Two-component velocity system of planetary nebulae

Details Two-component velocity system of planetary nebulae Two-component velocity system of planetary nebulae

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1752g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, May 1991, p. 1752-1755. National Astronomy and Ionosphere Center-supported rese

Statistics

Computation

3

Planetary Nebulae, Velocity Distribution, Computational Astrophysics, Infrared Stars, Stellar Evolution

Scientific paper

Two phenomena are discussed in the behavior of the expansion velocities of galactic planetary nebulae: (1) the distribution curve of the number N of planetary nebulae with their expansion velocity 2V(0) shows two clear maxima I: 2V(0) = 30 km/s and II: 2V(0) = 80 km/s; and (2) the averaged expansion velocities of planetary nebulae is not constant in all distances z from the galactic plane, but slowly increase with increasing z. Particularly, the 'dispersion' factor beta in the exponential law with z for these subsystems is found to be beta(A) = 280 pc and beta(B) = 430 pc. A possible explanation of these effects may be that planetary nebulae originate from two distinct types of progenitor stars.

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