2000ApJ...541..207I

Query : 2000ApJ...541..207I

2000ApJ...541..207I - Astrophys. J., 541, 207-217 (2000/September-3)

Non-LTE abundances and consequences for the evolution of the α-elements in the Galaxy.

IDIART T. and THEVENIN F.

Abstract (from CDS):

Abundances of α-elements such as Ca and Mg in disk and halo stars are usually derived from equivalent width lines measured on high-resolution spectra and assuming local thermodynamic equilibrium (LTE). In this paper, we present non-LTE differential abundances derived by computing the statistical equilibrium of Ca I and Mg I atoms, using high-resolution equivalent widths available in the literature for 252 dwarf to subgiant stars. These non-LTE abundances, combined with recent determination of non-LTE abundances of iron, seem to remove the dispersion of the [Ca/Fe] and [Mg/Fe] ratios in the galactic halo and disk phases, revealing new and surprising structures. These results have important consequences for chemical evolution models of the Galaxy. In addition, non-LTE abundance ratios for stars belonging to the M92 cluster apparently have the same behavior. More high-resolution observations, mainly of globular clusters, are urgently needed to confirm our results.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Abundances - Radiative Transfer - Stars: Abundances - Stars: Atmospheres

CDS comments: Table 3 : Stars M92-NNN are Cl* NGC 6341 SH ..., W 7547 = GCRV 7547, LR 740 (misprint for R 740?) = Ross 740

