| dc.creator |
Mardini, Mohammad K |
|
| dc.creator |
Placco, Vinicius M |
|
| dc.creator |
Meiron, Yohai |
|
| dc.creator |
Ishchenko, Marina |
|
| dc.creator |
Avramov, Branislav |
|
| dc.creator |
Mazzarini, Matteo |
|
| dc.creator |
Berczik, Peter |
|
| dc.creator |
Sedda, Manuel Arca |
|
| dc.creator |
Beers, Timothy C |
|
| dc.creator |
Frebel, Anna |
|
| dc.creator |
Taani, Ali |
|
| dc.creator |
Donnari, Martina |
|
| dc.creator |
Al-Wardat, Mashhoor A |
|
| dc.creator |
Zhao, Gang |
|
| dc.date |
2022-04-11T18:24:40Z |
|
| dc.date |
2022-04-11T18:24:40Z |
|
| dc.date |
2020 |
|
| dc.date |
2022-04-11T18:08:06Z |
|
| dc.date.accessioned |
2023-03-01T18:06:00Z |
|
| dc.date.available |
2023-03-01T18:06:00Z |
|
| dc.identifier |
https://hdl.handle.net/1721.1/141831 |
|
| dc.identifier |
Mardini, Mohammad K, Placco, Vinicius M, Meiron, Yohai, Ishchenko, Marina, Avramov, Branislav et al. 2020. "Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754." Astrophysical Journal, 903 (2). |
|
| dc.identifier.uri |
http://localhost:8080/xmlui/handle/CUHPOERS/278743 |
|
| dc.description |
This study presents a comprehensive chemodynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor ([Fe/H] = -3.17) star, with a strong r-process enhancement ([Eu/Fe] = +0.94 ± 0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition derived from a high-resolution (R ∼ 110,000), high signal-to-noise ratio (S N ∼ 60) optical spectrum obtained by the 2.4 m Automated Planet Finder Telescope at Lick Observatory. We obtain chemical abundances of 31 elements (from lithium to thorium). The abundance ratios ([X/Fe]) of the light elements (Z ≤ 30) suggest a massive Population III progenitor in the 13.4-29.5M⊙ mass range. The heavy-element (30 < Z ≤ 90) abundance pattern of J1109+075 agrees extremely well with the scaled-solar r-process signature. We have developed a novel approach to trace the kinematic history and orbital evolution of J1109+0754 with a cOsmologically deRIved timE-varyiNg Galactic poTential (the ORIENT) constructed from snapshots of a simulated Milky Way analog taken from the Illustris-TNG simulation. The orbital evolution within this Milky Way-like galaxy, along with the chemical abundance pattern, implies that J1109+0754 likely originated in a low-mass dwarf galaxy located ∼60 kpc from the center of the Galaxy, which was accreted ∼6-7 Gyr ago, and that the star now belongs to the outer-halo population. |
|
| dc.format |
application/pdf |
|
| dc.language |
en |
|
| dc.publisher |
American Astronomical Society |
|
| dc.relation |
10.3847/1538-4357/ABBC13 |
|
| dc.relation |
Astrophysical Journal |
|
| dc.rights |
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. |
|
| dc.source |
The American Astronomical Society |
|
| dc.title |
Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754 |
|
| dc.type |
Article |
|
| dc.type |
http://purl.org/eprint/type/JournalArticle |
|