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The Metallicity Distribution of the Milky Way using Variable Stars

Research Project

Project/Area Number 16H07323
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKyoto Sangyo University

Principal Investigator

FUKUE Kei  京都産業大学, 神山天文台, 研究員 (20785753)

Project Period (FY) 2016-08-26 – 2018-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords恒星 / 変光星 / 化学組成 / 天文 / 天文学
Outline of Final Research Achievements

For detailed analysis of stellar chemical abundances, high-resolution spectra in the optical have been mainly used, while recent development of near-infrared (near-IR) spectrometers has opened new wavelength windows. The severe foreground reddening towards the Galactic plane, especially in the direction of the Galactic Center requires observation in the IR windows. Therefore, the goals of this study are twofold: (1) to establish the method of determining stellar atmospheric parameters and (2) to estimate iron and other elemental abundances of Cepheids. We obtained high resolution and high quality spectra of well-studied stars, using WINERED. We invented new methods of determining effective temperatures, microturbulences and the iron abundances. We are going to relocate WINERED to large diameter telescope.

Academic Significance and Societal Importance of the Research Achievements

最近の近赤外線観測装置の発達により減光の強い銀河系中心領域を見通す事が可能となり、銀河系中心領域やバルジ、ディスクの広い範囲にわたって、セファイドを含む様々な恒星が同定され始めている。そのような天体に対して、本研究で構築した手法を適用させることで、天体ごとの有効温度や金属量を導出することができる。そのようにして得られた各天体の物理情報から、銀河系の進化や星形成史の解明につながることが期待される。

Report

(3 results)
  • 2018 Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (10 results)

All 2019 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] The metallicity effect on line-depth ratios in APOGEE H-band spectra2019

    • Author(s)
      Jian Mingjie、Matsunaga Noriyuki、Fukue Kei
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 485 Issue: 1 Pages: 1310-1319

    • DOI

      10.1093/mnras/stz237

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Method to estimate the effective temperatures of late-type giants using line-depth ratios in the wavelength range 0.97?1.32?μm2017

    • Author(s)
      Taniguchi Daisuke、Matsunaga Noriyuki、Kobayashi Naoto、Fukue Kei、Hamano Satoshi、Ikeda Yuji、Kawakita Hideyo、Kondo Sohei、Sameshima Hiroaki、Yasui Chikako
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 473 Issue: 4 Pages: 4993-5001

    • DOI

      10.1093/mnras/stx2691

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 近赤外線高分散分光器 WINERED : 晩期型星の近赤外線高分散スペクトルを用いた元素のアバンダンス導出と発展性について2019

    • Author(s)
      福江慧
    • Organizer
      日本天文学会 2019年春季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Measuring chemical abundances of red giants using high-resolution z’YJ-band spectra of WINERED2018

    • Author(s)
      福江慧
    • Organizer
      THE LIFE AND TIMES OF THE MILKY WAY
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 近赤外線高分散分光器WINEREDを用いた、z',Y,Jバンドにおける晩期型星の化学組成解析2018

    • Author(s)
      福江慧
    • Organizer
      第23回 天体スペクトル研究会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Abundance determination methods of variable stars with NIR high-resolution spectroscopy2017

    • Author(s)
      福江慧
    • Organizer
      「天の川銀河や近傍銀河における変光星と減光則の研究」研究会
    • Place of Presentation
      東京大学本郷キャンパス(東京都・文京区)
    • Year and Date
      2017-03-27
    • Related Report
      2016 Annual Research Report
  • [Presentation] 近赤外線分光による変光星の解析2017

    • Author(s)
      福江慧
    • Organizer
      第22回天体スペクトル研究会
    • Place of Presentation
      仙台市天文台(宮城県・仙台市)
    • Year and Date
      2017-03-04
    • Related Report
      2016 Annual Research Report
  • [Presentation] 近赤外高分散分光器WINEREDを用いた変光星の分光観測と組成解析の現状2017

    • Author(s)
      福江慧
    • Organizer
      天の川銀河研究会 2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] 近赤外線高分散分光器 WINERED : z'、Y、J バンドにおける晩期型星の元素組成解析2017

    • Author(s)
      福江慧
    • Organizer
      日本天文学会 2017年秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Abundance determinations of Cepheids with NIR high-resolution spectroscopy2016

    • Author(s)
      福江慧
    • Organizer
      「近赤外線高分散分光観測で探る恒星物理」研究会
    • Place of Presentation
      東京大学本郷キャンパス(東京都・文京区)
    • Year and Date
      2016-10-05
    • Related Report
      2016 Annual Research Report

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Published: 2016-09-02   Modified: 2020-03-30  

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