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A&A Supplement series, Vol. 128, February II 1998, 1-6

Received September 23, 1996; accepted May 30, 1997

Variation of spectral features in the ON2 water maser

A. Márqueztex2html_wrap837, J.E. Mendoza-Torrestex2html_wrap837, and E.E. Lekht tex2html_wrap841

Send offprint request: E.E. Lekht

tex2html_wrap843  Instituto Nacional de Astrofısica, Óptica y Electrónica, Apartado Postal 51 y 216, Puebla, Pue., Z.P. 72000, México
tex2html_wrap845  Sternberg Astronomical Institute, Universitetsky prospect 13, 119899, Moscow, Russia


Results are presented of the analysis of tex2html_wrap_inline817 maser spectra in ON2, obtained with the RT-22 radio telescope at Pushchino during 1981-1996. The spectral features are analyzed and their time evolution examined. Anticorrelation between the fluxes of features with close radial velocities is found. A systematic displacement of the drifts sum of all features from 0.8 to tex2html_wrap_inline819 during 1981-1988 and 1990-1996 is observed. In 1989 a fast jump of this parameter from -0.3 to tex2html_wrap_inline823 took place. The quadratic sum of the drifts of the features always increased during a rise in maser activity. Possible causes of the observed phenomena are discussed.

keywords: ISM: ON2 -- masers -- radio lines: ISM

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