Long-Period Variability of H₂O Maser Emission Associated
with Star-forming Regions

E. E. Lekht

Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899 Russia

Instituto Nacional de Astrofìsica, Óptica y Electrónica, Tonantzintla, Mexico

Received November 14, 1995

Abstract—The evolution of long-period variations of H₂O maser emission in nine sources associated with star-
forming regions is examined. The variability in the total flux and weighted mean radial velocity is analyzed.
An interpretation of some types of variability is suggested in the framework of an accretion model for star
formation.

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