$\mathrm{H}{\alpha }$ chromospheric activity of F-, G-, and K-type stars observed by the LAMOST medium-resolution spectroscopic survey

He, Hongliang; Zhang, Weitao; Zhang, Haotong; Wang, Song; Luo, A-Li; Zhang, Jun

doi:10.1007/s10509-023-04219-w

Cited by 4 publications

(2 citation statements)

References 81 publications

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“…It is important to build large databases to statistically understand the physical mechanisms of stellar magnetic activity. As part of this effort, we have previously established large sample databases for solar-like stars' activity utilizing Ca II H and K (Zhang et al 2022) and H α (He et al 2023) indices based on LAMOST spectra. In this study, we will build a stellar-activity database of F, G, and K stars based on the measurements of Ca II IRT lines.…”

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confidence: 99%

“…He et al (2023) measured the R H a index using LAMOST MRS;Zhang et al (2022) established a Ca II H and K S index database based on the LAMOST Low-Resolution Spectroscopic Survey (LRS);Karoff et al (2016) explored superflares using the S index along with Kepler light-curve data and found that superflare stars are characterized by enhanced activity;Zhang et al (2019) proposed that stellar chromospheric activity indices can be used to roughly estimate stellar ages for dwarfs.…”

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The Near-infrared Ca ii Triplet as a Stellar Activity Indicator: A Library and Comparative Study

Huang 黄,

He 何,

Bai 白

et al. 2024

ApJS

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We have established and released a new stellar index library of the Ca ii triplet, which serves as an indicator for characterizing the chromospheric activity of stars. The library is based on data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low-Resolution Spectroscopic Survey (LRS) Data Release 9. To better reflect the chromospheric activity of stars, we have defined new indices R and R +. The library includes measurements of R and R + for each Ca ii infrared triplet (IRT) from 699,348 spectra of 562,863 F, G, and K-type solar-like stars with a signal-to-noise ratio higher than 100, as well as the stellar atmospheric parameters and basic information inherited from the LAMOST LRS catalog. We compared the differences between the three individual indices of the Ca ii triplet and also conducted a comparative analysis of R λ 8542 + to the Ca ii H and K S and R HK + index databases. We observe the fraction of less active stars decreases with T eff and the fraction of more active stars first decreases with decreasing temperature and turns to increase with decreasing temperature at 5800 K. We also find that a significant fraction of stars that show a high activity index in both Ca ii H and K and IRT are binaries with low activity; some of them could be discriminated in the Ca ii H and K S index and R λ 8542 + space. This new stellar library serves as a valuable resource for studying chromospheric activity in stars and can be used to improve our comprehension of stellar magnetic activity and other astrophysical phenomena.

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confidence: 99%

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The Near-infrared Ca ii Triplet as a Stellar Activity Indicator: A Library and Comparative Study

Huang 黄,

He 何,

Bai 白

et al. 2024

ApJS

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Intensities of the hydrogen Balmer lines of solar-like stars revealed by the LAMOST spectroscopic surveys

2024

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Stellar chromospheric activity database of solar-like stars based on the LAMOST Low-Resolution Spectroscopic Survey

Zhang,

et al. 2024

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The dependence of stellar magnetic activity on stellar parameters is inspired by the chromospheric activity studies based on the large-scale spectroscopic surveys. The main objective of this project is to provide the chromospheric activity parameter database for the LAMOST Low-Resolution Spectroscopic Survey (LRS) spectra of solar-like stars and explore the overall property of stellar chromospheric activity. The Ca II H and K lines were employed to construct indicators for assessing and studying the chromospheric activity of solar-like stars. We investigated the widely used bolometric- and photospheric-calibrated chromospheric activity index $R'_ HK $, derived from the method in the classic literature ($R'_ HK,classic $) and the method based on the PHOENIX model ($R'_ HK,PHOENIX $). Since the detailed stellar atmospheric parameters, effective temperature ($T_ eff $), surface gravity ($ and metallicity Fe/H ) are available for LAMOST, we estimated the chromospheric activity index $R'_ HK,PHOENIX $, along with the corresponding bolometric calibrated index $R_ HK,PHOENIX $, taking these parameters into account. We provided the database of the derived chromospheric activity parameters for 1,122,495 LAMOST LRS spectra of solar-like stars. Our calculations show that $ HK,PHOENIX $ is approximately linearly correlated with $ HK,classic K

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$\mathrm{H}{\alpha }$ chromospheric activity of F-, G-, and K-type stars observed by the LAMOST medium-resolution spectroscopic survey

Cited by 4 publications

References 81 publications

The Near-infrared Ca ii Triplet as a Stellar Activity Indicator: A Library and Comparative Study

The Near-infrared Ca ii Triplet as a Stellar Activity Indicator: A Library and Comparative Study

Intensities of the hydrogen Balmer lines of solar-like stars revealed by the LAMOST spectroscopic surveys

Stellar chromospheric activity database of solar-like stars based on the LAMOST Low-Resolution Spectroscopic Survey

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