2018MNRAS.481.2666G

Query : 2018MNRAS.481.2666G

2018MNRAS.481.2666G - Mon. Not. R. Astron. Soc., 481, 2666-2684 (2018/December-1)

The GALAH survey: verifying abundance trends in the open cluster M67 using non-LTE modelling.

GAO X., LIND K., AMARSI A.M., BUDER S., DOTTER A., NORDLANDER T., ASPLUND M., BLAND-HAWTHORN J., DE SILVA G.M., D'ORAZI V., FREEMAN K.C., KOS J., LEWIS G.F., LIN J., MARTELL S.L., SCHLESINGER K.J., SHARMA S., SIMPSON J.D., ZUCKER D.B., ZWITTER T., DA COSTA G., ANGUIANO B., HORNER J., HYDE E.A., KAFLE P.R., NATAF D.M., REID W., STELLO D., TING Y.-S. (The GALAH Collaboration)

Abstract (from CDS):

Open cluster members are coeval and share the same initial bulk chemical composition. Consequently, differences in surface abundances between members of a cluster that are at different evolutionary stages can be used to study the effects of mixing and internal chemical processing. We carry out an abundance analysis of seven elements (Li, O, Na, Mg, Al, Si, and Fe) in 66 stars belonging to the open cluster M67, based on high resolution GALAH spectra, 1D MARCS model atmospheres, and non-local thermodynamic equilibrium (non-LTE) radiative transfer. From the non-LTE analysis, we find a typical star-to-star scatter in the abundance ratios of around 0.05 dex. We find trends in the abundance ratios with effective temperature, indicating systematic differences in the surface abundances between turn-off and giant stars; these trends are more pronounced when LTE is assumed. However, trends with effective temperature remain significant for Al and Si also in non-LTE. Finally, we compare the derived abundances with prediction from stellar evolution models including effects of atomic diffusion. We find overall good agreement for the abundance patterns of dwarfs and sub-giant stars, but the abundances of cool giants are lower relative to less evolved stars than predicted by the diffusion models, in particular for Mg.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiative transfer - stars: abundances - stars: atmospheres - stars: late-type

