Detection of a possible bipolar outflow around the semi-regular variable star R Crateris by the Japanese VLBI Network (J-Net)

Details Detection of a possible bipolar outflow around the semi-regular variable star R Crateris by the Japanese VLBI Network (J-Net) Detection of a possible bipolar outflow around the semi-regular variable star R Crateris by the Japanese VLBI Network (J-Net)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..319i&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

Water Vapor Masers, Agb Stars, R Crateris

Scientific paper

We have monitored water vapor masers around the semi-regular variable star R Crateris (R Crt) with the Japanese VLBI Network (J-Net) at the 22 GHz band at four epochs with intervals of one month. With a typical positional accuracy of 0.5 mas in the R.A. and 0.6 mas in the declination directions, and with a velocity resolution of 0.105 km s-1, we were able to measure twelve relative proper motions and radial-velocity drifts of maser features. The 3-D kinematics of the features indicates a bipolar expanding flow. The major axis of the asymmetric flow was estimated to be at P.A.=136°. The existence of a bipolar outflow suggests that an evolved star had already formed a bipolar outflow at the early phase of the AGB star.

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