2004A&A...415..993N


Query : 2004A&A...415..993N

2004A&A...415..993N - Astronomy and Astrophysics, volume 415, 993-1007 (2004/3-1)

Sulphur and zinc abundances in Galactic stars and damped Lyα systems.

NISSEN P.E., CHEN Y.Q., ASPLUND M. and PETTINI M.

Abstract (from CDS):

High resolution spectra of 34 halo population dwarf and subgiant stars have been obtained with VLT/UVES and used to derive sulphur abundances from the λλ8694.0, 8694.6 and λλ9212.9, 9237.5 SI lines. In addition, iron abundances have been determined from 19 FeII lines and zinc abundances from the λλ4722.2, 4810.5 lines. The abundances are based on a classical 1D, LTE model atmosphere analysis, but effects of 3D hydrodynamical modelling on the [S/Fe], [Zn/Fe] and [S/Zn] ratios are shown to be small. We find that most halo stars with metallicities in the range -3.2<[Fe/H]←0.8 have a near-constant [S/Fe]≃+0.3; a least square fit to [S/Fe] vs. [Fe/H] shows a slope of only -0.04±0.01. Among halo stars with -1.2<[Fe/H]←0.8 the majority have [S/Fe]≃+0.3, but two stars (previously shown to have low α/Fe ratios) have [S/Fe]≃0.0. For disk stars with [Fe/H]>-1, [S/Fe] decreases with increasing [Fe/H]. Hence, sulphur behaves like other typical α-capture elements, Mg, Si and Ca. Zinc, on the other hand, traces iron over three orders of magnitude in [Fe/H], although there is some evidence for a small systematic Zn overabundance ([Zn/Fe]≃+0.1) among metal-poor disk stars and for halo stars with [Fe/H]←2.0. Recent measurements of S and Zn in ten damped Lyα systems (DLAs) with redshifts between 1.9 and 3.4 and zinc abundances in the range -2.1<[Zn/H]←0.15 show an offset relative to the [S/Zn]-[Zn/H] relation in Galactic stars. Possible reasons for this offset are discussed, including low and intermittent star formation rates in DLAs.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - galaxy: evolution - galaxies: high-redshift - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/A+A/415/993): stars.dat tablea1.dat>

