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We present a catalog of the 22 GHz H2 Om aser proles of the semiregular variable RT Vir. The observa- tions were made from 1985 to 1996 at the RT-22 radio telescope of the Radio Astronomical Station at Pushchino, Russia. Results obtained after the analysis of the inte- grated fluxes, the average spectra, the centroid velocity and the superposition of the spectra are reported. Anticorrelation of the integrated fluxes of two spectral intervals (VLSR 21 km s 1 ) was found. The characteristic time variation of the maser emission at each of these groups was about 5-6 years. This phe- nomenon may be explained by a variation of the outflow of the matter from the star. The outflow is weakly bipolar. We can suppose that in such a model the enhancement of the outflow occured alternately with a period of about 5-6 years. The anticorrelation of the integrated fluxes of two groups of maser features, located symmetrically relative to the star, may be a result of this alternation.

Evolution of H2O maser emission in the direction of the semiregular variable RT Virginis during 1985-1996

Evolution of H₂O maser emission in the direction of the semiregular variable RT Virginis during 1985-1996