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Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
- Title
- Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
- Authors
- Lee A.; Lee Y.S.; Kim Y.K.; Beers T.C.; An D.
- Ewha Authors
- 안덕근
- SCOPUS Author ID
- 안덕근
- Issue Date
- 2023
- Journal Title
- Astrophysical Journal
- ISSN
- 0004-637X
- Citation
- Astrophysical Journal vol. 945, no. 1
- Publisher
- Institute of Physics
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber Spectroscopic Telescope. When divided into two groups, a low-[α/Fe] population (LAP) and a high-[α/Fe] population (HAP), based on kinematics and chemistry, we find that they exhibit very distinct properties, indicative of different origins. From a detailed analysis of their orbital inclinations, we suggest that the HAP arises from a large fraction (∼90%) of heated disk stars and a small fraction (∼10%) of in situ stars from a starburst population, likely induced by interaction of the Milky Way with the Gaia-Sausage/Enceladus (GSE) or another early merger. The LAP comprises about half accreted stars from the GSE and half formed by the GSE-induced starburst. Our findings further imply that the Splash stars in our sample originated from at least three different mechanisms: accretion, disk heating, and a merger-induced starburst. © 2023. The Author(s). Published by the American Astronomical Society.
- DOI
- 10.3847/1538-4357/acb6f5
- Appears in Collections:
- 사범대학 > 과학교육과 > Journal papers
- Files in This Item:
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Lee_2023_ApJ_945_56.pdf(1.11 MB)
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