2011A&A...534A.103S


Query : 2011A&A...534A.103S

2011A&A...534A.103S - Astronomy and Astrophysics, volume 534A, 103-103 (2011/10-1)

Statistical equilibrium of silicon in the atmospheres of nearby metal-poor stars.

SHI J.R., GEHREN T. and ZHAO G.

Abstract (from CDS):

We discuss the statistical equilibrium of neutral and ionized silicon in the atmospheres of nearby metal-poor stars. We investigated the effects of non-local thermodynamic equilibrium (NLTE) and determined the silicon abundances. We used high resolution, high signal-to-noise ratio spectra from the FOCES spectragraph at the DSAZ telescope. Line-formation calculations of SiI and SiII in the atmospheres of nearby metal-poor stars are presented. All abundance results are derived from local thermodynamic equilibrium (LTE) and NLTE statistical equilibrium calculations and spectrum synthesis methods. We find that NLTE effects for SiII optical lines are important for warm stars, and that they depend on effective temperature. The Si abundances of thin and thick disc stars follow distinct trends, as in the case of Mg. We find that [Si/Fe] gradually increases as [Fe/H] decreases in thin disc stars, while it remains around at ~+0.30dex for halo and thick disc stars, the halo stars showing larger scatter. The derived dependence between [Si/Fe] and [Fe/H] is inconsistent with the theoretical predictions of published model calculations for the chemical evolution of the Galaxy. The nearly constant [Si/Mg] ratio with some scatter for halo and thick disc stars suggests that the nucleosynthesis of silicon is closely coupled to that of Mg. In addition, our results do not support the suggestion that type Ia supernove produce significant amounts of silicon.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: late-type - line: profiles - line: formation - Galaxy: evolution

