The GALAH survey: temporal chemical enrichment of the galactic disc

被引：23

作者：

Lin, Jane ^{[1
,2
]}

Asplund, Martin ^{[1
,2
]}

Ting, Yuan-Sen ^{[3
,4
,5
]}

Casagrande, Luca ^{[1
,2
]}

Buder, Sven ^{[6
]}

Bland-Hawthorn, Joss ^{[2
,7
]}

Casey, Andrew R. ^{[8
]}

De Silva, Gayandhi M. ^{[9
]}

D'Orazi, Valentina ^{[10
]}

Freeman, Ken C. ^{[1
,2
]}

Kos, Janez ^{[11
]}

Lind, K. ^{[6
,12
]}

Martell, Sarah L. ^{[2
,13
]}

Sharma, Sanjib ^{[2
,7
]}

Simpson, Jeffrey D. ^{[13
]}

Zwitter, Tomaz ^{[11
]}

Zucker, Daniel B. ^{[9
]}

Minchev, Ivan ^{[14
]}

Cotar, Klemen ^{[11
]}

Hayden, Michael ^{[2
,7
]}

Horner, Jonti ^{[15
]}

Lewis, Geraint F. ^{[7
]}

Nordlander, Thomas ^{[1
,2
]}

Wyse, Rosemary F. G. ^{[16
]}

Zerjal, Marusa ^{[1
,2
]}

机构：

[1] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[2] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia

[3] Inst Adv Study, Princeton, NJ 08540 USA

[4] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[5] Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA

[6] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[7] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[8] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[9] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia

[10] INAF, Osservatorio Astron Padova, Padua, Italy

[11] Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia

[12] Uppsala Univ, Dept Phys & Astron, Observat Astrophys, Box 516, SE-75120 Uppsala, Sweden

[13] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[14] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[15] Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia

[16] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 491卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

stars: abundances; stars: fundamental parameters; solar neighbourhood; AGE-METALLICITY RELATION; NEARBY STARS; DATA RELEASE; EVOLUTION; ISOCHRONES; ABUNDANCES; FIELD; MILKY; HALO; SPECTROSCOPY;

D O I：

10.1093/mnras/stz3048

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present isochrone ages and initial bulk metallicities ([Fe/H](bulk), by accounting for diffusion) of 163 722 stars from the GALAH Data Release 2, mainly composed of main-sequence turn-off stars and subgiants (7000 K > T-eff > 4000 K and log g > 3 dex). The local age-metallicity relationship (AMR) is nearly flat but with significant scatter at all ages; the scatter is even higher when considering the observed surface abundances. After correcting for selection effects, the AMR appears to have intrinsic structures indicative of two star formation events, which we speculate are connected to the thin and thick discs in the solar neighbourhood. We also present abundance ratio trends for 16 elements as a function of age, across different [Fe/H](bulk) bins. In general, we find the trends in terms of [X/Fe] versus age from our far larger sample to be compatible with studies based on small (similar to 100 stars) samples of solar twins, but we now extend them to both sub- and supersolar metallicities. The a-elements show differing behaviour: the hydrostatic alpha-elements O and Mg show a steady decline with time for all metallicities, while the explosive alpha-elements Si, Ca, and Ti are nearly constant during the thin-disc epoch (ages less than or similar to 12 Gyr). The s-process elements Y and Ba show increasing [X/Fe] with time while the r-process element Eu has the opposite trend, thus favouring a primary production from sources with a short time delay such as core-collapse supernovae over long-delay events such as neutron star mergers.

引用

页码：2043 / 2056

页数：14

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