LAMOST J1109+7459的起源

Nour Aldein Almusleh, Yazan Khrais, Ali Taani
{"title":"LAMOST J1109+7459的起源","authors":"Nour Aldein Almusleh, Yazan Khrais, Ali Taani","doi":"10.52526/25792776-2020.67.2-267","DOIUrl":null,"url":null,"abstract":"We report a comprehensive Chemo-dynamical analysis of LAMOST J1109+0754, a relatively bright (V = 12.8), extremely metal-poor ([Fe/H] = $-3.17$), and prograde ($J_\\phi$ and $V_\\phi$ $> 0$) star, with a strong \\textit{r}-process enhancement ([Eu/Fe] = $+$0.94 $\\pm$ 0.12, [Ba/Fe] = $-$0.52 $\\pm$ 0.15). 31 chemical abundances (from Lithium to Thorium) were derived. We suggest a possible progenitor with stellar mass of 13.4-29.5 M$_\\odot$. We argue that J1109+0754 is representative of the main \\textit{r}-process component due to the well agreement with the scaled-solar \\textit{r}-process component. We analyze the orbital history of this star in a {\\it time-varying Galactic potential}, based on a Milky-Way analogue model extracted from \\texttt{Illustris-TNG} simulations. Using this model, we carry out a statistical estimation of the phase-space coordinates of J1109+0754 at a young cosmic age. Collectively, the calculated motions, the derived chemistry, and the results from the cosmological simulations suggest that LAMOST J1109+0754 most likely formed in a low-mass dwarf galaxy, and belongs to the Galactic outer-halo population.","PeriodicalId":8452,"journal":{"name":"arXiv: Astrophysics of Galaxies","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2020-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Origin of LAMOST J1109+7459\",\"authors\":\"Nour Aldein Almusleh, Yazan Khrais, Ali Taani\",\"doi\":\"10.52526/25792776-2020.67.2-267\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report a comprehensive Chemo-dynamical analysis of LAMOST J1109+0754, a relatively bright (V = 12.8), extremely metal-poor ([Fe/H] = $-3.17$), and prograde ($J_\\\\phi$ and $V_\\\\phi$ $> 0$) star, with a strong \\\\textit{r}-process enhancement ([Eu/Fe] = $+$0.94 $\\\\pm$ 0.12, [Ba/Fe] = $-$0.52 $\\\\pm$ 0.15). 31 chemical abundances (from Lithium to Thorium) were derived. We suggest a possible progenitor with stellar mass of 13.4-29.5 M$_\\\\odot$. We argue that J1109+0754 is representative of the main \\\\textit{r}-process component due to the well agreement with the scaled-solar \\\\textit{r}-process component. We analyze the orbital history of this star in a {\\\\it time-varying Galactic potential}, based on a Milky-Way analogue model extracted from \\\\texttt{Illustris-TNG} simulations. Using this model, we carry out a statistical estimation of the phase-space coordinates of J1109+0754 at a young cosmic age. Collectively, the calculated motions, the derived chemistry, and the results from the cosmological simulations suggest that LAMOST J1109+0754 most likely formed in a low-mass dwarf galaxy, and belongs to the Galactic outer-halo population.\",\"PeriodicalId\":8452,\"journal\":{\"name\":\"arXiv: Astrophysics of Galaxies\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-11-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv: Astrophysics of Galaxies\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.52526/25792776-2020.67.2-267\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Astrophysics of Galaxies","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.52526/25792776-2020.67.2-267","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

我们对LAMOST J1109+0754进行了全面的化学动力学分析,这是一颗相对明亮(V = 12.8),极贫金属([Fe/H] = $-3.17$),顺行($J_\phi$和$V_\phi$$> 0$)的恒星,具有很强的\textit{r-}过程增强([Eu/Fe] = $+$ 0.94 $\pm$ 0.12, [Ba/Fe] = $-$ 0.52 $\pm$ 0.15)。得到了31种化学丰度(从锂到钍)。我们提出一个可能的祖恒星质量为13.4-29.5 M $_\odot$。我们认为J1109+0754是主要r-\textit{过程}组分的代表,因为它与尺度太阳能r-过程\textit{组分具有良好的一致性}。我们{\it基于从Illustris-TNG模拟中提取的银河系模拟模型,分析了这颗恒星在随时间变化的银河系势}中的轨道历史。利用\texttt{这个模型,我们}对J1109+0754在年轻宇宙年龄时的相空间坐标进行了统计估计。总的来说,计算出的运动、推导出的化学物质以及宇宙学模拟的结果表明,LAMOST J1109+0754最有可能形成于一个低质量矮星系,属于银河系外晕群。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Origin of LAMOST J1109+7459
We report a comprehensive Chemo-dynamical analysis of LAMOST J1109+0754, a relatively bright (V = 12.8), extremely metal-poor ([Fe/H] = $-3.17$), and prograde ($J_\phi$ and $V_\phi$ $> 0$) star, with a strong \textit{r}-process enhancement ([Eu/Fe] = $+$0.94 $\pm$ 0.12, [Ba/Fe] = $-$0.52 $\pm$ 0.15). 31 chemical abundances (from Lithium to Thorium) were derived. We suggest a possible progenitor with stellar mass of 13.4-29.5 M$_\odot$. We argue that J1109+0754 is representative of the main \textit{r}-process component due to the well agreement with the scaled-solar \textit{r}-process component. We analyze the orbital history of this star in a {\it time-varying Galactic potential}, based on a Milky-Way analogue model extracted from \texttt{Illustris-TNG} simulations. Using this model, we carry out a statistical estimation of the phase-space coordinates of J1109+0754 at a young cosmic age. Collectively, the calculated motions, the derived chemistry, and the results from the cosmological simulations suggest that LAMOST J1109+0754 most likely formed in a low-mass dwarf galaxy, and belongs to the Galactic outer-halo population.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信