Nucleosynthesis studies from the chmical abundances of superflare stars

• Project/Area Number: 26400231
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: University of Hyogo
• Principal Investigator: Honda Satoshi 兵庫県立大学, 自然・環境科学研究所, 特任助教 (20425408)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 恒星フレア / 元素合成 / リチウム / スーパーフレア / 恒星大気

Outline of Final Research Achievements

The purpose of this study is to investigate of the possibility of nucleosynthesis of elements by stellar flares from the chemical abundances of superflare stars. We performed the high-dispersion spectroscopy of 34 solar-type superflare stars with Subaru/HDS and derived the Li abundances of these objects. We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. The maximum energy and the number of the superflare also does not show any correlation with the Li abundance. In our observations, we could not find any evidence of Li production by superflares.
We could not find a clear difference between supareflare stars and our Sun. These results support the possibility that our Sun could generate supreflares.

Research Products

• [Journal Article] Time resolved spectroscopic observations of an M-dwarf flare star EV Lac during a flare (2018)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Namekata, Kosuke; Notsu, Shota; Maehara, Hiroyuki; Ikuta, Kai; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: Publications of the Astronomical Society of Japan Volume: - Issue: 4 Pages: 62-62
  • DOI: 10.1093/pasj/psy055
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spectroscopic observations of active solar-analog stars with high X-ray luminosity, as a proxy of superflare stars (2017)
  • Author(s): Notsu, Y., Honda, S., Maehara, H., Notsu, S., Namekata, K., Nogami, D., and Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 1 Pages: 12-12
  • DOI: 10.1093/pasj/psw116
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Starspot activity and superflares on solar-type stars (2017)
  • Author(s): Maehara, H., Notsu, Y., Notsu, S., Namekata, K., Honda, S., Ishii, T., T., Nogami, D., and Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中 Issue: 3 Pages: 41-41
  • DOI: 10.1093/pasj/psx013
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Statistical Studies of Solar White-light Flares and Comparisons with Superflares on Solar-type Stars (2017)
  • Author(s): Namekata, K., Sakaue, T., Watanabe, K., Asai, A., Maehara, H., Notsu, Y., Notsu, S., Honda, S., Ishii, T. T., Ikuta, K., Nogami, D., Shibata, K.
  • Journal Title: The Astrophysical Journal Volume: 851 Issue: 2 Pages: 91-91
  • DOI: 10.3847/1538-4357/aa9b34
  • Peer Reviewed
• [Journal Article] MALLSによるA, F, G, and K型スーパーフレア星の分光観測 (2016)
  • Author(s): 本田敏志、野津湧太、野津翔太、柴山拓也、幾田佳、行方宏介、鄭祥子、猪口陸子、前原裕之、野上大作、柴田一成
  • Journal Title: 兵庫県立大学天文科学センター紀要 2016年 Volume: 4 Pages: 1-9
  • NAID: 40021119819
  • Open Access / Acknowledgement Compliant
• [Journal Article] High dispersion spectroscopy of solar-type superflare stars. III. Lithium abundances (2015)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 5
  • DOI: 10.1093/pasj/psv054
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-resolution spectroscopic studies of ultra metal-poor stars found in LAMOST survey (2015)
  • Author(s): Haining Li, Wako Aoki, Gang Zhao, Satoshi Honda, Norbert Christlieb, Takuma Suda
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 5 Pages: 84-84
  • DOI: 10.1093/pasj/psv053
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Discovery of a strongly r-process enhanced extremely metal-poor star LAMOST J110901.22+075441.8 (2015)
  • Author(s): Li, Hai-Ning; Aoki, Wako; Honda, Satoshi; Zhao, Gang; Christlieb, Norbert; Suda, Takuma
  • Journal Title: Research in Astronomy and Astrophysics Volume: 15 Issue: 8 Pages: 1264-1274
  • DOI: 10.1088/1674-4527/15/8/011
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] High dispersion spectroscopy of solar-type superflare stars. II. Stellar rotation, starspots, and chromospheric activities (2015)
  • Author(s): Notsu, Yuta; Honda, Satoshi; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 3
  • DOI: 10.1093/pasj/psv002
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-dispersion spectroscopy of solar-type superflare stars. I. Temperature, surface gravity, metallicity, and vsin i (2015)
  • Author(s): Notsu, Y., Honda, S.,Maehara, H., Notsu, S., Shibayama, T., Nogami, D., Shibata, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: - Issue: 3 Pages: 32-32
  • DOI: 10.1093/pasj/psv001
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Statistical properties of superflares on solar-type stars based on 1-min cadence data (2015)
