2020A&A...640A..81N


Query : 2020A&A...640A..81N

2020A&A...640A..81N - Astronomy and Astrophysics, volume 640A, 81-81 (2020/8-1)

High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations.

NISSEN P.E., CHRISTENSEN-DALSGAARD J., MOSUMGAARD J.R., SILVA AGUIRRE V., SPITONI E. and VERMA K.

Abstract (from CDS):


Aims. Previous high-precision studies of abundances of elements in solar twin stars are extended to a wider metallicity range to see how the trends of element ratios with stellar age depend on [Fe/H].
Methods. HARPS spectra with signal-to-noise ratios S/N≥600 at λ∼6000Å were analysed with MARCS model atmospheres to obtain 1D LTE abundances of C, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Sr, and Y for 72 nearby solar-type stars with metallicities in the range of -0.3≤[Fe/H]≤+0.3 and ASTEC stellar models were used to determine stellar ages from effective temperatures, luminosities obtained via Gaia DR2 parallaxes, and heavy element abundances.
Results. The age-metallicity distribution appears to consist of the following two distinct populations: a sequence of old stars with a steep rise of [Fe/H] to ~+0.3dex at an age of ∼7Gyr and a younger sequence with [Fe/H] increasing from about -0.3dex to ~+0.2dex over the last 6Gyr. Furthermore, the trends of several abundance ratios, [O/Fe], [Na/Fe], [Ca/Fe], and [Ni/Fe], as a function of stellar age, split into two corresponding sequences. The [Y/Mg]-age relation, on the other hand, shows no offset between the two age sequences and has no significant dependence on [Fe/H], but the components of a visual binary star, ζ Reticuli, have a large and puzzling deviation.
Conclusions. The split of the age-metallicity distribution into two sequences may be interpreted as evidence of two episodes of accretion of gas onto the Galactic disk with a quenching of star formation in between. Some of the [X/Fe]-age relations support this scenario but other relations are not so easy to explain, which calls for a deeper study of systematic errors in the derived abundances as a function of [Fe/H], in particular 3D non-LTE effects.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: solar-type - stars: fundamental parameters - stars: abundances - Galaxy: disk - Galaxy: evolution