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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 Cl* NGC 2682 SAND 95 Em* 08 48 56.2274604720 +11 08 32.630757108   12.39 12.44     ~ 7 0
3 Cl* NGC 2682 SAND 755 * 08 50 47.6006876448 +11 45 22.899677940 14.498 14.48 13.921   13.235 G0V 25 0
4 NGC 2682 15 * 08 50 47.6645194702 +11 47 52.631234008 14.144 14.15 13.632   12.920 G0V 26 0
5 Cl* NGC 2682 SAND 805 * 08 50 49.7623401024 +11 54 24.391427328 14.668 14.64 14.055   13.368 ~ 21 0
6 NGC 2682 20 Pe* 08 50 49.9469249705 +11 49 12.771453264 14.186 13.78 12.889   11.998 G8V 79 0
7 NGC 2682 27 * 08 50 53.4433915732 +11 44 34.676078330 14.439 14.3 13.606   12.865 G4V 45 0
8 NGC 2682 28 SB* 08 50 54.3947168904 +11 56 29.078294820 13.385 13.32 12.761     F8IV 52 0
9 Cl* NGC 2682 SAND 784 * 08 50 54.7387354704 +11 51 09.375806268 14.163 14.12 13.551   12.885 F9V 27 0
10 NGC 2682 30 * 08 50 55.6925064870 +11 52 14.690654736   12.64 11.954   11.369 F9IV 55 0
11 NGC 2682 31 * 08 50 56.0068821744 +11 53 51.983307924 14.289 14.205 13.634 13.586 12.986 F8V 36 0
12 Cl* NGC 2682 SAND 809 * 08 50 57.6200257056 +11 55 14.698943796 14.052 13.98 13.368   12.727 F7V 37 0
13 NGC 2682 37 RB? 08 50 58.1579169528 +11 52 22.369391242 14.489 13.8 12.806   11.881 K0IV 81 0
14 NGC 2682 44 V* 08 50 59.7259991607 +11 39 52.538680279 13.598 13.59 13.053   12.389 F9V 40 0
15 NGC 2682 46 Pe* 08 51 00.1768051728 +11 54 32.104231704 13.991 13.541 12.764   11.889 G5IV 59 0
16 NGC 2682 48 RB? 08 51 01.0583959920 +11 50 10.912564680 13.781 13.47 12.699   11.895 G2IV 51 0
17 NGC 2682 52 * 08 51 01.5594485424 +11 47 50.212536864 14.237 14.09 13.515   12.802 G1V 43 0
18 NGC 2682 54 Pe* 08 51 03.2565549432 +11 45 47.409871217 13.451 13.268 12.628   11.955 G0IV 65 0
19 Cl* NGC 2682 SAND 796 * 08 51 04.9241356824 +11 52 26.169599028 14.530 14.43 13.885   13.146 G0V 25 0
20 NGC 2682 72 RG* 08 51 08.3845013448 +11 47 12.146447796   13.39 12.315     F0V 95 0
21 NGC 2682 73 * 08 51 08.5682228256 +11 50 53.061379440 14.471 14.39 13.779 13.450 13.096 G0V 42 0
22 NGC 2682 80 * 08 51 11.6426334874 +11 48 50.594563303 14.473 14.37 13.799   13.078 G1V 37 0
23 NGC 2682 84 HB* 08 51 12.6931158192 +11 52 42.446745336   11.629 10.393 10.234 9.500 K1III 152 0
24 NGC 2682 91 * 08 51 14.7601182624 +11 47 24.021041964 13.454 13.38 12.823   12.145 F8V 43 0
25 NGC 2682 94 * 08 51 15.3440890008 +11 50 14.357582736 13.469 13.38 12.788   12.143 F8: 57 0
26 NGC 2682 36 RB? 08 51 15.6379167000 +11 50 56.225142420 14.310 13.87 13.015   12.10 G9V 51 0
27 NGC 2682 104 RG* 08 51 17.0400668664 +11 50 46.501856052   12.114 11.001 10.863 10.12 K0III/IV 97 0
28 NGC 2682 112 * 08 51 18.1013398368 +11 42 54.764267832 13.929 13.86 13.282   12.594 G0V 47 0
29 NGC 2682 114 * 08 51 18.3364820376 +11 43 25.200600708 14.013 13.97 13.399   12.720 F9V 42 0
30 NGC 2682 115 Pe* 08 51 18.5413189200 +11 49 21.513324180 13.309 13.26 12.645 12.274 11.924 F9IV 103 0
31 Cl* NGC 2682 ES IV-96 RG* 08 51 18.9732499896 +11 58 11.037897372 13.989 13.30 12.272     ~ 59 0
32 NGC 2682 125 * 08 51 20.1572791392 +11 52 48.018858132 14.533 14.44 13.913   13.179 ~ 51 0
33 NGC 2682 132 * 08 51 20.8050295680 +11 45 02.509780428 13.812 13.71 13.110   12.38 G: 67 0
34 NGC 2682 135 RG* 08 51 21.5640702312 +11 46 06.216394188   12.53 11.394   10.39 K1III 122 0
35 NGC 2682 140 Ro* 08 51 22.0511842656 +11 46 41.010219552 13.811 13.797 13.189 12.834 12.496 ~ 87 0
