Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..602k&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 602-606.
Astronomy and Astrophysics
Astrophysics
7
Planetary Nebulae, Radial Velocity, Star Distribution, Stellar Evolution, Abundance, Data Reduction, Disk Galaxies, H Lines, Lyman Spectra, Optical Thickness, Stellar Mass
Scientific paper
The paper presents line fluxes, radial velocities, and analyses of two large Abell-type planetaries that show marked contrasts. Abell 43 is a high-excitation galactic-disk, or Population I, nebula that is optically thin in the hydrogen Lyman continuum. Abell 50 is a medium-excitation, optically thick, Population II (high velocity) object. Although the two nebulae are of similar size (radius greater than 0.2 pc), which in a simple theory might imply a similar evolutionary state, the central star of A43 appears to be much more luminous than that of A50. The set of large nebulae does not constitute a homogeneous evolutionary class in which the stars can be linked by a monotonic evolutionary track. The comparisons between these two objects illustrate and perhaps epitomize very large differences among large planetaries which probably involve differences in population type, and in stellar and nebular masses.
Hartkopf William I.
Kaler James B.
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