High dispersion spectroscopy of solar-type superflare stars. III. Lithium abundances

DOI DOI PDF 被引用文献5件 参考文献43件
  • Satoshi Honda
    1Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo-cho, Sayo, Hyogo 679-5313, Japan
  • Yuta Notsu
    2Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  • Hiroyuki Maehara
    3Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan
  • Shota Notsu
    2Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  • Takuya Shibayama
    4Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • Daisaku Nogami
    2Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  • Kazunari Shibata
    5Kwasan Observatory, Kyoto University, Yamashina-ku, Kyoto, Kyoto 607-8471, Japan

書誌事項

公開日
2015-07-07
資源種別
journal article
DOI
  • 10.1093/pasj/psv054
  • 10.48550/arxiv.1505.06050
公開者
Oxford University Press (OUP)

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説明

<jats:title>Abstract</jats:title> <jats:p>We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. Li is a key element to understand the evolution of the stellar convection zone, which reflects the age of solar-type stars. We performed the high-dispersion spectroscopy of solar-type superflare stars with Subaru/High Dispersion Spectrograph and confirmed that 34 stars show no evidence of binarity in our previous study. In this study, we derived the Li abundances of these 34 objects. We investigate correlations of Li abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of Li by superflares. We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. When compared with the Li abundance in the Hyades cluster, which is younger than the Sun, it is suggested that half of the observed stars are younger than Hyades cluster. The measured value of v sin i (projected rotational velocity) supports that those objects are younger than the Sun. However, there are some objects which show the low Li abundance and slowly rotate on the basis of the estimated v sin i and P (period of brightness variation). This result indicates that superflare stars are not only young stars but also old stars like our Sun. In our observations, we could not find any evidence of Li production by superflares. Further research on Li isotope abundances of superflare stars would clarify the issue of Li production by stellar flares.</jats:p>

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