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Chromospheric activities of pre-main-sequence stars

Published online by Cambridge University Press:  23 December 2024

Mai Yamashita Open the ORCID record for Mai Yamashita [Opens in a new window] ,
Yoichi Itoh ,
Yuhei Takagi  and
Yumiko Oasa
Mai Yamashita*
Affiliation:
Nishi–Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo, Sayo, Hyogo, Japan
Yoichi Itoh
Affiliation:
Nishi–Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, 407-2 Nishigaichi, Sayo, Sayo, Hyogo, Japan
Yuhei Takagi
Affiliation:
Subaru Telescope, National Astoronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720, U.S.A.
Yumiko Oasa
Affiliation:
Faculty of Education, Saitama University, 255 Shimo–Okubo, Sakura, Saitama, Saitama, Japan
*
email: [email protected]
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Abstract

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We investigated chromospheric activities of pre-main-sequence (PMS) stars. First, we studied the Ca II infrared triplet emission lines with Subaru/HDS and other spectroscopic instruments. Most PMS stars have narrow Ca II lines whose intensities are as large as the maximum of the zero-age main-sequence (ZAMS) stars. The chromosphere of PMS stars is suggested to be filled by the Ca II emitting region. Second, we found many faint chromospheric emission lines such as Mg I and Fe I for more than half of the ZAMS stars. Third, we searched the periodic light variation caused by a starspot for the 26 PMS stars. Their TESS light variations and Ca II emission line strengths show the positive correlation, and are located on the extensions of the superflare stars. In summary, PMS stars have very active chromosphere driven by strong dynamo process due to the fast rotation and the long convection timescale.

Keywords

stars: pre-main sequencestars: chromospheresstars: activitytechniques: spectroscopictechniques: photometric
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 368 - 374
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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