Evolution of large planetary nebulae and their central stars
Journal Article
·
· Astrophys. J.; (United States)
New absolute and relative line fluxes are presented for 57 large planetary nebulae, defined here as having maximum radii greater than 0.175 pc. H and He ii Zanstra temperatures and luminosities, with a full evaluation of the errors, are calculated for the central stars of these nebulae and for the 25 additional objects for which the appropriate data are available. The ratios of the H and He ii temperatures are used to establish whether or not the nebulae are optically thick in the H and He/sup +/ Lyman continua, and consequently to determine in which cases the derived values of T and L may only be limits. The full set of central stars is plotted on the log L-log T plane for comparison with theoretical evolutionary tracks.
- Research Organization:
- Astronomy Department, University of Illinois
- OSTI ID:
- 5542831
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 271:1; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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