Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-10-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
6 pages, 5 figures
Scientific paper
The majority of the observed planetary nebulae exhibit elliptical or bipolar structures. Theoretical modeling has indicated that magnetically collimated jets may be responsible for the formation of the non-spherical planetary nebulae. The aim of this project is to measure the Zeeman splitting caused by the magnetic field in the OH and H2O maser regions occurring in the circumstellar envelope and bipolar outflow of the evolved star W43A. We report a measured magnetic field of approximately 100 micro-gauss in the OH maser region of the circumstellar envelope around W43A. The GBT observations reveal a magnetic field strength B|| of ~30 mG changing sign across the H2O masers at the tip of the red-shifted lobe of the bipolar outflow. We also find that the OH maser shell shows no sign of non-spherical expansion and that it probably has an expansion velocity that is typical for the shells of regular OH/IR stars. The GBT observations confirm that the magnetic field collimates the H2O maser jet, while the OH maser observations show that a strong large scale magnetic field is present in the envelope surrounding the W43A central star. The magnetic field in the OH maser envelope is consistent with the one extrapolated from the H2O measurements, confirming that magnetic fields play an important role in the entire circumstellar environment of W43A.
Amiri Nikta
van Langevelde Hubrecht Jan
Vlemmings Wouter H. T.
No associations
LandOfFree
The magnetic field of the evolved star W43A 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 The magnetic field of the evolved star W43A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The magnetic field of the evolved star W43A will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-718488