Some Dependences for Long-Period Variables and a Possible Scheme of Their Evolution
Some dependences between the parameters for approximately 150 stars, of which 81 are sources of roaser emission in molecular lines, are constructed. The following parameters are considered: period P, asymmetry (M-m) of the visual light curve, visual amplitude A, color index (I-K). We use the data of the General Catalogue of Variable Stars. For the stars Z Cyg, R Tau, R Peg, RT Vir, RX Boo, PZ Cas, U Her, and R Cas, some parameters were determined by the authors.