Astron. Astrophys. Suppl. Ser.
Volume 128, Number 1, February II 1998
|Page(s)||1 - 6|
|Published online||15 February 1998|
Variation of spectral features in the ON2 water maser
Instituto Nacional de Astrofisica, Óptica y Electrónica, Apartado Postal 51 y 216, Puebla, Pue., Z.P. 72000, México
2 Sternberg Astronomical Institute, Universitetsky prospect 13, 119899, Moscow, Russia
Send offprint request to: E.E. Lekht
Accepted: 30 May 1997
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.
Key words: ISM: ON2 / masers / radio lines: ISM
© European Southern Observatory (ESO), 1998