VizieR on-line data: <Available at CDS (J/A+A/640/A81): table1.dat table2.dat>

Simbad objects: 74

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Number of rows : 74
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 HD 361 * 00 08 16.3616321400 -14 49 28.168322232   7.65 7.03     G1V 67 0
2 HD 1461 PM* 00 18 41.8676757921 -08 03 10.803829898   7.14 6.46     G3VFe0.5 345 1
3 HD 2071 PM* 00 24 42.5482773168 -53 59 02.393720124   7.95 7.27     G2V 82 0
4 HD 4915 PM* 00 51 10.8478903584 -05 02 21.401155212 7.792 7.643 6.972 6.604 6.252 G5V 122 0
5 HD 6204 * 01 02 57.4203939192 -09 51 40.459854636   9.17 8.53     G3V 42 0
6 HD 7134 PM* 01 11 32.0804113824 -12 50 35.095507764   8.05 7.48     G1V 61 0
7 HD 8406 PM* 01 23 00.8737980552 -16 29 14.860982832   8.58 7.93     G3V 71 0
8 HD 11505 PM* 01 53 06.1988751114 -01 19 36.989848245   8.05 7.42     G5V 110 0
9 HD 12264 PM* 02 00 05.3379490800 -13 32 46.000535316   8.64 7.98     G5V 57 0
10 HD 12387 PM* 02 00 32.1252087532 -40 43 52.490527468   8.02 7.36     G5VFe-0.8CH-0.7 102 0
11 HD 13724 PM* 02 12 20.6772821184 -46 48 58.954833684   8.56 7.87     G3/5V 69 0
12 HD 19467 PM* 03 07 18.5750514360 -13 45 42.417982152   7.65 7.00 7.79 8.82 G3V 146 0
13 * zet01 Ret PM* 03 17 46.1634549490 -62 34 31.152456644 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 284 0
14 * zet02 Ret ** 03 18 12.8188824117 -62 30 22.904711032   5.814 5.228     G1V 346 0
15 HD 20619 PM* 03 19 01.8943387080 -02 50 35.493108792 7.82 7.697 7.039 6.691 6.343 G1.5V 183 0
16 HD 20782 PM* 03 20 03.5777546706 -28 51 14.660358176   8.03 7.38     G1.5V 183 1
17 HD 27063 PM* 04 16 30.2412812112 -00 34 22.092673404   8.71 8.07     G3V 76 0
18 HD 28471 PM* 04 25 09.1505362837 -64 04 48.251223739   8.56 7.91     G5V 78 0
19 HD 28821 * 04 32 21.4722509232 -05 02 20.418099324   8.29 7.61     G3V 70 0
20 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 153 1
21 HD 31527 PM* 04 55 38.3826333744 -23 14 30.761639592   8.071 7.484 7.24 8.88 G0V 87 1
22 HD 38277 PM* 05 44 17.5968877872 -10 01 00.233533380   7.73 7.12     G1V 66 0
23 HD 38858 PM* 05 48 34.9402551240 -04 05 40.721787744 6.71 6.61 5.97     G2V 278 1
24 HD 45289 PM* 06 24 24.3502565548 -42 50 51.065558426   7.35 6.67     G2V 127 0
25 HD 45184 PM* 06 24 43.8795895848 -28 46 48.415725948   7.01 6.39 6.24 8.94 G2Va 181 1
26 HD 59711 PM* 07 30 40.0131351696 -15 59 40.506885096   8.35 7.71     G2V 79 0
27 HD 59967 PM* 07 30 42.5117581608 -37 20 21.706958688 7.386 7.274 6.635 6.28 5.945 G3V 144 0
28 HD 66428 PM* 08 03 28.6676662536 -01 09 45.758091420   8.97 8.26     G8IV(+G) 118 1
29 HD 67458 PM* 08 07 00.5223530881 -29 24 10.577501137 7.47 7.39 6.79     G0V 126 0
30 HD 71334 PM* 08 25 49.5155726353 -29 55 50.133816869   8.49 7.82     G2.5V 118 0
31 HD 75302 PM* 08 49 12.5288521056 +03 29 05.117812440       7.0   G5V 83 0
32 HD 78429 PM* 09 06 38.8310026968 -43 29 31.119230904   7.93 7.33     G2V 114 0
33 HD 88084 PM* 10 09 08.2459210080 -15 29 40.194438936   8.18 7.54     G2V 73 0
34 HD 89454 PM* 10 19 16.2817449288 -11 22 42.644765496   8.75 8.05     G5V 65 0
35 HD 92719 PM* 10 42 13.3208854176 -13 47 15.771277068 7.519 7.406 6.767 6.42 6.083 G1.5V 100 0
36 HD 95521 PM* 11 00 50.2624501440 -49 01 11.414177400   8.22 7.57     G2V 67 0
