2009A&A...501..519B


Query : 2009A&A...501..519B

2009A&A...501..519B - Astronomy and Astrophysics, volume 501, 519-530 (2009/7-2)

First stars. XII. Abundances in extremely metal-poor turnoff stars, and comparison with the giants.

BONIFACIO P., SPITE M., CAYREL R., HILL V., SPITE F., FRANCOIS P., PLEZ B., LUDWIG H.-G., CAFFAU E., MOLARO P., DEPAGNE E., ANDERSEN J., BARBUY B., BEERS T.C., NORDSTROEM B. and PRIMAS F.

Abstract (from CDS):

The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to understanding the early chemical evolution of the Galaxy. Most existing data, however, treat giant stars that may have experienced internal mixing later. We aim to compare the results for giants with new, accurate abundances for all observable elements in 18 EMP turnoff stars. VLT/UVES spectra at R∼45000 and S/N∼130 per pixel (λλ330-1000nm) are analysed with OSMARCS model atmospheres and the TURBOSPECTRUM code to derive abundances for C, Mg, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Zn, Sr, and Ba. For Ca, Ni, Sr, and Ba, we find excellent consistency with our earlier sample of EMP giants, at all metallicities. However, our abundances of C, Sc, Ti, Cr, Mn and Co are ∼0.2dex larger than in giants of similar metallicity. Mg and Si abundances are ∼0.2dex lower (the giant [Mg/Fe] values are slightly revised), while Zn is again ∼0.4dex higher than in giants of similar [Fe/H] (6 stars only). For C, the dwarf/giant discrepancy could possibly have an astrophysical cause, but for the other elements it must arise from shortcomings in the analysis. Approximate computations of granulation (3D) effects yield smaller corrections for giants than for dwarfs, but suggest that this is an unlikely explanation, except perhaps for C, Cr, and Mn. NLTE computations for Na and Al provide consistent abundances between dwarfs and giants, unlike the LTE results, and would be highly desirable for the other discrepant elements as well. Meanwhile, we recommend using the giant abundances as reference data for Galactic chemical evolution models.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/501/519): table7.dat table1.dat ew.dat>

