Dredge-up effects in galactic and magellanic planetary nebulae

Details Dredge-up effects in galactic and magellanic planetary nebulae Dredge-up effects in galactic and magellanic planetary nebulae

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..145..467c&link_type=abstract

Astronomy and Astrophysics Supplement, v.145, p.467-472

Astronomy and Astrophysics

Astrophysics

14

Galaxies: Magellanic Clouds, Abundances, Planetary Nebulae

Scientific paper

Chemical abundances are reported for 23 planetary nebulae in the Small Magellanic Cloud. Average abundances agree with values found for HII regions, suggesting that progenitors of most of these objects have been formed in the last 1-2 Gyr. The N/O vs. O/H anticorrelation is confirmed for Magellanic and galactic planetaries, and a more robust result is obtained if objects of similar ages (or masses) are grouped together. For a given class, such a negative correlation suggests that the surface enrichment due to dredge-up episodes is more efficient at lower metallicities, in agreement with recent computations. Based on observations made at European Southern Observatory (Chile) and Laboratório Nacional de Astrofísica (Brazil).

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