2025ApJS..281...39X

In the early stages of their lives, young stars harbor diverse processes exhibiting strong signatures, making them ideal targets for investigating stellar accretion, dynamo actions, and exoplanet formation. However, the current samples of active stars are highly limited in both number and parameter space, suffering from significant statistical uncertainties. By simultaneously measuring the activity proxy, the Balmer Hα 6563 Å line emission, and the youth indicator, the lithium 6708 Å line, with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra, we have identified more than 1000 candidates of active young stars (aYSs) with T_eff ≤ 7000 K and ${\rm{log}}g\,\geqslant \,3.5$ in the Kepler prime field. Then we matched 660 stars with the Kepler light curves, and determined their periods and variable types. Based on these light curves, we are left with 78 dubious and 52 stable stars, and we have identified 22 eclipsing binaries, 3 heartbeat binaries, 1 transiting exoplanetary system candidate, 13 long-period variables, 61 pulsating stars, 18 irregular variables, 57 T Tauri stars, 173 flaring stars, and 435 rotational variables (the numbers are not exclusive). Supplementing the cluster-based samples, this sample has a broader parameter space coverage. This work will be beneficial for identifying aYSs in much larger datasets, such as the one produced by crossmatching between the LAMOST and Transiting Exoplanet Survey Satellite surveys, and the future survey conducted by the Chinese Space Station Survey Telescope.