Observational Establishment of the Period-Luminosity Relation in the Evolution of High-mass Protostars
| Project/Area Number |
19K03921
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
SUGIYAMA Koichiro 国立天文台, 水沢VLBI観測所, 特別客員研究員 (50624954)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 電波天文学 / 大質量星形成 / 強度変動 / メーザー / 周期変動 / 周期光度関係 / 突発増光 / 降着バースト / 周期的強度変動 / 位置天文学 |
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| Outline of Research at the Start |
太陽程度の星より1桁以上重たい大質量星の進化、特に若い段階(原始星)における経路の解明、及びそのために重要な原始星表面における質量降着率の観測的導出法の確立を目指す。そこで、理論提唱されている大質量原始星の脈動不安定(周期的に明るさが変動)モデル、及びそのモデルから予言される周期-光度関係に着目する。本研究では、周期-光度関係の観測的な検証と確立を目指し、6.7GHzメタノール分子のメーザー放射が示す周期的な強度変動の系統的探査の完結と、22.2GHz水分子のメーザー放射を用いた周期変動天体に対する年周視差計測による天体距離と光度の高精度な決定を目指す。
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| Outline of Final Research Achievements |
To understand the evolutionary track of high-mass protostars, we aimed to observationally establish Period-Luminosity relation that could be an exclusively way for measurement of accretion rates onto the stellar surface, via completing 1) new detections of periodic methanol masers in beyond 30 sources via high-cadence & long-term intense flux monitoring with Ibaraki 32-m radio telescope since the end of 2012, & 2) parallax measurements to determine accurate distances (within 20% uncertainties) for two periodic targets: G35.79 & G37.47 with very-long-baseline-interferometry VERA. In addition, as by-product of the intense monitoring with Ibaraki 32-m, we achieved a new detection of drastic flux bursting activities of methanol masers at the high-mass protostar G358.93-00.03MM1, and via follow-up observations with M2O that is the world-wide maser monitoring organization this phenomenon was verified to be caused by an accretion burst and its accreting structure on a disk was unveiled.
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| Academic Significance and Societal Importance of the Research Achievements |
大質量星の進化に最も大きな影響を及ぼす物理現象でありながら、1天文単位未満と微小な星表面において生じるガス降着率の、ほぼ唯一と言っても良いほど希少な導出法と期待される周期-光度関係の観測的確立へ向けて、周期変動サンプルの大幅な増加と、光度を高精度に決定する上で不可欠な距離計測を複数天体で達成出来たことは、本確立へ向けた大きな前進と言える。また、G358における降着バーストの新検出と、そのガス降着構造を詳細に明らかに出来たことは、大質量星の進化に不可欠なガス降着現象の直接的な観測研究の達成、および進化トラックにおける降着バースト現象の普遍性を高めた、という点で高い学術的意義を持つ結果と言える。
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Report
(4 results)
Research Products
(46 results)
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[Journal Article] VLBI Future Planning Working Group Review Report2021
Author(s)
Akahori, Takuya; Imai, Hiroshi; Eie, Sujin; Oyama, Tomoaki; Kimura, Kimihiro; Kurayama, Tomoharu; Kono, Yusuke; Kobayashi, Hideyuki; Sakai, Daisuke; Sakai, Nobuyuki; Teraya, Takaaki; Jike, Takaaki; Motogi, Kazuhito; Sugiyama, Koichiro (14番目); ...他12名
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Journal Title
VLBI Future Planning Working Group Review Report, June 2021, 4th Edition
Volume: -
Related Report
Open Access
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[Journal Article] Multiple Outflows in the High-mass Cluster-forming Region G25.82-0.172020
Author(s)
Kim Jungha、Kim Mi Kyoung、Hirota Tomoya、Kim Kee-Tae、Sugiyama Koichiro、Honma Mareki、Byun Do-young、Oh Chungsik、Motogi Kazuhito、Kang Jihyun、Kim Jeongsook、Liu Tie、Hu Bo、Burns Ross A.、Chibueze James O.、Matsumoto Naoko、Sunada Kazuyoshi
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Journal Title
The Astrophysical Journal
Volume: 896
Issue: 2
Pages: 127-127
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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