Stellar chromospheric activity spectral database of solar-type stars based on the LAMOST Low-Resolution Spectroscopic Survey(disused)

A stellar chromospheric activity spectral database of solar-type stars is constructed based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low-Resolution Spectroscopic Survey (LRS). The database contains 1,330,654 high-quality LRS spectra of solar-type stars with Teff ranging from 4800 K to 6800 K. We measure the mean fluxes at line cores of the Ca II H&K lines using a 1 Å rectangular bandpass as well as a 1.09 Å full width at half maximum (FWHM) triangular bandpass, and the mean fluxes of two 20 Å pseudo-continuum bands on the two sides of the lines. Three chromospheric activity indexes, Srec using the rectangular bandpass, and Stri and SMWL using the triangular bandpass, are evaluated based on the measured fluxes. The uncertainties of all the obtained parameters are estimated. We also produce spectrum diagrams of Ca II H&K lines for all the spectra in the database. This database with more than one million high-quality LAMOST LRS spectra and basal chromospheric activity parameters can be further used for investigating activity characteristics of solar-type stars and solar-stellar connection. The entity of the database is composed of (1) a catalog of spectral sample and activity parameters, and (2) a library of spectrum diagrams. (1) Catalog of Spectral Sample and Activity Parameters CaIIHK_Sindex_LAMOST_DR7_LRS.csv (2) Library of Spectrum Diagrams spectrum_diagrams_000-049.zip (46 subfolders) spectrum_diagrams_050-099.zip (40 subfolders) spectrum_diagrams_100-149.zip (47 subfolders) spectrum_diagrams_150-199.zip (49 subfolders) spectrum_diagrams_200-249.zip (47 subfolders) spectrum_diagrams_250-299.zip (45 subfolders) spectrum_diagrams_300-349.zip (41 subfolders) spectrum_diagrams_350-399.zip (39 subfolders) spectrum_diagrams_400-449.zip (45 subfolders) spectrum_diagrams_450-499.zip (35 subfolders) spectrum_diagrams_500-549.zip (27 subfolders) spectrum_diagrams_550-599.zip (38 subfolders) spectrum_diagrams_600-649.zip (32 subfolders) spectrum_diagrams_650-699.zip (26 subfolders) spectrum_diagrams_700-749.zip (28 subfolders)