Blocking metal accretion onto low-mass population III stars by stellar wind

Shuta J. Tanaka, Gen Chiaki, Nozomu Tominaga, Hajime Susa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Low-mass population III (PopIII) stars could survive up until the present. They would be found in the halo of Our Galaxy, if they exist. Non-detection of low-mass PopIII stars in our Galaxy suggests that PopIII stars have a top-heavy IMF. On the other hand, some claims that the lack of such stars is as a result of metal enrichment of their surface by accretion of heavy elements from interstellar medium (ISM). We investigate effects of the stellar wind on the metal accretion onto low-mass PopIII stars because accretion of the local ISM onto the Sun is prevented by the solar wind even for neutrals. We find that low-mass PopIII stars traveling across the Galaxy forms the stellar magnetosphere in most of their life. Once the magnetosphere is formed, most of neutral interstellar particles are photoionized before reaching to the stellar surface and are blown away by the wind. This demonstrates that low-mass PopIII stars remain pristine and will be found as metal free stars and that further searches for them are valuable to constrain the IMF of PopIII stars.

Original languageEnglish
Title of host publication14th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG2017
EditorsKevin Insik Hahn, Young Sun Lee, Sunchan Jeong, Sang Chul Kim, Myung-Ki Cheoun, Kyujin Kwak, Sung-Chul Yoon
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735416420
DOIs
Publication statusPublished - 2018 Apr 25
Externally publishedYes
Event14th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG2017 - Daejeon, Korea, Republic of
Duration: 2017 Jun 272017 Jun 30

Publication series

NameAIP Conference Proceedings
Volume1947
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other14th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG2017
Country/TerritoryKorea, Republic of
CityDaejeon
Period17/6/2717/6/30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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