Simbad objects: 51

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Number of rows : 51
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 QSO J0003-2603 QSO 00 03 22.9531962024 -26 03 18.304471908   18 17.53     ~ 291 0
2 LBQS 0013-0029 QSO 00 16 02.4050159808 -00 12 25.077257064   18.67 18.36     ~ 194 0
3 PHL 957 QSO 01 03 11.2741573824 +13 16 17.809871484   16.97 16.57     ~ 345 0
4 QSO J0307-4945 QSO 03 07 22.8949808808 -49 45 48.274545240     18.76     ~ 65 0
5 QSO J0407-4410 QSO 04 07 18.0880236912 -44 10 13.983623724   17.6 17.6     ~ 99 0
6 QSO B0551-36 QSO 05 52 46.1824785360 -36 37 27.608212524   17.72 17.57     ~ 97 0
7 QSO B0841+129 BLL 08 44 24.2445546984 +12 45 46.526286780   18.28 18.5     ~ 119 0
8 Ross 892 PM* 10 27 24.2460060626 +01 24 00.190284079   11.55   10.8   sdF8 71 0
9 HD 99382 PM* 11 25 50.5561375560 -36 54 13.856147388   9.69 9.20     F5V 6 0
10 BD-13 3442 Pe* 11 46 50.6525751264 -14 06 43.458063768   10.662 10.274     CEMP 107 0
11 HD 103723 PM* 11 56 36.0251513496 -21 25 09.829610868   10.554 10.091     F5/6V 79 0
12 HD 104004 PM* 11 58 30.1795848456 -33 41 24.029385576   10.97 10.41     G3/5V 19 0
13 HD 105004 PM* 12 05 24.8526164337 -26 35 43.750181317   10.96 10.39     F9 107 0
14 BD-04 3208 PM* 12 07 15.0721580835 -05 44 01.612773628   10.40 9.99     A7 147 0
15 Ross 453 PM* 12 10 55.7733238889 +00 23 54.332076195   11.53   10.9   F2 108 0
16 HD 106038 PM* 12 12 01.3688687080 +13 15 40.618559661 10.45 10.630 10.162 9.851 9.539 F6wl 191 0
17 HD 108177 PM* 12 25 34.9568267745 +01 17 02.259553591 9.87 10.09 9.66 9.21 8.89 F0V 253 0
18 HD 110621 PM* 12 43 43.2215753256 -44 40 31.562765508   10.34 9.92     Fpw 75 0
19 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 284 0
20 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 151 0
21 Ross 841 Pe* 14 02 30.0900761861 -05 39 05.181979951   11.508 11.149 10.866 10.576 sdA3 151 0
22 BD-13 3834 Pe* 14 10 27.0760325911 -13 56 04.295346820   11.261 10.681 10.305 9.908 G0: 86 0
23 V* BU Cir bC* 14 45 10.9595976864 -55 36 05.906309508 5.23 6.016 6.089     B2III 97 0
24 Wolf 550 SB* 14 50 07.8032346714 +00 50 27.127840325   11.47   10.8   sd:F5 79 0
25 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 938 0
26 BD+08 3095 PM* 15 50 58.9334638272 +08 25 23.721884040   10.60   9.8   G2 85 0
27 HD 146296 PM* 16 21 11.3151618845 -71 17 13.024312315   10.37 9.77     G3V 48 0
28 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 310 0
29 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 199 0
30 HD 160617 Pe* 17 42 49.3234249010 -40 19 15.503834657   9.18 8.7 8.394 8.065 G0 204 0
31 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2195 2
32 HD 179626 PM* 19 13 20.7189797919 -00 35 42.325251766   9.701 9.187 8.844 8.489 F5V 127 0
33 HD 181743 PM* 19 23 42.7454702782 -45 04 56.914961207   10.13 9.71     F4 106 0
34 CD-42 14278 PM* 19 32 19.1474936380 -42 12 43.711761026   10.76 10.29     F5Vwl 38 0
35 HD 188031 PM* 19 54 58.6573602356 -42 38 43.395207211   10.54 10.17     F0V 65 0
36 G 24-3 Pe* 20 05 44.3170407024 +04 02 52.812418452   10.92   10.2   sdF8 95 0
37 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 280 0
38 HD 340279 Pe* 20 24 45.4125969504 +25 03 07.109969040   11.23 10.8 10.7   A5 103 0
39 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 302 0
40 LP 815-43 Pe* 20 38 13.2998605176 -20 26 10.850795808   11.31 10.72     ~ 76 0
41 CD-30 18140 Pe* 20 44 06.2872647830 -30 00 07.597192977   10.326 9.932     F8 90 0
42 CD-35 14849 PM* 21 33 49.7524989129 -35 26 14.228198341   10.95 10.56 10.59   B8 72 0
43 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 518 0
44 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 569 0
45 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 116 0
46 L 1077-30 SB* 22 31 36.2183313448 +02 09 43.848163336   11.24   10.5   sd:F7 66 0
47 QSO J2246-6015 QSO 22 47 08.9258659440 -60 15 45.299400480           ~ 71 0
48 HD 215801 Pe* 22 48 29.4254660444 -46 03 50.538724185   10.46 10.1     F0w 65 0
49 QSO B2314-409 QSO 23 16 46.91990359 -40 41 21.0863175   17.9 17.9     ~ 71 1
50 BD+02 4651 PM* 23 19 40.4500387773 +03 22 16.694733495   10.67   9.9   sdF6 112 0
51 QSO B2343+125 QSO 23 46 28.200 +12 49 00.00     17.5     ~ 137 2

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