VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris

Details VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris

2001-12-13

arxiv.org/abs/astro-ph/0112302v1

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, Accepted for publication in PASJ (2001), preprint can be obtained via WWW on http://www.nro.nao.ac.jp/l

Scientific paper

We monitored water-vapor masers around the semi-regular variable star R Crateris with the Japanese VLBI Network (J-Net) at the 22 GHz band during four epochs with intervals of one month. The relative proper motions and Doppler-velocity drifts of twelve maser features were measured. Most of them existed for longer than 80 days. 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 degrees. The existence of a bipolar outflow suggests that a Mira variable star had already formed a bipolar outflow. The water masers are in a region of apparent minimum radii of 1.3 x 10^12 m and maximum radii of 2.6 x 10^12 m, between which the expansion velocity ranges from 4.3 to 7.4 km/s. These values suggest that the water masers are radially accelerated, but still gravitationally bound, in the water-maser region. The most positive and negative velocity-drifting features were found relatively close to the systemic velocity of the star. We found that the blue-shifted features are apparently accelerated and the red-shifted apparently decelerated. The acceleration of only the blue-shifted features seems to be consistent with that of the expanding flow from the star.

Affiliated with

Also associated with

No associations

Rating

VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VLBI Monitoring Observations of Water Masers Around the Semi-Regular Variable Star R Crateris will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-425298