Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey III. Calibrating the Chromospheric Basal Flux and the Connection to Stellar Rotation

Weitao Zhang, Han He, Jun Zhang

Based on the Ca\,II H and K lines observed by LAMOST, we employ the photospheric ($R_{\mathrm{HK}}^{\prime }$) and basal ($R_{\mathrm{HK},\mathrm{L}}^{+}$) flux calibrated chromospheric activity indices to exam…