| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 128, Number 1, February II 1998
|
|
|---|---|---|
| Page(s) | 1 - 6 | |
| DOI | https://doi.org/10.1051/aas:1998124 | |
| Published online | 15 February 1998 | |
Variation of spectral features in the ON2 water maser
1
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
Received:
23
September
1996
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