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


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:22:15

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>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 6204 * 01 02 57.4204868552 -09 51 40.460185331   9.17 8.53     G3V 34 0
2 HD 11505 PM* 01 53 06.1989698822 -01 19 36.988964012   8.05 7.42     G5V 97 0
3 HD 12264 PM* 02 00 05.3380960261 -13 32 46.000032697   8.64 7.98     G5V 51 0
4 HD 13724 PM* 02 12 20.6773987817 -46 48 58.956648209   8.56 7.87     G3/5V 57 0
5 HD 19467 PM* 03 07 18.5750358835 -13 45 42.419198459   7.65 7.00 7.79 8.82 G3V 125 0
6 * zet01 Ret PM* 03 17 46.1632605674 -62 34 31.154247481 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 271 0
7 * zet02 Ret ** 03 18 12.8185412558 -62 30 22.917300282   5.814 5.228     G1V 329 0
8 HD 20619 PM* 03 19 01.8944014526 -02 50 35.492892644 7.82 7.697 7.039 6.691 6.343 G1.5V 167 0
9 HD 20782 PM* 03 20 03.5777409770 -28 51 14.660409684   8.03 7.38     G1.5V 160 1
10 NAME Ret GlC 04 36 11.4 -58 51 47   14.00 14.25 13.50   ~ 145 1
11 HD 45289 PM* 06 24 24.3504406831 -42 50 51.065016406   7.35 6.67     G2V 113 0
12 HD 45184 PM* 06 24 43.8797456693 -28 46 48.416253741   7.01 6.39 6.24 8.94 G2Va 165 1
13 HD 59711 PM* 07 30 40.0131777539 -15 59 40.505491099   8.35 7.71     G2V 70 0
14 HD 59967 PM* 07 30 42.5117283582 -37 20 21.704201159 7.386 7.274 6.635 6.28 5.945 G3V 131 0
15 HD 75302 PM* 08 49 12.5290101188 +03 29 05.120327518       7.0   G5V 74 0
16 HD 89454 PM* 10 19 16.2817736819 -11 22 42.644074949   8.75 8.05     G5V 56 0
17 HD 96423 PM* 11 06 19.7446501611 -44 22 23.939505002   7.92 7.23     G5V 81 0
18 HD 102365 PM* 11 46 31.0719919710 -40 30 01.279976346 5.65 5.55 4.88 4.35 3.97 G2V 290 1
19 HD 108309 PM* 12 26 48.1415053432 -48 54 47.499036831   6.94 6.26     G2V 144 0
20 HD 114853 PM* 13 13 52.2256855782 -45 11 08.881921063 7.681 7.583 6.940 6.559 6.226 G1.5V 91 0
21 HD 117207 PM* 13 29 21.1129830405 -35 34 15.586278234   7.98 7.25     G7IV-V 106 1
22 HD 126525 PM* 14 27 32.9718177113 -51 55 59.107520674   8.529 7.85 7.56 8.31 G4V 83 1
23 HD 134664 PM* 15 12 10.3535587878 -30 53 10.651147031   8.40 7.73     G1.5V 77 0
24 * 23 Lib PM* 15 13 28.6671093171 -25 18 33.654699099   7.168 6.46 6.43   G6IV-V 259 1
25 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 490 0
26 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 468 2
27 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11760 0
28 HD 183658 PM* 19 30 52.7191481248 -06 30 51.925192506   7.93 7.28     G3V 89 0
29 * 16 Cyg A ** 19 41 48.9539315338 +50 31 30.218780803 6.79 6.59 5.95 5.50 5.17 G1.5Vb 679 1
30 * 16 Cyg B PM* 19 41 51.9731830550 +50 31 03.086127222 7.07 6.86 6.20 5.76 5.42 G3V 799 1
31 HD 189625 PM* 20 01 32.8001962302 -16 52 08.395215304   7.99 7.33     G5V 64 0
32 HD 189567 PM* 20 05 32.7652367983 -67 19 15.228862402 6.79 6.71 6.07     G2V 199 1
33 HD 196390 PM* 20 39 02.5202320733 -49 19 53.126738154   7.96 7.32     G1.5V 49 0
34 HD 202628 PM* 21 18 27.2693236958 -43 20 04.746121764   7.39 6.742     G5V 144 0
35 HD 210918 PM* 22 14 38.65336 -41 22 53.9866 7.02 6.88 6.23     G2V 179 0
36 HD 211415 PM* 22 18 15.6134595819 -53 37 37.466488939   5.98 5.39 6.52   G0V 166 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:22:15

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