Simbad objects: 58

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Number of rows : 58
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SB 44 SB* 00 07 37.5160264968 -35 31 17.704959708   13.23 12.76 12.76   sdF 79 0
2 BPS CS 31085-0024 Pe* 00 08 27.9327429648 +10 54 19.831856724   14.62 14.00     ~ 11 0
3 BPS BS 17570-0063 Pe* 00 20 36.1923434544 +23 47 37.617775440   14.84 14.51     ~ 24 0
4 BPS CS 29527-0015 Pe* 00 29 10.6814565504 -19 10 07.305102624   14.61 14.24     CEMP-no 53 0
5 HE 0027-3613 Pe* 00 30 15.9610744584 -35 56 51.229784760     14.74     ~ 29 0
6 HD 2796 Pe* 00 31 16.9147531152 -16 47 40.790991624 9.58 9.28 8.50 8.14 8.67 Fw 188 0
7 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 215 0
8 BPS CS 22953-0003 Pe* 01 02 15.8723379360 -61 43 45.836012208   14.43 13.75 13.339 12.886 KIIvw 64 0
9 BPS CS 29518-0020 * 01 12 13.2160928832 -31 00 05.358952296 14.164 14.41 14.00     ~ 19 0
10 BPS CS 29518-0043 * 01 18 38.3021768400 -30 41 02.851310832 14.730 14.94 14.57     ~ 24 0
11 BPS CS 29518-0051 Pe* 01 24 10.0049733024 -28 15 21.115362312 13.567 13.62 13.02 12.594 12.162 ~ 31 0
12 BPS CS 22953-0037 Pe* 01 25 06.6508649808 -59 16 00.742176912   14.01 13.64   13.13 CEMP-no 41 0
13 BPS CS 31082-0001 Pe* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 276 0
14 BPS CS 31061-0032 Pe* 02 38 43.3009378608 +03 19 02.563623012   14.30 13.90 13.581 13.290 ~ 26 0
15 HE 0239-1340 Pe* 02 41 42.3721546152 -13 28 10.603797240   14.73 13.97 13.566 13.080 CEMP-no 56 0
16 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 74 0
17 2MASS J03142084-1035112 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 65 0
18 BPS CS 22177-0009 Pe* 04 07 40.6490981040 -25 02 43.970266068   14.67 14.27     ~ 32 0
19 HE 0409-1212 Pe* 04 12 13.8814287960 -12 05 05.075250072   13.843 12.897   11.764 ~ 65 0
20 BPS CS 22186-0025 Pe* 04 24 32.7982834272 -37 09 02.518136460   14.99 14.24 13.740 13.269 ~ 35 0
21 UCAC4 371-007255 * 05 10 35.4729523440 -15 51 38.255264316     15.38     ~ 6 0
22 BPS BS 16076-0006 Pe* 12 48 22.7519584056 +20 56 44.029766004   13.88 13.36 13.115 12.706 ~ 20 0
23 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 47 0
24 BPS BS 16554-0041 Pe* 14 00 54.4740571128 +22 46 42.087313956 14.317 14.548 14.230     ~ 22 0
25 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 811 0
26 BPS BS 16477-0003 Pe* 14 32 56.9231765928 +06 46 06.974256288   14.94 14.22 13.727 13.224 ~ 35 0
27 BPS CS 30325-0094 Pe* 14 54 39.2685981792 +04 21 38.099145888   13.02 12.32 11.849 11.376 ~ 45 0
28 BPS BS 16968-0061 Pe* 15 01 06.1171458744 +03 42 45.573411168   13.73 13.22 13.39   ~ 31 0
29 UCAC2 31517587 Pe* 15 08 29.6579865432 -00 35 59.273507796   13.37 12.95   12.37 ~ 26 0
30 BPS CS 22878-0101 Pe* 16 45 31.4513454168 +08 14 45.470265900   14.59 13.79   12.673 KIIvw 58 0
31 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 212 0
32 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1911 0
33 BPS CS 22891-0209 Pe* 19 42 02.1802427088 -61 03 44.534898612   13.03 12.18     KIIvw 56 0
34 UCAC2 7177623 Pe* 19 42 26.8926894816 -56 58 34.059037980   14.27 13.63     ~ 48 0
35 HD 186478 Pe* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 145 0
36 UCAC2 5726991 Pe* 19 53 49.7804195664 -59 40 00.163242192   13.592 12.620   11.48 KIIvw 46 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 170 0
38 BPS CS 22873-0166 Pe* 20 19 22.0362485016 -61 30 15.119987544   12.818 11.802 11.52 10.57 KIIvw 51 0
39 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 84 0
40 BPS CS 22897-0008 Pe* 21 03 11.8565397504 -65 05 08.852220600   14.02 13.33     CEMP-no 68 0
41 BPS CS 29506-0007 Pe* 21 20 28.6541822328 -20 46 22.955304144     14.18     ~ 31 0
42 BPS CS 29506-0090 Pe* 21 30 28.8706762776 -22 10 41.578379040     14.33     ~ 28 0
43 BPS CS 29495-0041 Pe* 21 36 33.2900452248 -28 18 48.440793960 14.111 14.15 13.34   12.222 ~ 32 0
44 HE 2141-3741 Pe* 21 44 51.1647807408 -37 27 55.017356112   14.10 13.47     CEMP-no 54 0
45 BPS CS 22948-0093 Pe* 21 50 31.5180047928 -41 07 49.355148468   15.54 15.18     ~ 36 0
46 BPS CS 22956-0050 Pe* 21 58 05.8340681280 -65 13 27.160682772   14.95 14.25 13.745 13.211 CEMP-no 37 0
47 2MASS J22045836+0401321 Pe* 22 04 58.3605927288 +04 01 32.135832984 14.503 14.25 13.36 12.805 12.259 ~ 31 0
48 BPS CS 22965-0054 Pe* 22 06 30.2933030688 -02 32 34.433318220   15.69 15.07 14.732 14.072 CEMP-no 35 0
49 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 433 0
50 BPS CS 29516-0041 Pe* 22 21 48.8262598080 +02 28 44.867730936 13.291 13.4 12.74 12.325 12.013 ~ 38 0
51 BPS CS 29516-0024 Pe* 22 26 15.3575269416 +02 51 46.326341232   14.43 13.57 13.011 12.416 ~ 34 0
52 BPS CS 29491-0053 Pe* 22 36 56.2965716592 -28 31 06.577096368   13.76 12.92 12.380 11.812 ~ 32 0
53 BPS CS 22888-0031 Pe* 23 11 32.4788498208 -35 26 42.872735796   15.31 14.90     CEMP-no 35 0
54 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.12 14.36   13.358 CEMP-no 175 0
55 BPS CS 22966-0011 Pe* 23 35 07.0484945928 -30 22 54.278132700 14.694 14.97 14.55     ~ 27 0
56 HE 2334-0604 Pe* 23 37 28.6873103640 -05 47 56.594641632   14.03 13.28 12.768 12.249 KIIvw 69 0
57 BPS CS 22966-0057 Pe* 23 48 57.7540034928 -29 39 22.824085392 14.759   14.32   13.512 ~ 33 0
58 SB 966 Pe* 23 53 40.2978963936 -26 58 43.988391156   13.50 13.050     sdF/G? 36 0

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2023.01.31-08:27:02

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