Revealing the formation mechanism of the Milky Way stellar halo based on chemical abundance analyses of large datasets of metal-poor stars
| Project/Area Number |
17K14249
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Astronomy
|
|---|
| Research Institution | Tohoku University (2018-2019)
The University of Tokyo (2017) |
|---|
Principal Investigator |
Ishigaki Miho 東北大学, 理学研究科, 特任助教(研究) (30583611)
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Project Status |
Completed (Fiscal Year 2019)
|
| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
|---|
| Keywords | 銀河考古学 / 天の川銀河 / 恒星 / 元素組成 / スペクトル / 銀河系 / 元素合成 / 金属欠乏星 / 恒星分光学 / 初代星 / 銀河系形成 / 化学進化 / スペクトル解析 / 天文学 / 分光観測 |
|---|
| Outline of Final Research Achievements |
The ultimate purpose of this study is to reveal nucleosynthesis in the early Universe as well as the formation and chemical evolution of the Milky Way based on planed large spectroscopic surveys. The major achievements of this study are two folds. (1) Making use of archival spectroscopic data combined with latest astrometric data, we have constructed the library of standard stars for chemical abundance analyses, which can be used in upcoming spectroscopic surveys. Based on the candidate standard star's spectra from the archival data, physical quantities such as temperature and chemical composition have been derived. (2)We compared the models of nucleosynthetic products from supernovae and observed chemical compositions of old stars in the Milky Way. As a result, we have obtained a certain constraint on physical properties of the very first stars in the Universe.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究は、２０２０ー２０３０年代にかけて大きく進展が見込まれている天の川銀河の大規模恒星サーベイで最大限の成果を得るため、データ解析とデータ解釈の二つの側面で独自の貢献をすることができた。まずデータ解析では、世界最大級のすばる望遠鏡の過去のデータを最新の位置天文学データと連携させることで、大規模恒星サーベイにおいて広く有効活用できることを示した。さらにデータ解釈の面では、超新星爆発元素合成理論モデルを用いた研究を通して、天の川銀河に生き残る最古の恒星である金属欠乏星の観測から直接見ることのできない宇宙初期について観測的な証拠を得る「銀河考古学」のアプローチを具体的に示すものとなった。
|
Report
(4 results)
Research Products
(27 results)
-
-
-
-
-
-
[Journal Article] Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327-23262019
Author(s)
Ezzeddine, R., Frebel, A., Roederer, I. U., Tominaga, N., Tumlinson, J., Ishigaki, M., Nomoto, K., Placco, V. M., and Aoki, W.
-
Journal Title
The Astrophysical Journal, Volume 876, Issue 2, article id. 97, 8 pp. (2019).
Volume: 876
Issue: 2
Pages: 97-97
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
[Journal Article] Foreground effect on the J-factor estimation of ultrafaint dwarf spheroidal galaxies2018
Author(s)
Ichikawa, K., Horigome, S., Ishigaki, M. N., Matsumoto, S., Ibe, M., Sugai, H., Hayashi, K.
-
Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 479
Issue: 1
Pages: 64-74
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
