## 5. Basic equations## 5.1. Case of axial symmetryRadial velocities of the expanding equatorial ring and polar blobs
determined spectroscopically and tangential velocities determined from
the HST or radio images can be used simultaneously for calculation of
the true expansion velocities The most important parameter - the inclination angle The ratio of radial velocities can be found directly from
spectroscopic observations. The ratio of tangential velocities is
identical to the ratio of expansion rates for the blobs and ring
determined in Fig. 7. If the inclination angle
## 5.2. Non-axially symmetric caseIn this case the inclination angle of the ring The two inclination angles ## 5.3. Spherical envelope with outflow in polar regionThe basic equations are modified as follows: The inclination angle can be calculated using the equation © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 |