Active young stars in LAMOST-Kepler

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 H{alpha}6563{AA} line emission, and the youth indicator, the lithium 6708{AA} 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 Teff<=7000K and logg>=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).