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A detailed look at chemical abundances in the Magellanic Clouds

Published online by Cambridge University Press:  30 August 2012

Richard A. Shaw ,
Ting-Hui Lee ,
Letizia Stanghellini ,
James E. Davies ,
D. Anibal García-Hernández ,
Pedro García-Lario ,
Jose-Vicente Perea-Calderón ,
Eva Villaver ,
Arturo Manchado  and
Stacy Palen
...Show all authors
Richard A. Shaw
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ 85719, USA
Ting-Hui Lee
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ 85719, USA Dept. of Physics & Astronomy, Western Kentucky Univ., Bowling Green, KY 42101, USA
Letizia Stanghellini
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ 85719, USA
James E. Davies
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ 85719, USA
D. Anibal García-Hernández
Affiliation:
Instituto de Astrofísica de Canarias, vía Láctea s/n, La Laguna, E-38200 Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38201 Tenerife, Spain
Pedro García-Lario
Affiliation:
Herschel Science Centre, European Space Astronomy Centre, E-28080 Madrid, Spain
Jose-Vicente Perea-Calderón
Affiliation:
European Space Astronomy Centre, INSA S. A., E28080, Madrid, Spain
Eva Villaver
Affiliation:
Departamento de Física Teórica C-XI, Univ. Autónoma de Madrid, E-28049 Madrid, Spain
Arturo Manchado
Affiliation:
Instituto de Astrofísica de Canarias, vía Láctea s/n, La Laguna, E-38200 Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38201 Tenerife, Spain Consejo Superior de Investigaciones Cientficas, E-28006 Madrid, Spain
Stacy Palen
Affiliation:
Physics Dept., Weber State University, Ogden, UT 84408, USA
Bruce Balick
Affiliation:
Astronomy Dept., Univ. of Washington, Seattle, WA 98195, USA
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Abstract

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We determine elemental abundances of He, N, O, Ne, S, and Ar in Magellanic Cloud planetary nebulae (PNe) using direct methods and a large set of observed ions, minimizing the need for ionization correction factors. In contrast to prior studies, we find a clear separation between Type I and non-Type I PNe in these low-metallicity environments, and no evidence that the O-N nucleosynthesis cycle is active in low-mass progenitors. We find that the S/O abundance ratio is anomalously low compared to H ii regions, confirming the “sulfur anomaly” found for Galactic PNe. We also found that Ne/O is elevated in some cases, raising the possibility that Ne yields in low-mass AGB stars may be enhanced at low metallicity.

Keywords

planetary nebulae: generalISM: abundancesgalaxies: individual (LMC, SMC)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 502 - 503
Copyright
Copyright © International Astronomical Union 2012

References

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