Simbad objects: 67

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Number of rows : 67
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 * 85 Peg SB* 00 02 10.3411392575 +27 04 54.476788744 6.47 6.42 5.75 5.16 4.73 G5VbFe-2 532 0
2 BD+30 89 PM* 00 38 47.4607754368 +31 01 08.935848090   9.67   8.6   G0 32 0
3 HD 17948 PM* 02 55 56.9207493120 +61 31 16.097176885   6.001 5.584     F5V 88 0
4 HD 22309 PM* 03 36 03.1584493309 +16 28 02.891319613 8.250 8.230   7.3   G0 61 0
5 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 451 0
6 HD 30649 PM* 04 51 43.5714471304 +45 50 02.842355226 7.59 7.55 6.97 6.45 6.10 G2 218 0
7 HD 241253 PM* 05 09 56.9590196910 +05 33 26.743378965   10.24   9.4   G0 89 0
8 HD 243357 PM* 05 25 27.9844571193 +32 24 41.292408513   10.36   9.4   G2 38 0
9 HD 36283 PM* 05 31 13.7776106070 +15 46 24.430398713   9.31   8.2   G4 63 0
10 HD 246067 PM* 05 39 27.4340740248 +03 57 02.685222706       9.9   G0 51 0
11 HD 250792 ** 06 03 14.8634898007 +19 21 38.692248180 9.89 9.898 9.310 8.954 8.547 G1 152 0
12 HD 46341 PM* 06 32 37.9911853832 -06 29 18.503591738   9.16 8.60     G2V 71 0
13 HD 56513 PM* 07 18 28.8690667342 +27 15 10.271357590   8.70   7.6   G2V 56 0
14 HD 58551 PM* 07 26 50.2564112797 +21 32 08.348615001   7.00   6.3   F6V 124 0
15 HD 59374 PM* 07 30 29.0167349664 +18 57 40.617055091   9.03   8.2   F9 109 0
16 HD 59984 PM* 07 32 05.7631181661 -08 52 52.773345653   6.431 5.916     G0VFe-1.6CH-0.5 194 0
17 HD 60319 PM* 07 34 35.1080318077 +16 54 04.031855106   9.46   8.6   F8 88 0
18 HD 233511 PM* 08 19 22.5717671718 +54 05 09.627780721 10.02 10.24   9.4   F4 127 0
19 BD+65 737 PM* 09 49 42.8200461811 +65 18 15.035108186   10.35   9.2   G3 42 0
20 HD 88446 PM* 10 12 19.0773304082 +17 17 57.051756021   8.40   7.5   G0V 108 0
21 HD 88725 PM* 10 14 08.3345668419 +03 09 04.675865338 8.34 8.33 7.73 7.24 6.89 G3/5V 177 0
22 HD 298986 PM* 10 17 14.8775103392 -52 29 18.691601582   10.46 10.03   9.48 F5 76 0
23 HD 91784 PM* 10 36 10.8494556138 +15 52 18.966615663   9.70   8.7   G0 31 0
24 BD+29 2091 PM* 10 47 23.1625623007 +28 23 55.928286438   10.72   10.1   F5 130 0
25 HD 94028 PM* 10 51 28.1254469804 +20 16 38.965521484 8.51 8.69 8.22 7.82 7.54 F8 340 0
26 * 51 LMi PM* 11 05 15.4745795131 +25 12 06.856879744   8.18   7.2   G0 75 0
27 HD 97855 PM* 11 16 04.0347215547 +52 46 23.386381656       6.2   F6VgF6mF3 90 0
28 BD+20 2594 PM* 11 23 16.2308862209 +19 53 37.665333745   10.51   9.6   F9 70 0
29 HD 101177 ** 11 38 44.90018 +45 06 30.3054 7.05 7.00   6.1   G0V+K2V 151 0
30 HD 104056 PM* 11 59 03.0838158008 -04 46 38.936919475   9.58 9.01     G3V 52 0
31 HD 107582 SB* 12 21 28.1422728947 +61 44 50.169472993   8.81   7.9   G3 75 0
32 HD 108076 PM* 12 24 45.8892348867 +38 19 07.461955799   8.58   7.7   G0V 104 0
33 HD 114606 PM* 13 11 21.4029562561 +09 37 33.539749216 9.41 9.34 8.72 8.18 7.81 G4 119 0
34 HD 118659 PM* 13 38 00.4712954269 +19 08 53.098367002 9.58 9.47   8.4   G4V 84 0
35 HD 119288 PM* 13 42 12.7607173974 +08 23 18.227521395   6.58   5.9   F2V 112 0
36 HD 122196 PM* 14 01 02.1244272306 -38 03 03.297565043   9.19 8.75     F0(V)w 111 0
37 HD 123710 PM* 14 04 57.0712635984 +74 34 24.892571708   8.79   7.8   G5 63 0
38 HD 126512 PM* 14 25 30.1203516561 +20 35 24.574602350   7.89   6.9   G0 106 0
39 * sig Boo PM* 14 34 40.8171808483 +29 44 42.463685978 4.76 4.84 4.47 4.13 3.94 F4VkF2mF1 581 0
40 HD 134169 SB* 15 08 18.0562462154 +03 55 50.107808860 8.14 8.22 7.70     F7V 201 0
41 * 39 Ser SB* 15 53 12.0969759597 +13 11 47.842699872 6.72 6.71 6.12 5.58 5.23 G1VFe-1 182 0
42 HD 144061 PM* 15 58 21.0287423547 +70 53 39.979166768   7.903 7.280 8.00   G2V 57 0
43 HD 148816 PM* 16 30 28.4586643435 +04 10 41.603810207 7.75 7.81 7.28 6.82 6.49 F7V 290 0
44 HD 149996 PM* 16 38 17.3888629905 -02 26 31.814238231   9.10 8.49     G1V 80 0
45 BD+68 901 PM* 16 56 24.1550840418 +68 01 30.582100587   9.39   8.2   G0 34 0
46 HD 157089 PM* 17 21 07.0567914512 +01 26 34.981760941 7.60 7.59 7.01 6.46 6.14 F8VgF8mF6 238 0
47 HD 157466 PM* 17 22 27.6461103752 +24 52 45.934455673       6.6   F8V 114 0
48 HD 158226 PM* 17 26 43.1970011642 +31 04 37.894858895   9.09   8.1   G1V 106 0
49 HD 160933 SB* 17 36 40.0076252402 +69 34 14.778898265   7.00   6.0   F9IV-V 87 0
50 BD+18 3423 PM* 17 38 15.6095483986 +18 33 25.484101675 10.17 10.27   9.4   F6V 120 0
51 HD 160693 PM* 17 39 36.8721114627 +37 11 01.504427710 8.94 8.92   8.0   G0 197 0
52 HD 170357 PM* 18 26 37.7259243207 +46 05 01.601435002   8.93   7.9   G1V 49 0
53 HD 171620 PM* 18 34 30.6939438450 +34 24 56.295150285   8.06   7.2   F6p 74 0
54 HD 230473 PM* 19 01 51.0139782620 +16 03 48.400759029   10.997 10.378 9.977 9.592 G0 27 0
55 * 3 Cyg ** 19 25 25.7580116416 +24 54 45.988319672   6.70   5.9   F8 93 0
56 HD 184448 PM* 19 32 02.5281551739 +50 10 53.559251885   8.69   7.7   F8 60 0
57 HD 186379 PM* 19 43 07.0300235292 +24 35 52.584762528   7.41   6.5   F8V 83 0
58 HD 198300 PM* 20 46 35.4771023291 +59 51 09.478640179   9.30 8.96 8.84   G0 46 0
59 HD 200580 SB* 21 04 07.4073421467 +02 59 40.012308707 7.82 7.85   7.0   F9V 158 0
60 HD 201889 ** 21 11 59.52350 +24 10 05.3897 8.60 8.64 8.05 7.52 7.15 G1V 151 0
61 HD 204155 PM* 21 26 42.9051661431 +05 26 29.899070605   9.03   8.1   F7V 121 0
62 BD+26 4251 PM* 21 43 57.1238901563 +27 23 23.991146537       9.9   F6 78 0
63 HD 208906 PM* 21 58 40.8319509283 +29 48 45.457435407 7.35 7.47 6.96 6.53 6.22 G0VmF2 165 0
64 BD+75 839 ** 22 35 52.6308240770 +76 29 32.568422416       9.1   G0wl 40 0
65 HD 215257 PM* 22 43 50.7183139841 +03 53 12.629544211   7.93   7.1   F5V 140 0
66 HD 218209 PM* 23 05 06.0911806521 +68 25 01.432968207 8.21 8.13 7.48 6.94 6.57 G8 126 0
67 HD 221876 PM* 23 35 42.5403143632 +20 34 50.333144438   9.66   8.8   G2 45 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-12:31:49

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