Time Variations of H 2O Maser Emission at W31A and W75S
Abstract
The results of homogeneous systematic observations of H2O masers in W31A and W75S at 1.35 cm, carried out in 1981-1993 with the 22 m radio telescope of the Radio Astronomical Station of Lebedev Physical Institute in Pushcino, are presented. Short- and long-term variations were observed. The flare activity of the masers W31A and W75S had a more or less regular character. An anticorrelation of fluxes is revealed for some of the components of and for the group of the components. The variation of the velocity of the condensation in W75S observed in the period of the highest activity of the H2O maser was due most probably to the increase of the expansion velocity of the envelope under the influence of a stellar wind.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1995
- DOI:
- 10.1086/175516
- Bibcode:
- 1995ApJ...443..222L
- Keywords:
-
- Interstellar Masers;
- Interstellar Matter;
- Periodic Variations;
- Radio Astronomy;
- Stellar Envelopes;
- Water Masers;
- Condensing;
- Correlation;
- Radiant Flux Density;
- Stellar Flares;
- Stellar Winds;
- Velocity;
- Astronomy;
- MASERS;
- ISM: INDIVIDUAL ALPHANUMERIC: W31A;
- ISM: INDIVIDUAL ALPHANUMERIC: W75S;
- RADIO CONTINUUM: ISM