36 NGC 2682 141 HB* 08 51 22.8036640800 +11 48 01.779545736   11.570 10.346 10.180 9.40 K0IIIb 167 0
37 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
38 NGC 2682 148 * 08 51 25.5222059040 +11 52 38.833392252   13.88 13.284   12.564 F9IV 29 0
39 NGC 2682 150 * 08 51 25.9532377776 +11 49 08.962426416 13.825 13.8 13.280 12.893 12.545 F9V 34 0
40 NGC 2682 151 RG* 08 51 26.1833544456 +11 53 51.981683748   11.58 10.391     K1III 124 0
41 NGC 2682 157 * 08 51 27.4210421592 +11 53 26.584982808   13.35 12.763   12.069 F8 53 0
42 NGC 2682 162 * 08 51 28.3019873256 +11 52 17.533993836   13.4 12.850   12.127 F8 37 0
43 NGC 2682 164 RG* 08 51 28.9910274072 +11 50 33.127331784   11.675 10.441 10.250 9.46 K1III 162 0
44 NGC 2682 166 Pe* 08 51 29.3544247680 +11 45 27.647071884 14.413 13.85 12.910   11.962 K0IV 83 0
45 NGC 2682 171 * 08 51 30.1308913504 +11 43 49.888057481 13.787 13.75 13.136   12.436 F9V 50 0
46 NGC 2682 175 * 08 51 31.1963113608 +11 53 18.003022152 14.330 14.31 13.844   13.014 ~ 52 0
47 NGC 2682 192 Pe* 08 51 35.4048721128 +11 57 56.554444188 13.879 13.583 12.817     G2IV 59 0
48 NGC 2682 193 RG* 08 51 35.7789056016 +11 53 34.748492712 13.904 13.22 12.267   11.228 K0III 121 0
49 NGC 2682 195 SB* 08 51 36.0102891818 +11 46 33.602537041 13.539 13.4 12.682 12.328 11.915 G0 64 0
50 Cl* NGC 2682 SAND 1320 * 08 51 37.5784170984 +11 56 44.587539240 15.267 15.06 14.482   13.684 F9 42 0
51 NGC 2682 210 * 08 51 39.2311504440 +11 50 03.851908944 12.866 12.79 12.277   11.566 F8V 51 0
52 NGC 2682 214 * 08 51 40.8169654272 +11 49 05.600614044 14.407 14.35 13.885   13.137 G0V 39 0
53 NGC 2682 215 Pe* 08 51 41.2290418776 +11 54 29.071239876 13.350 13.34 12.836   12.143 F8IV 61 0
54 NGC 2682 218 RG* 08 51 42.3411424776 +11 50 07.677862008   12.71 11.48     K1III 84 0
55 NGC 2682 217 RG* 08 51 42.3635843520 +11 51 23.075134668   12.80 11.23     K1III 101 0
56 NGC 2682 223 RG* 08 51 43.8874792752 +11 56 42.528745068   11.658 10.476   9.500 K1III 114 0
57 NGC 2682 228 Em* 08 51 44.6531438448 +11 41 51.065427948 13.802 13.77 13.215   12.524 F8V 43 0
58 Cl* NGC 2682 SAND 1202 V* 08 51 44.9278658205 +11 38 58.975391846 14.104 14.07 13.630 13.460 12.807 F9V 41 0
59 NGC 2682 231 RG* 08 51 45.0772293264 +11 47 45.971197080   12.57 11.468     K1III 127 0
60 Cl* NGC 2682 SAND 1321 * 08 51 45.2193594264 +11 56 55.352374692 14.181 14.10 13.651     ~ 24 0
61 NGC 2682 233 * 08 51 45.9689615784 +11 44 09.366892764 13.969 13.94 13.427   12.723 F5V 39 0
62 NGC 2682 235 * 08 51 46.4157683952 +11 46 26.717955492 13.989 13.95 13.463   12.694 F8V 38 0
63 NGC 2682 237 * 08 51 48.8385365448 +11 56 51.245718540 14.453 13.82 12.982     K0IV 49 0
64 NGC 2682 241 * 08 51 49.1427101712 +11 49 43.607392284 13.385 13.31 12.759   12.025 F8IV 37 0
65 NGC 2682 262 RB? 08 51 56.1167034360 +11 50 14.841071664 14.595 13.9 12.976   11.906 K0IV 53 0
66 NGC 2682 266 RG* 08 51 59.5227693496 +11 55 04.835590251   11.65 10.463   9.490 K1III 113 0
67 NGC 2682 267 Em* 08 51 59.6372211192 +11 52 57.679412484 13.454 13.37 12.878   12.115 ~ 37 0
68 Cl* NGC 2682 SAND 1486 * 08 52 03.3045061800 +11 58 04.640004912   14.57 14.097   13.286 ~ 31 0
69 Cl* NGC 2682 SAND 1464 * 08 52 07.4180971512 +11 50 22.161528852 13.899 13.85 13.308   12.521 ~ 36 0
70 Cl* NGC 2682 SAND 1461 * 08 52 07.8596461848 +11 49 49.986268680 14.483 14.45 13.998   13.146 F7V 24 0
71 NGC 2682 281 V* 08 52 11.3482966608 +11 45 37.976349384 14.016 13.734 12.951   12.019 G5IV 52 0

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