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  Magnetic Activity of F-, G-, and K-type Stars in the LAMOST–Kepler Field

Zhang, J., Bi, S., Li, Y., Jiang, J., Li, T., He, H., et al. (2020). Magnetic Activity of F-, G-, and K-type Stars in the LAMOST–Kepler Field. The Astrophysical Journal Supplement Series, 247(1): 9. doi:10.3847/1538-4365/ab6165.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F518-B Version Permalink: http://hdl.handle.net/21.11116/0000-0006-F519-A
Genre: Journal Article

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 Creators:
Zhang, Jinghua, Author
Bi, Shaolan, Author
Li, Yaguang, Author
Jiang, Jie, Author
Li, Tanda, Author
He, Han, Author
Yu , Jie1, Author
Khanna, Shourya, Author
Ge, Zhishuai, Author
Liu, Kang, Author
Tian, Zhijia, Author
Wu, Yaqian, Author
Zhang, Xianfei, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: Monitoring chromospheric and photospheric indexes of magnetic activity can provide valuable information, especially the interaction between different parts of the atmosphere and their response to magnetic fields. We extract chromospheric indexes, S and R-HK(+), for 59,816 stars from LAMOST spectra in the LAMOST-Kepler program, and photospheric index, R-eff, for 5575 stars from Kepler light curves. The log Reff shows positive correlation with log R-HK(+). We estimate the power-law indexes between Reff and R-HK(+) for F-, G-, and K-type stars, respectively. We also confirm the dependence of both chromospheric and photospheric activity on stellar rotation. Ca II H and K emissions and photospheric variations generally decrease with increasing rotation periods for stars with rotation periods exceeding a few days. The power-law indexes in exponential decay regimes show different characteristics in the two activity-rotation relations. The updated largest sample including the activity proxies and reported rotation periods provides more information to understand the magnetic activity for cool stars.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4365/ab6165
 Degree: -

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Title: The Astrophysical Journal Supplement Series
Source Genre: Journal
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Publ. Info: London : IOP Publishing
Pages: - Volume / Issue: 247 (1) Sequence Number: 9 Start / End Page: - Identifier: ISSN: 0067-0049
CoNE: https://pure.mpg.de/cone/journals/resource/954922828211_1