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Solar-type Stars Observed by LAMOST and Kepler

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Shapiro,  Alexander
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society;

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Reinhold,  Timo
ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society;

Sowmya,  Krishnamurthy
ERC Starting Grant: Connecting Solar and Stellar Variabilities (SOLVe), Max Planck Institute for Solar System Research, Max Planck Society;

Yu,  Jie
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Zhang, J., Shapiro, A., Bi, S., Xiang, M., Reinhold, T., Sowmya, K., et al. (2020). Solar-type Stars Observed by LAMOST and Kepler. The Astrophysical Journal Letters, 894(1): L11. doi:10.3847/2041-8213/ab8795.


Cite as: http://hdl.handle.net/21.11116/0000-0006-53B2-3
Abstract
Obtaining measurements of chromospheric and photometric activity of stars with near-solar fundamental parameters and rotation periods is important for a better understanding of solar–stellar connection. We select a sample of 2603 stars with near-solar fundamental parameters from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)-Kepler field and use LAMOST spectra to measure their chromospheric activity and Kepler light curves to measure their photospheric activity (i.e., the amplitude of the photometric variability). While the rotation periods of 1556 of these stars could not be measured due to the low amplitude of the photometric variability and highly irregular temporal profile of light curves, 254 stars were further identified as having near-solar rotation periods. We show that stars with near-solar rotation periods have chromospheric activities that are systematically higher than stars with undetected rotation periods. Furthermore, while the solar level of photospheric and chromospheric activity appears to be typical for stars with undetected rotation periods, the Sun appears to be less active than most stars with near-solar rotation periods (both in terms of photospheric and chromospheric activity).