Core masses and abundances of low-excitation planetary nebulae in the Magellanic Clouds

James B. Kaler, George H. Jacoby

Research output: Contribution to journalArticlepeer-review

Abstract

We derive core masses and chemical compositions for luminous low-excitation planetary nebulae in the Magellanic Clouds. They are all on horizontal (heating) evolutionary tracks with core masses that concentrate between 0.55 and 0.6 M, and have low He/H and N/O ratios as expected from the relation found by Kaler & Jacoby. The behavior of carbon with core mass is uncertain, but it seems consistent with the behavior of carbon stars. There is also a suggestion that C/O anticorrelates with N/O. Below 0.63 M, O/H correlates positively with core mass. In combination with Kaler & Jacoby, Dopita & Meatheringham, and Aller et al., we now have accurate core masses for 80 planetaries in the Magellanic Clouds. Of these, 33 are members of a bright sample, defined as the set of 50 that fall in the top 1.5 mag of the [O III] luminosity function. We find excellent agreement between the core mass distribution of this group and the prediction of Jacoby that [O III]-bright planetaries have a very narrow Gaussian high-mass cutoff. The distribution of core masses on the log L-log T plane is qualitatively consistent with theoretical evolutionary rates.

Original languageEnglish (US)
Pages (from-to)134-142
Number of pages9
JournalAstrophysical Journal
Volume382
Issue number1
DOIs
StatePublished - Nov 20 1991

Keywords

  • Galaxies: Magellanic Clouds
  • Nebulae: abundances
  • Nebulae: planetary

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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