Statistical Properties of Stellar H2O Masers --- Results of Three-Year Single-Dish Observations with the VERA Iriki Telescope

Details Statistical Properties of Stellar H2O Masers --- Results of Three-Year Single-Dish Observations with the VERA Iriki Telescope Statistical Properties of Stellar H2O Masers --- Results of Three-Year Single-Dish Observations with the VERA Iriki Telescope

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60.1077s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.5, pp.1077--1131

Other

8

Masers, Stars: Late Type, Stars: Mass Loss, Stars: Variables: Other

Scientific paper

We report on the results of monitoring observations of 242 stellar H2O masers, which have been made with the Iriki 20m telescope of the VLBI Exploration of Radio Astrometry (VERA) from 2003 July to 2006 November. The present paper mainly focuses on 85 stellar H2O masers that have been tightly observed with a time spacing of typically 1--2 months. In particular, 46 masers out of them have been recognized concerning their periodic flux variation and have light-curve data of stellar visual light. Thus, the present paper shows some statistical views of the observed time variability properties of stellar H2O masers. We found a good correlation between a time delay of the variation in the H2O masers flux with respect to that in the stellar visual light and the stellar pulsation period. The corresponding phase lags are mildly scattered, but are mainly concentrated in the range, 0.7 ≤ Δφ ≤ 1.5. We also measured line-of-sight velocity drifts of the individual spectral peaks of H2O maser emission, which indicate radial acceleration of mass-loss outflows from the evolved stars. We discuss possible pulsation-driven shock waves that are enhanced near the stellar surface, and are propagating outwards in the circumstellar envelope.

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