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. Márquez, J.E. Mendoza-Torres, and E.E. Lekht

Send offprint request: E.E. Lekht

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

Abstract:

Results are presented of the analysis of 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 during 1981-1988 and 1990-1996 is observed. In 1989 a fast jump of this parameter from -0.3 to 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

• 1. Introduction
• 2. Presentation of the results
• 3. Discussion
• 4. Conclusions
• References