  • Author(s): Maehara, Hiroyuki; Shibayama, Takuya; Notsu, Yuta; Notsu, Shota; Honda, Satoshi; Nogami, Daisaku; Shibata, Kazunari
  • Journal Title: Earth, Planets and Space Volume: 印刷中
  • NAID: 120005756325
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] High-Resolution Spectroscopy of Extremely Metal-Poor Stars from SDSS/SEGUE. II. Binary Fraction (2015)
  • Author(s): Aoki, W., Suda, T., Beers, T. C., Honda, S.
  • Journal Title: The Astronomical Journal Volume: 149 Issue: 2 Pages: 39-39
  • DOI: 10.1088/0004-6256/149/2/39
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] G, K, M型星でのスーパーフレア (2017)
  • Author(s): 野津湧太, 前原裕之, 行方宏介, 野津翔太, 幾田佳, 本田敏志, 野上大作, 柴田一成
  • Organizer: 日本地球惑星科学連合 2017年大会
  • Int'l Joint Research
• [Presentation] 適応的交換モンテカルロ法を用いたスーパーフレア星の多次元パラメータ推定 (2017)
  • Author(s): 幾田佳, 前原裕之, 野津湧太, 行方宏介, 野津翔太, 本田敏志, 野上大作, 柴田一成
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] Spectroscopic observations of solar-type superflare stars found from Kepler short (1-min) time cadence data (2017)
  • Author(s): 野津湧太, Suzanne Hawley, 前原裕之, 本田敏志, 野津翔太, 行方宏介, 幾田佳, 野上大作, 柴田一成
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 太陽型星の巨大黒点群の時間発展 ~太陽黒点との比較~ (2017)
  • Author(s): 行方宏介, 前原裕之, 野津湧太, 野津翔太, 幾田佳, 早川尚志, 本田敏志, 野上大作, 柴田一成
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] Lithium Abundance of the Solar-Type Superflare Stars (2016)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: the 14th International Symposium on Nuclei in the Cosmos
  • Place of Presentation: Niigata, Japan
  • Year and Date: 2016-06-19
  • Int'l Joint Research
• [Presentation] Lithium Abundance Of The Solar-Type Superflare Stars (2016)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
  • Place of Presentation: Uppsala Sweden
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] Time Resolved Spectroscopic Observations of an M-Dwarf Flare Star EV Lac During a Flare. (2016)
  • Author(s): Honda, Satoshi; Notsu, Yuta; Notsu, Shota; Maehara, Hiroyuki; Namekata, Kosuke; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
  • Place of Presentation: Uppsala Sweden
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] High Dispersion Spectroscopy of Solar-Type Superflare Stars With Subaru/HDS (2016)
  • Author(s): Notsu, Yuta; Honda, Satoshi; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Namekata, Kosuke; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
  • Place of Presentation: Uppsala Sweden
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] Statistical Properties Of Superflares On Solar-Type Stars With Kepler Data (2016)
  • Author(s): Notsu, Yuta; Maehara, Hiroyuki; Shibayama, Takuya; Honda, Satoshi; Notsu, Shota; Namekata, Kosuke; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
  • Place of Presentation: Upsala Sweden
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] フレア星EVLacのHa線連続分光観測 (2016)
  • Author(s): 本田敏志, 野津湧太, 野津翔太, 前原裕之, 行方宏介, 野上大作,柴田一成
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京（東京都八王子市）
  • Year and Date: 2016-03-14
• [Presentation] スーパーフレア星のリチウム組成II (2015)
  • Author(s): 本田敏志, 野津湧太, 前原裕之, 野津翔太, 柴山拓也, 野上大作, 柴田一成
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学（兵庫県神戸市）
  • Year and Date: 2015-09-09
• [Presentation] High dispersion spectroscopy of solar-type superflare stars with Subaru/HDS (2015)
  • Author(s): Notsu, Yuta; Honda, Satoshi; Maehara, Hiroyuki; Notsu, Shota; Shibayama, Takuya; Nogami, Daisaku; Shibata, Kazunari
  • Organizer: IAU General Assembly, Meeting
  • Place of Presentation: アメリカ（Honolulu,Hawaii）
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] Searching for chemical relics of first stars with LAMOST and Subaru (2015)
  • Author(s): Li, Haining; Aoki, Wako; Zhao, Gang; Honda, Satoshi; Christlieb, Norbert; Takuma, Suda
  • Organizer: IAU General Assembly, Meeting
  • Place of Presentation: アメリカ（Honolulu, Hawaii）
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] Very Low Mass Stars with Extremely Low Metallicity in the Milky Way's Halo (2015)
  • Author(s): Aoki, Wako; Beers, Timothy C.; Takuma, Suda; Honda, Satoshi; Lee, Young Sun
  • Organizer: IAU General Assembly, Meeting
  • Place of Presentation: アメリカ（Honolulu, Hawaii）
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] 強いX線放射を示す太陽型星の岡山188cm望遠鏡での高分散分光観測 (2015)
  • Author(s): 野津湧太, 野津翔太, 本田敏志, 前原裕之, 柴山拓也, 野上大作, 柴田一成
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪大学
  • Year and Date: 2015-03-18 – 2015-03-21
• [Presentation] 強いX線放射を示すG型星の岡山188cm望遠鏡を用いた高分散分光観測 (2014)
  • Author(s): 野津湧太, 野津翔太, 本田敏志, 前原裕之, 柴山拓也, 野上大作, 柴田一成
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13