Stellar abundance analysis based on near-infrared high-resolution spectra and applications to studies on the Milky Way

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287028
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Matsunaga Noriyuki 東京大学, 大学院理学系研究科(理学部), 助教 (80580208)
• Co-Investigator(Kenkyū-buntansha): 小林 尚人 東京大学, 大学院理学系研究科(理学部), 准教授 (50280566) ; 河北 秀世 京都産業大学, 理学部, 教授 (70356129)
• Co-Investigator(Renkei-kenkyūsha): KONDO Sohei 京都産業大学, 神山天文台, 特定研究員 (30583413) ; TSUJIMOTO Takuji 国立天文台, JASMINE検討室, 助教 (10270456)
• Research Collaborator: ARAI Akira ; SAMESHIMA Hiroaki ; HAMANO Satoshi ; FUKUE Kei ; YASUI Chikako
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 赤外線分光観測 / 恒星化学組成 / 天の川銀河 / 脈動変光星

Outline of Final Research Achievements

Measuring the positions, kinematics, chemical abundances of stars is important in understanding the structure and evolution of the Milky Way galaxy. In its disk region, a large amount of gas and dust co-exist with stars, and the strong interstellar extinction caused by dust makes observations in the visible difficult or impossible. Our research focuses on infrared observations, both photometric and spectroscopic, which can penetrate the interstellar extinction. We installed the high-resolution mode to our near-infrared spectrograph, WINERED, and developed methods and data sets necessary for analysis of the near-infrared high-resolution spectra. We also made achievements in studies on pulsating stars, which are behind the dust veil of the Milky Way disk, including the first discoveries of Cepheids in the flared part of the disk and carbon-rich Miras in the bulge.

Free Research Field

光学赤外線天文学