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Paper: Radial Velocity Analysis of Galactic Planetary Nebulae
Volume: 362, The Seventh Pacific Rim Conference on Stellar Astrophysics
Page: 222
Authors: Hyung, S.; Huh, S.
Abstract: The spatial distribution of the Galactic planetary nebulae (PNe) and their radial velocities were analyzed for planetary nebulae with known distances. The average radial velocities are derived from 20 × 20 sky area of the galactic plane at 6 azimuthal positions, i.e. l = 0, 45, ....., and 315. A large number of PNe are found in the solar apex direction, while a relatively small number are distributed in the solar antapex direction. Planetary nebulae at l = 90 rapidly approach the LSR or Sun (VΘ = −51.4 km s−1), while those at l = 180 recede slowly (VΘ = 6.7 km s−1). The noticeable large velocity difference in the azimuthal direction is likely to be due to the PNs' highly elongated orbits in a particular direction. Although the radial velocities relative to the Local Standard of Rest display a double sinusoidal curve, the large velocity dispersion and other evidence suggest that some interaction between the Sun and PNe exists.
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