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Based on an extensive spectral study of a photometrically confirmed sample ofMira variables, we find a relationship between relative Balmer emission-linestrength and spectral temperature of O-rich Mira stars. The $F_{\rmH\delta}/F_{\rm H\gamma}$ flux ratio increases from less than unity to five asstars cool down from M0 to M10, which is likely driven by increasing TiOabsorption above the deepest shock-emitting regions. We also discuss therelationship between the equivalent widths of the Balmer emission lines and thephotometric luminosity phase of our Mira sample stars. Using our 291 Miraspectra as templates for reference, 191 Mira candidates are newly identifiedfrom the LAMOST DR4 catalog. We summarize the criteria adopted to select Miracandidates based on emission-line indices and molecular absorption bands. Thisenlarged spectral sample of Mira variables has the potential to contributesignificantly to our knowledge of the optical properties of Mira stars and willfacilitate further studies of these late-type, long-period variables.

Mira Variable Stars From LAMOST DR4 Data: Emission Features, Temperature Types, and Candidate Selection