A&A Supplement Series, Vol. 126, December I 1997, 257-266
Received June 5, 1996; accepted March 5, 1997
maser emission in the direction of the semiregular
variable RT Virginis during 1985-1996J.E. Mendoza-Torres
- E.E. Lekht
- I.I. Berulis
- M.I. Pashchenko
Send offprint request: J.E. Mendoza-Torres
Instituto Nacional de Astrofísica, Optica y Electrónica,
Apartado Postal 51 y 216, Puebla, Pue., Z.P. 72000, México
Astro-cosmic centre of Lebedev Physical Institute, Russian Academy
of Siences, Leninskij prospect 53, 117912, Moscow, Russia
Technological University, Kaunas, Lithuania
Sternberg Astronomical Institute, Universitetsky prospect 13, 119899,
Moscow, Russia
We present a catalog of the 22 GHz 
maser profiles of the semiregular
variable RT Vir. The observations were made from 1985 to 1996 at the RT-22 radio
telescope of the Radio Astronomical Station at Pushchino, Russia. Results obtained
after the analysis of the integrated fluxes, the average spectra, the centroid
velocity and the superposition of the spectra are reported.
Anticorrelation of the integrated fluxes of two spectral intervals
(
and 
) was found. The
characteristic time variation of the maser emission at each of these groups
was about 5-6 years. This phenomenon may be explained by a variation of the
outflow of the matter from the star. The outflow is weakly bipolar. We can
suppose that in such a model the enhancement of the outflow occured
alternately with a period of about 5-6 years. The anticorrelation of the
integrated fluxes of two groups of maser features, located symmetrically
relative to the star, may be a result of this alternation.
keywords: RT Vir -- radio lines: masers -- stars: variables: other