37 HD 96116 * 11 04 13.6519319736 -57 45 54.477392472   9.34 8.69     G3V 59 0
38 HD 96423 PM* 11 06 19.7446310712 -44 22 23.941868664   7.92 7.23     G5V 92 0
39 HD 102117 PM* 11 44 50.4608641248 -58 42 13.357947852   8.20 7.45     G6V 107 1
40 HD 102365 PM* 11 46 31.0725331317 -40 30 01.285867174 5.65 5.55 4.88 4.35 3.97 G2V 310 1
41 HD 104982 PM* 12 05 13.4085678880 -28 43 02.029070149   8.47 7.82     G2V 89 0
42 HD 106116 PM* 12 12 28.8425407188 -03 05 04.109959534   8.15 7.50     G5V 169 0
43 HD 108309 PM* 12 26 48.1417421363 -48 54 47.499505755   6.94 6.26     G2V 155 0
44 HD 109271 PM* 12 33 35.5545820056 -11 37 18.728871528   8.71 8.05     G3/5V 55 1
45 HD 111031 PM* 12 46 30.8420623488 -11 48 44.790190956   7.57 6.87     G5V 93 1
46 HD 114853 PM* 13 13 52.2256885584 -45 11 08.884868676 7.681 7.583 6.940 6.559 6.226 G1.5V 102 0
47 HD 115674 PM* 13 23 00.0726028057 -81 18 36.411845843   8.55 7.87     G5VFe-0.7 61 0
48 HD 117105 PM* 13 28 30.5527705748 -27 23 30.646767635   7.78 7.21     F9.5V 83 0
49 HD 117207 PM* 13 29 21.1129060560 -35 34 15.587968296   7.98 7.25     G7IV-V 121 1
50 HD 126525 PM* 14 27 32.9719003174 -51 55 59.106980352   8.529 7.85 7.56 8.31 G4V 95 1
51 HD 134664 PM* 15 12 10.3537197864 -30 53 10.652718912   8.40 7.73     G1.5V 89 0
52 * 23 Lib PM* 15 13 28.6669233518 -25 18 33.653388418   7.168 6.46 6.43   G6IV-V 281 1
53 HD 134606 PM* 15 15 15.0446421648 -70 31 10.644909780   7.61 6.854 6.69 8.89 G6IV 77 1
54 * 18 Sco PM* 16 15 37.2702755653 -08 22 09.982125430   6.15 5.50     G2Va 545 0
55 HD 145927 PM* 16 16 06.4203499992 -52 48 52.367171184   8.987 8.37     G3V 61 0
56 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 500 2
57 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13091 0
58 HD 177409 PM* 19 09 54.5555321208 -68 17 58.887748536   8.14 7.52     G1VCH-0.4 67 0
59 HD 183658 PM* 19 30 52.7192905944 -06 30 51.925245768   7.93 7.28     G3V 102 0
60 * 16 Cyg A ** 19 41 48.9534996168 +50 31 30.219536784 6.79 6.59 5.95 5.50 5.17 G1.5Vb 717 1
61 * 16 Cyg B PM* 19 41 51.9726777456 +50 31 03.089030916 7.07 6.86 6.20 5.76 5.42 G3V 842 1
62 HD 189625 PM* 20 01 32.8001816928 -16 52 08.392879272   7.99 7.33     G5V 75 0
63 HD 189567 PM* 20 05 32.7654888837 -67 19 15.226124354 6.79 6.71 6.07     G2V 212 1
64 HD 190647 PM* 20 07 19.6699756416 -35 32 19.077690912   8.54 7.78     G5V 78 1
65 HD 196390 PM* 20 39 02.5204451352 -49 19 53.123980188   7.96 7.32     G1.5V 59 0
66 HD 198075 * 20 48 15.1894410960 -12 27 15.484766616   8.62 8.03     G0.5V 61 0
67 HD 200633 PM* 21 04 44.1476682576 -04 49 44.026181580   9.00 8.34     G5V 64 0
68 HD 202628 PM* 21 18 27.2696247000 -43 20 04.743062448   7.39 6.742     G5V 163 0
69 HD 204313 PM* 21 28 12.2060861256 -21 43 34.518205128   8.696 8.02 7.76   G5V 100 2
70 HD 208704 PM* 21 58 24.3257393664 -12 39 52.770231612   7.77 7.17     G1V 81 0
71 HD 210918 PM* 22 14 38.6528791223 -41 22 53.994495360 7.02 6.88 6.23     G2V 189 0
72 HD 211415 PM* 22 18 15.6133953371 -53 37 37.466806476   5.98 5.39 6.52   G0V 179 0
73 HD 220507 PM* 23 24 42.1153260048 -52 42 06.759585936   8.28 7.58     G5V 92 0
74 HD 222582 PM* 23 41 51.5300932008 -05 59 08.729137104   8.34 7.69     G5V 217 2

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2022.08.10-19:34:05

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