Simbad objects: 71

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Number of rows : 71
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 3567 PM* 00 38 31.9473242153 -08 18 33.392826667 9.54 9.70 9.23     F7/8wF3 221 0
2 * mu. Cas SB* 01 08 16.3029454473 +54 55 12.561201263 5.93 5.86 5.17 4.55 4.13 G5Vb 593 1
3 CD-61 282 PM* 01 36 05.8495294416 -61 05 03.492150337   10.63 10.10     G0 74 0
4 HD 16031 PM* 02 34 11.0485653360 -12 23 03.444110700 9.99 10.21 9.77     F0V 179 1
5 HD 17288 PM* 02 44 09.9878586597 -60 03 21.799320430   10.557 10.214 10.000   F7V 57 0
6 HD 17820 PM* 02 51 58.3551725257 +11 22 11.940361848 8.85 8.92   8.0   G5 123 0
7 LP 831-70 PM* 03 06 05.4386096664 -22 19 17.828964660   12.043 11.608 11.598   ~ 52 0
8 HD 19445 Pe* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 801 0
9 BD+20 571 Pe* 03 27 39.4522217875 +21 02 34.994793492   11.36   10.8   G0 67 0
10 CD-47 1087 PM* 03 34 44.4683802912 -47 16 12.058432860   10.83 10.26     G8V-VI 40 0
11 HD 22879 Pe* 03 40 22.0652879951 -03 13 01.124265616 7.146 7.222 6.667 6.346 6.016 G0VmF2 529 0
12 HD 24339 PM* 03 51 24.1360373910 -25 55 57.378422899   10.00 9.44     F7V 49 1
13 HD 25704 ** 04 01 44.6317980946 -57 12 24.598726799   8.65 8.10     F7V 161 0
14 L 56-75 Pe* 04 27 35.3251844232 -74 10 45.161208804   12.00 11.54     ~ 22 0
15 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17 9.7 9.6   sdF0 182 0
16 HD 241253 PM* 05 09 56.9589768600 +05 33 26.741302308   10.24   9.4   G0 104 0
17 HD 34328 Pe* 05 13 05.2760918664 -59 38 44.265435029   9.95 9.5     G0wA8V 140 0
18 HD 246132 SB* 05 40 09.7460841768 +12 10 41.058951312       9.8   G5 77 0
19 HD 48565 SB* 06 44 54.9126657408 +20 51 38.338708500   7.746 7.183     hF8gF8mF3 83 0
20 CD-33 3337 PM* 06 54 47.8101117384 -33 44 49.024262364   9.56 9.03     F5 103 0
21 CD-57 1633 HV* 07 06 28.9516977109 -57 27 29.118927115   10.04 9.54     F7V 114 0
22 HD 59392 Pe* 07 28 03.2212916981 -38 00 41.278587469   10.17 9.7     F0V 102 0
23 CD-45 3283 PM* 07 34 18.5993129322 -45 16 42.883606401   11.08 10.43     G8V-VI 88 0
24 HD 60319 PM* 07 34 35.1077496408 +16 54 04.028098500   9.46   8.6   F8 108 0
25 HD 64090 Pe* 07 53 33.1208795337 +30 36 18.256204963 8.75 8.86 8.25 7.70 7.30 K0:V_Fe-3 374 0
26 BD+80 245 Pe* 08 11 06.2398198478 +79 54 29.556322137   10.50 9.96 9.88   G0 123 0
27 HD 74000 Pe* 08 40 50.8036114756 -16 20 42.516208237 9.84 10.09 9.66     F2 279 0
28 HD 76932 PM* 08 58 43.9327642391 -16 07 57.817644364 6.47 6.39 5.86     G2VFe-1.8CH-1 426 0
29 G 46-31 SB* 09 17 04.0007462520 +03 01 29.610961464   11.359 10.897 10.704   ~ 72 0
30 HD 83220 * 09 35 16.7014529712 -49 07 48.938147472   8.91 8.56     F2/3V 72 0
31 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 831 0
32 HD 94028 PM* 10 51 28.1256073369 +20 16 38.965439278 8.51 8.69 8.22 7.82 7.54 F8 375 0
33 LP 732-48 Pe* 11 13 03.4726279224 -12 48 02.256747048   12.879 12.499 12.224 11.914 ~ 24 0
34 HD 97916 SB* 11 15 54.2294766960 +02 05 12.089062104 9.50 9.61   8.9   F5.5VgF2.5kF2:mA6 178 0
35 HD 99383 Pe* 11 25 49.8351777360 -38 52 16.936102452   9.56 9.08     F2V 85 0
36 BD-13 3442 Pe* 11 46 50.6525751264 -14 06 43.458063768   10.662 10.274     CEMP 117 0
37 HD 103095 Pe* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 842 1
38 BD-21 3420 PM* 11 55 28.4581009368 -22 23 13.324840296   10.649 10.107     F5 74 0
39 HD 103723 PM* 11 56 36.0251513496 -21 25 09.829610868   10.554 10.091     F5/6V 87 0
40 HD 105004 PM* 12 05 24.8526164337 -26 35 43.750181317   10.96 10.39     F9 117 0
41 HD 106038 PM* 12 12 01.3688687080 +13 15 40.618559661 10.45 10.630 10.162 9.851 9.539 F6wl 204 0
42 HD 108177 PM* 12 25 34.9568267745 +01 17 02.259553591 9.87 10.09 9.66 9.21 8.89 F0V 266 0
43 CD-39 7674 * 12 32 28.7989749192 -40 05 54.666366468   11.5 11.1     F6 37 0
44 HD 113083 SB* 13 01 26.2705909615 -27 22 28.312946309   8.58 8.05     G1V 107 0
45 HD 113679 PM* 13 05 52.8245053407 -38 30 59.990193435   10.342 9.797     G2/3V 114 0
46 HD 116064 Pe* 13 21 43.7779908364 -39 18 40.025179966   9.26 8.8     F9IV-Vm-5 137 0
47 HD 120559 SB* 13 51 40.3987847839 -57 26 08.350982731 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 168 0
48 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 164 0
49 BD+34 2476 PM* 13 59 09.4837849799 +33 51 39.379962282 10.25 10.44   9.7   sdF5 167 0
50 HD 126681 PM* 14 27 24.9094012952 -18 24 40.454425566   9.939 9.535     G3V 208 0
51 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 985 0
52 CD-71 1234 Pe* 16 07 44.6410532021 -71 21 01.360284611   10.81 10.44     ~ 44 0
53 HD 147609 SB* 16 21 51.9907270896 +27 22 27.247560924   9.69 9.18     G5 29 0
54 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
55 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 205 0
56 HD 160617 Pe* 17 42 49.3234249010 -40 19 15.503834657   9.18 8.7 8.394 8.065 G0 220 0
57 BD+20 3603 Pe* 17 54 43.2306198848 +20 16 16.444611703   10.13 9.8 9.6   F0 169 0
58 HD 166913 PM* 18 16 25.6832938176 -59 24 11.239435980   8.66 8.23     F5/7Vw 142 0
59 HD 181743 PM* 19 23 42.7454702782 -45 04 56.914961207   10.13 9.71     F4 109 0
60 HD 338529 PM* 19 32 31.9104668184 +26 23 26.117367216   9.72   9.2   B5 213 0
61 Ross 740 PM* 19 35 36.3818163604 -04 10 15.166705841   13.434 12.736 12.259 11.772 G0wl 20 0
62 LP 635-14 Pe* 20 26 46.8302881512 -00 37 15.175129512 11.57 11.76 11.33     OB- 45 0
63 LP 815-43 Pe* 20 38 13.2998605176 -20 26 10.850795808   11.31 10.72     ~ 82 0
64 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 580 0
65 HD 213657 PM* 22 33 47.0565175200 -42 03 13.790346516   10.08 9.66     (G0)w(A) 96 0
66 Cl* NGC 6341 SH 60 * ~ ~   18.48 18.02     ~ 5 0
67 Cl* NGC 6341 SH 34 * ~ ~   18.46 17.95     ~ 6 0
68 Cl* NGC 6341 SH 18 * ~ ~   18.46 17.98     ~ 11 0
69 Cl* NGC 6341 SH 350 * ~ ~   18.49 18.00     ~ 6 0
70 Cl* NGC 6341 SH 21 * ~ ~   18.45 17.94     ~ 9 0
71 Cl* NGC 6341 SH 46 * ~ ~   18.52 18.04     ~ 9 0

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