2006A&A...458..899F


Query : 2006A&A...458..899F

2006A&A...458..899F - Astronomy and Astrophysics, volume 458, 899-914 (2006/11-2)

The non-LTE line formation of neutral carbon in late-type stars.

FABBIAN D., ASPLUND M., CARLSSON M. and KISELMAN D.

Abstract (from CDS):

We investigate the non-Local Thermodynamic Equilibrium (non-LTE) line formation of neutral carbon in late-type stars in order to remove some of the potential systematic errors in stellar abundance analyses employing Ci features. The statistical equilibrium code MULTI was used on a grid of plane-parallel 1D MARCS atmospheric models. Within the parameter space explored, the high-excitation Ci lines studied are stronger in non-LTE due to the combined effect of line source function drop and increased line opacity due to overpopulation of the lower level for the transitions considered; the relative importance of the two effects depends on the particular combination of Teff, log g, [Fe/H] and [C/Fe] and on the analysed Ci line. As a consequence, the non-LTE abundance corrections are negative and can be substantially so, for example ~-0.4dex in halo turn-off stars at [Fe/H]~-3. The magnitude of the non-LTE corrections is rather insensitive to whether inelastic H collisions are included or not. Our results have implications on studies of nucleosynthetic processes and on Galactic chemical evolution models. When applying our calculated corrections to recent observational data, the upturn in [C/O] at low metallicity might still be present (thus apparently still necessitating contributions from massive Pop. III stars for the carbon production), but at a lower level and possibly with a rather shallow trend of ~-0.2dex/dex below [O/H]~-1.

Abstract Copyright:

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

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1825 0
2 Ross 892 PM* 10 27 24.2460060626 +01 24 00.190284079   11.55   10.8   sdF8 65 0
3 BD-13 3442 Pe* 11 46 50.6525751264 -14 06 43.458063768   10.662 10.274     CEMP 100 0
4 HD 103723 PM* 11 56 36.0251513496 -21 25 09.829610868   10.554 10.091     F5/6V 75 0
5 HD 105004 PM* 12 05 24.8526164337 -26 35 43.750181317   10.96 10.39     F9 101 0
6 BD-04 3208 PM* 12 07 15.0721580835 -05 44 01.612773628   10.40 9.99     A7 141 0
7 Ross 453 PM* 12 10 55.7733238889 +00 23 54.332076195   11.53   10.9   F2 105 0
8 HD 106038 PM* 12 12 01.3688687080 +13 15 40.618559661 10.45 10.630 10.162 9.851 9.539 F6wl 181 0
9 HD 108177 PM* 12 25 34.9568267745 +01 17 02.259553591 9.87 10.09 9.66 9.21 8.89 F0V 243 0
10 HD 110621 PM* 12 43 43.2215753256 -44 40 31.562765508   10.34 9.92     Fpw 73 0
11 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 273 0
12 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 143 0
13 Ross 841 Pe* 14 02 30.0900761861 -05 39 05.181979951   11.508 11.149 10.866 10.576 sdA3 147 0
14 Wolf 550 SB* 14 50 07.8032346714 +00 50 27.127840325   11.47   10.8   sd:F5 76 0
15 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 893 0
16 BD+08 3095 PM* 15 50 58.9334638272 +08 25 23.721884040   10.60   9.8   G2 79 0
17 HD 146296 PM* 16 21 11.3151618845 -71 17 13.024312315   10.37 9.77     G3V 45 0
18 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 297 0
19 BD+02 3375 PM* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 191 0
20 HD 160617 PM* 17 42 49.3234249010 -40 19 15.503834657   9.18 8.73 8.394 8.065 G0 194 0
21 HD 179626 PM* 19 13 20.7189797919 -00 35 42.325251766   9.701 9.187 8.844 8.489 F5V 123 0
22 HD 181743 PM* 19 23 42.7454702782 -45 04 56.914961207   10.13 9.71     F4 103 0
23 CD-42 14278 PM* 19 32 19.1474936380 -42 12 43.711761026   10.76 10.29     F5Vwl 36 0
24 HD 188031 PM* 19 54 58.6573602356 -42 38 43.395207211   10.54 10.17     F0V 63 0
25 G 24-3 Pe* 20 05 44.3170407024 +04 02 52.812418452   10.92   10.2   sdF8 88 0
26 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 270 0
27 HD 340279 PM* 20 24 45.4125969504 +25 03 07.109969040   11.23   10.7   A5 99 0
28 HD 194598 PM* 20 26 11.9183775668 +09 27 00.429558608 8.62 8.82 8.34 7.90 7.56 F8 293 0
29 LP 815-43 PM* 20 38 13.2998605176 -20 26 10.850795808   11.31 10.72     ~ 74 0
30 CD-30 18140 PM* 20 44 06.2872647830 -30 00 07.597192977   10.326 9.932     F8 85 0
31 CD-35 14849 PM* 21 33 49.7524989129 -35 26 14.228198341   10.95 10.56 10.59   B8 70 0
32 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 553 0
33 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 107 0
34 HD 215801 PM* 22 48 29.4254660444 -46 03 50.538724185   10.46 10.05     F0w 62 0
35 BD+02 4651 PM* 23 19 40.4500387773 +03 22 16.694733495   10.67   9.9   sdF6 107 0

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2022.08.10-07:24:54

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