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

<p>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&nbsp;effective temperature ranging from 4800 K to 6800 K. We measure the mean fluxes at line cores of the Ca II H&amp;K lines using a 1 &Aring; rectangular bandpass as well as a 1.09 &Aring; full width at half maximum (FWHM) triangular bandpass, and the mean fluxes of two 20 &Aring; pseudo-continuum bands on the two sides of the lines. Three chromospheric activity indexes,&nbsp;<em>S</em>_rec based on the 1 &Aring; rectangular bandpass, and&nbsp;<em>S</em>_tri&nbsp;and&nbsp;<em>S</em>_MWL based on the 1.09 &Aring; FWHM triangular bandpass, are evaluated from the measured fluxes. The uncertainties of all the obtained parameters are estimated. We also produce spectrum diagrams of Ca II H&amp;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.</p> <p>&nbsp;</p> <p>The entity of the database is composed of (1) a catalog of spectral sample and activity parameters, and (2) a library of spectrum diagrams.</p> <p>(1) Catalog of Spectral Sample and Activity Parameters<br> CaIIHK_Sindex_LAMOST_DR7_LRS.csv</p> <p>(2) Library of Spectrum Diagrams<br> spectrum_diagrams_000-049.zip&nbsp; (46 subfolders)<br> spectrum_diagrams_050-099.zip&nbsp; (40 subfolders)<br> spectrum_diagrams_100-149.zip&nbsp; (47 subfolders)<br> spectrum_diagrams_150-199.zip&nbsp; (49 subfolders)<br> spectrum_diagrams_200-249.zip&nbsp; (47 subfolders)<br> spectrum_diagrams_250-299.zip&nbsp; (45 subfolders)<br> spectrum_diagrams_300-349.zip&nbsp; (41 subfolders)<br> spectrum_diagrams_350-399.zip&nbsp; (39 subfolders)<br> spectrum_diagrams_400-449.zip&nbsp; (45 subfolders)<br> spectrum_diagrams_450-499.zip&nbsp; (35 subfolders)<br> spectrum_diagrams_500-549.zip&nbsp; (27 subfolders)<br> spectrum_diagrams_550-599.zip&nbsp; (38 subfolders)<br> spectrum_diagrams_600-649.zip&nbsp; (32 subfolders)<br> spectrum_diagrams_650-699.zip&nbsp; (26 subfolders)<br> spectrum_diagrams_700-749.zip&nbsp; (28 subfolders)</p>