Abstract
The kinematics of planetary nebulae (PNe) and HII regions in the irregular galaxy NGC 6822 is analyzed through high resolution spectroscopy from LCO-Clay-MIKE and OAN-2.1m-MES telescopes-spectrographs. The data have a resolution better than 10 km/s. The heliocentric radial velocities of these objects are compared to the kinematics of the extended HI disk found in this galaxy. The analysis shows that HII regions and other members of the young stellar population follow closely the rotation of the HI disk. On the contrary, PNe are not moving along with the HI gas and their kinematics is closer to the behavior of the spheroid of C stars, which is a system with different spatial distribution and kinematics. Thus we confirm that NGC 6822 has at least two very different kinematical systems with different spatial distribution: the rotating HI disk where the young population resides, and the stellar spheroid containing the intermediate-old population.
