16477-0003 Pe* 14 32 56.9231765928 +06 46 06.974256288   14.94 14.22 13.727 13.224 ~ 35 0
26 2MASS J14543927+0421380 Pe* 14 54 39.2685981792 +04 21 38.099145888   13.02 12.32 11.849 11.376 ~ 47 0
27 BPS BS 16968-0061 Pe* 15 01 06.1171458744 +03 42 45.573411168   13.73 13.22 13.39   ~ 32 0
28 UCAC2 31517587 Pe* 15 08 29.6579865432 -00 35 59.273507796   13.37 12.95   12.37 ~ 26 0
29 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1358 0
30 BPS CS 22878-0101 Pe* 16 45 31.4513454168 +08 14 45.470265900   14.59 13.79   12.673 KIIvw 60 0
31 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 224 0
32 BPS CS 22891-0200 Pe* 19 35 19.0776472464 -61 42 24.374080224   14.77 13.93   12.79 CEMP-no 41 0
33 BPS CS 22891-0209 Pe* 19 42 02.1802427088 -61 03 44.534898612   13.03 12.18     KIIvw 57 0
34 UCAC2 7177623 Pe* 19 42 26.8926894816 -56 58 34.059037980   14.27 13.63     ~ 51 0
35 HD 186478 SB* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 154 0
36 UCAC2 5726991 Pe* 19 53 49.7804195664 -59 40 00.163242192   13.592 12.620   11.48 KIIvw 47 0
37 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 173 0
38 BPS CS 22873-0166 Pe* 20 19 22.0362485016 -61 30 15.119987544   12.818 11.802 11.52 10.57 KIIvw 55 0
39 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 88 0
40 BPS CS 22950-0046 Pe* 20 21 28.3975657104 -13 16 33.601931364   15.13 14.224 13.639 13.066 CEMP-no 40 0
41 BPS CS 22897-0008 Pe* 21 03 11.8565397504 -65 05 08.852220600   14.02 13.33     CEMP-no 70 0
42 BPS CS 29506-0007 Pe* 21 20 28.6541822328 -20 46 22.955304144     14.18     ~ 31 0
43 BPS CS 29506-0090 Pe* 21 30 28.8706762776 -22 10 41.578379040     14.33     ~ 29 0
44 BPS CS 29495-0041 Pe* 21 36 33.2900452248 -28 18 48.440793960 14.111 14.15 13.34   12.222 ~ 32 0
45 HE 2141-3741 RG* 21 44 51.1647807408 -37 27 55.017356112   14.10 13.47     CEMP-no 55 0
46 BPS CS 22948-0093 Pe* 21 50 31.5180047928 -41 07 49.355148468   15.54 15.18     ~ 36 0
47 BPS CS 22956-0050 Pe* 21 58 05.8340681280 -65 13 27.160682772   14.95 14.25 13.745 13.211 CEMP-no 40 0
48 BPS BS 17569-0049 Pe* 22 04 58.3605927288 +04 01 32.135832984 14.503 14.263 13.126 13.122 12.259 ~ 34 0
49 BPS CS 22965-0054 Pe* 22 06 30.2933030688 -02 32 34.433318220   15.69 15.07 14.732 14.072 CEMP-no 36 0
50 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 448 0
51 BPS CS 29516-0041 Pe* 22 21 48.8262598080 +02 28 44.867730936 13.291 13.4 12.74 12.325 12.013 ~ 39 0
52 2MASS J22261535+0251462 Pe* 22 26 15.3575269416 +02 51 46.326341232   14.43 13.57 13.011 12.416 ~ 36 0
53 BPS CS 29491-0053 Pe* 22 36 56.2965716592 -28 31 06.577096368   13.76 12.92 12.380 11.812 ~ 34 0
54 BPS CS 22888-0031 Pe* 23 11 32.4788498208 -35 26 42.872735796   15.31 14.90     CEMP-no 36 0
55 BPS CS 22949-0048 Pe* 23 26 07.4169241824 -05 50 06.903492036   14.48 13.67 13.154 12.639 CEMP-no 33 0
56 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.12 14.36   13.358 CEMP-no 180 0
57 2MASS J23350705-3022543 Pe* 23 35 07.0484945928 -30 22 54.278132700 14.694 14.97 14.6     ~ 29 0
58 HE 2334-0604 RG* 23 37 28.6873103640 -05 47 56.594641632   14.03 13.28 12.768 12.249 KIIvw 70 0
59 2MASS J23485776-2939228 Pe* 23 48 57.7540034928 -29 39 22.824085392 14.759   14.3   13.512 ~ 35 0
60 SB 966 Pe* 23 53 40.2978963936 -26 58 43.988391156   13.50 13.050     sdF/G? 37 0

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