Dynamics of the circumstellar envelope of RT Virginis on the basis of the H_2O maser monitoring

Details Dynamics of the circumstellar envelope of RT Virginis on the basis of the H_2O maser monitoring Dynamics of the circumstellar envelope of RT Virginis on the basis of the H_2O maser monitoring

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...343..241l&link_type=abstract

Astronomy and Astrophysics, v.343, p.241-250 (1999)

Astronomy and Astrophysics

Astrophysics

13

Masers, Stars: Circumstellar Matter, Stars: Individual: Rt Vir, Radio Lines: Stars

Scientific paper

This paper continues the earlier work (Mendoza-Torres et al. 1997) on single-dish 22-GHz observations of the H_2O maser associated with the semiregular variable (SRb-type) RT Vir. New spectra, obtained in 1996-1998, are presented, and an analysis of the emission of individual spectral features during the interval of 1986-1998 is performed. All the observations have been carried out on the RT-22 radio telescope of the Pushchino Radio Astronomy Observatory, Lebedev Institute of Physics, Russian Academy of Sciences. As a result of long-term monitoring, the character of variability of multiple spectral components was traced in detail. For many features, a drift in radial velocity was found. There are time intervals with preferential drift direction of the majority of the spectral features. This trend was the most pronounced at velocities <15.5 km s(-1) . Possible causes of the drift observed are discussed. From a superposition of all the spectra and from the mean spectrum for 1984-1998, stellar velocity V_* was determined. It is estimated as 17.3+/-0.2 km s(-1) . The time interval from March to June 1998 is considered as the period of maximum activity of the H_2O maser RT Vir during the entire timespan of its observations.

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