Kinematic study of southern planetary nebulae

Details Kinematic study of southern planetary nebulae Kinematic study of southern planetary nebulae

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....40..415a&link_type=abstract

Astronomy and Astrophysics, vol. 40, no. 4, May 1975, p. 415-420. In French.

Astronomy and Astrophysics

Astrophysics

15

Kinematics, Planetary Nebulae, Radial Velocity, Astronomical Catalogs, Astronomical Spectroscopy, Elliptical Orbits, Velocity Distribution

Scientific paper

Radial velocities of forty planetary nebulae (PN) have been determined from 74 spectra taken at 74 A/mm and 4 spectra taken at 20 A/mm. The qualitative intensity of measured lines allows the excitation class of the PN to be determined. In addition, internal velocities have been evaluated for some of the PN, and the expansion velocity of NGC 5189 was found to be about 36 km/s. The agreement between the observed velocities and those calculated from purely circular motion was analyzed, using the distances given by Cahn and Kaler (1971). A mean residual velocity of 36 km/s was found for the PN belonging to the disk population. Some of the large differences observed can be explained in terms of overestimated distances (optically thick nebulae), underestimated distances (stellar-like nebulae) and elliptical orbits (objects located in the direction of the galactic center).

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