Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l.107d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 15, 1987, p. L107-L112.
Astronomy and Astrophysics
Astrophysics
22
Ionized Gases, Magellanic Clouds, Planetary Nebulae, Stellar Evolution, Stellar Mass, White Dwarf Stars, Asymptotic Giant Branch Stars, H Beta Line, Hertzsprung-Russell Diagram, High Resolution, Line Of Sight
Scientific paper
Two new evolutionary correlations have been discovered to apply to the population of planetary nebulae (PN) in the Magellanic Clouds. First, the age of the nebular shell is found to follow a relationship, which is shown to be consistent with a model in which the total energy of the ionized and swept-up gas drives the expansion down the density gradient in the precursor AGB wind. Second, a tight correlation is found between the expansion velocity and a combination of the excitation class and the Hβ flux. This appears to be determined by the mass of the planetary nebula nuclear star. These correlations provide strong observational support for the idea that the PN shells are ejected at low velocity during the asymptotic giant branch phase of evolution, and that they are continually accelerated during their nebular lifetimes.
Dopita Michael A.
Ford Holland C.
Meatheringham Stephen J.
Morgan David H.
Webster Louise B.
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