Abstract
view Abstract Citations (45) References (64) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Faint Planetary Nebulae in the Magellanic Clouds: Central Star Properties and Nebular Abundances for the Jacoby Sample Henry, Richard B. C. ; Liebert, James ; Boroson, T. A. Abstract We have studied 44 of the LMC and SMC planetary nebulae contained in the sample compiled by Jacoby. For each of these objects we employed spectrophotometric observations published by Boroson and Liebert to infer Stoy temperatures, luminosities, and radii of the central stars. For those objects in which [O III] electron temperatures could be determined (18 in the LMC, 11 in the SMC) nebular abundances of He, N, O, and Ne were calculated and compared with values for giant H II regions for the relevant host galaxy. While the levels of He, O, and Ne were comparable to the H II region abundances, the N abundance usually exceeded the interstellar level by roughly an order of magnitude. When we combined our abundance results with previously published results for planetary nebulae in the LMC, SMC, and the Galaxy, we found a strong correlation for O/H versus Ne/H and strong anticorrelations for O/H versus [O III] temperature, and N/O versus O/H. We conclude that most planetary nebulae show CNO products principally from the CN cycle, but that the N production of these stars is a decreasing function of progenitor metallicity or mass. A comparison of current planetary nebula progenitor yields of nitrogen with both theoretical predictions for intermediate-mass stars as well as the yield required to explain the interstellar level of that element in the LMC and SMC indicates that intermediate-mass stars contribute significantly to the interstellar N enrichment in the LMC, while their contribution in the SMC is somewhat less. Finally, we find that the average mass of nitrogen ejected during the planetary nebula phase is 3.1 x 10^-4^ M_sun_ and 6.1 x 10^-5^ M_sun_ in the LMC and SMC, respectively. Publication: The Astrophysical Journal Pub Date: April 1989 DOI: 10.1086/167342 Bibcode: 1989ApJ...339..872H Keywords: Abundance; Faint Objects; Magellanic Clouds; Planetary Nebulae; Stellar Spectrophotometry; H Ii Regions; Metallicity; Stellar Luminosity; Stellar Temperature; Astrophysics; GALAXIES: MAGELLANIC CLOUDS; NEBULAE: ABUNDANCES; NEBULAE: PLANETARY full text sources ADS | data products SIMBAD (44) NED (2)
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