Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..313i&link_type=abstract
In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M
Astronomy and Astrophysics
Astrophysics
Masers, Semiregular Variables, Pulsation, Rt Vir
Scientific paper
We report multi-epoch Very Long Baseline Array (VLBA) observations of water masers around the semiregular variable RT Virginis (RT Vir). The 3-D kinematics of 61 maser features describes a circumstellar envelope expanding roughly spherically with a velocity of ~10 km s-1. Systematic radial-velocity drifts of masers were found with amplitudes of around 1 km s-1yr-1. From one maser feature, a quadratic position shift was discovered with an acceleration rates of 33 km s-1yr-1, implying a passage of a shock wave driven by the stellar pulsation. We estimated a distance to RT Virginis of ~220 pc on the basis of the statistical parallax and the model-fitting methods.
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