ABUNDANCES OF PLANETARY NEBULAE IN THE OUTER DISK OF M31
- Department of Astronomy, Williams College, Williamstown, MA 01267 (United States)
- Department of Astronomy, University of Washington, Seattle, WA 98195 (United States)
- H.L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States)
We present spectroscopic observations and chemical abundances of 16 planetary nebulae (PNe) in the outer disk of M31. The [O III] {lambda}4363 line is detected in all objects, allowing a direct measurement of the nebular temperature essential for accurate abundance determinations. Our results show that the abundances in these M31 PNe display the same correlations and general behaviors as Type II PNe in the Milky Way. We also calculate photoionization models to derive estimates of central star properties. From these we infer that our sample PNe, all near the bright-end cutoff of the planetary nebula luminosity function, originated from stars near 2 M{sub Sun }. Finally, under the assumption that these PNe are located in M31's disk, we plot the oxygen abundance gradient, which appears shallower than the gradient in the Milky Way.
- OSTI ID:
- 22036961
- Journal Information:
- Astrophysical Journal, Vol. 753, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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