On the kinematics of galactic planetary nebulae

Details On the kinematics of galactic planetary nebulae On the kinematics of galactic planetary nebulae

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979afz....15..105k&link_type=abstract

(Astrofizika, vol. 15, Jan.-Mar. 1979, p. 105-119.) Astrophysics, vol. 15, no. 1, July 1979, p. 63-72. Translation.

Astronomy and Astrophysics

Astrophysics

4

Celestial Mechanics, Galactic Rotation, Kinematics, Milky Way Galaxy, Planetary Nebulae, Centroids, Circular Orbits, Parallax, Radial Velocity, Random Errors, Solar Position, Statistical Analysis, Velocity Distribution

Scientific paper

The classical method of determining the components of the solar motion relative to the centroid of the system of planetary nebulae with known radial velocities is investigated. It is shown that this method is insensitive to random errors in the radial velocities and that low accuracy in determining the coordinates of the solar apex and motion results from the insufficient number of planetaries with measured radial velocities. The planetary nebulae are found not to satisfy well the law of differential galactic rotation with circular orbits; this is attributed to the elongation of their galactic orbits. A method for obtaining the statistical parallax of planetary nebulae is considered, and the parallax calculated from the tau components of their proper motion is shown to be the most reliable.

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