The detailed chemical abundance patterns of accreted halo stars from the optical to infrared

被引：27

作者：

Carrillo, Andreia ^{[1
,2
]}

Hawkins, Keith ^{[1
]}

Jofre, Paula ^{[3
]}

Silva, Danielle de Brito ^{[3
]}

Das, Payel ^{[4
]}

Lucey, Madeline ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[2] Univ Durham, Inst Computat Cosmol, Dept Phys, Durham DH1 3LE, England

[3] Univ Diego Portales, Fac Ingn & Ciencias, Nucleo Astron, Ejercito 441, Santiago, Chile

[4] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 513卷 / 02期

基金：

美国国家科学基金会; 美国能源部; 美国安德鲁·梅隆基金会; 英国科研创新办公室;

关键词：

stars: abundances; Galaxy: abundances; Galaxy: formation; Galaxy: halo; METAL-POOR STARS; ASYMPTOTIC GIANT BRANCH; HYPERFINE-STRUCTURE MEASUREMENTS; EFFECTIVE TEMPERATURE SCALE; SAGITTARIUS DWARF GALAXY; LMC STELLAR POPULATIONS; 1ST SPECTROSCOPIC DATA; R-PROCESS ENRICHMENT; DIGITAL SKY SURVEY; S-PROCESS;

D O I：

10.1093/mnras/stac518

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Understanding the assembly of our Galaxy requires us to also characterize the systems that helped build it. In this work, we accomplish this by exploring the chemistry of accreted halo stars from Gaia-Enceladus/Gaia-Sausage (GES) selected in the infrared from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) Data Release 16. We use high resolution optical spectra for 62 GES stars to measure abundances in 20 elements spanning the alpha, Fe-peak, light, odd-Z, and notably, the neutron-capture groups of elements to understand their trends in the context of and in contrast to the Milky Way and other stellar populations. Using these derived abundances we find that the optical and the infrared abundances agree to within 0.15 dex except for O, Co, Na, Cu, and Ce. These stars have enhanced neutron-capture abundance trends compared to the Milky Way, and their [Eu/Mg] and neutron-capture abundance ratios (e.g. [Y/Eu], [Ba/Eu], [Zr/Ba], [La/Ba], and [Nd/Ba]) point to r-process enhancement and a delay in s-process enrichment. Their [alpha/Fe] trend is lower than the Milky Way trend for [Fe/H] > -1.5 dex, similar to previous studies of GES stars and consistent with the picture that these stars formed in a system with a lower rate of star formation. This is further supported by their depleted abundances in Ni, Na, and Cu abundances, again, similar to previous studies of low-alpha stars with accreted origins.

引用

页码：1557 / 1580

页数：24

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