TYPE-I PLANETARY-NEBULAE IN THE LARGE MAGELLANIC CLOUD - OXYGEN, SULFUR, AND ARGON ABUNDANCES AS TRACERS OF CHEMICAL ENRICHMENT

Authors
PACHECO JAD BARBUY B COSTA RDD IDIART TEP
Citation
Jad. Pacheco et al., TYPE-I PLANETARY-NEBULAE IN THE LARGE MAGELLANIC CLOUD - OXYGEN, SULFUR, AND ARGON ABUNDANCES AS TRACERS OF CHEMICAL ENRICHMENT, Astronomy and astrophysics, 271(2), 1993, pp. 429-434
Citations number
36
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
271
Issue
2
Year of publication
1993
Pages
429 - 434
Database
ISI
SICI code
0004-6361(1993)271:2<429:TPITLM>2.0.ZU;2-Q
Abstract
CCD spectra for a sample of 8 type I planetary nebulae in the LMC were obtained in the wavelength region lambdalambda 3800-8200 angstrom. El ectronic temperatures, densities and resulting abundances of He, N, O, S and Ar were obtained, where in particular the uncertainties in the He and O abundances are discussed. Using results from stellar nucleosy nthesis we estimated from the S/O and Ar/O ratios that the relative nu mber of type I supernovae in the LMC appear to be twice higher than in our Galaxy.