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Chemical Abundances of Planetary Nebulae in the Substructures of M31 by Fang, Xuan; Garcia-Benito, Ruben; Guerrero, Martin A.; Liu, Xiaowei; Yuan, Haibo; Zhang, Yong; Zhang, Bing is a scholarly article available to read on EtoBox.

What is Chemical Abundances of Planetary Nebulae in the Substructures of M31 about?

We present deep spectroscopy of planetary nebulae (PNe) that are associated with the substructures of the Andromeda Galaxy (M31). The spectra were obtained with the OSIRIS spectrograph on the 10.4 m GTC. Seven targets were selected for the observations, three in the Northern Spur and four associated with the Giant Stream. The most distant target in our sample, with a rectified galactocentric distance >100 kpc, was the first PN discovered in the outer streams of M31. The [O III] 4363 auroral line was well detected in the spectra of all targets, enabling electron temperature determination. Ionic abundances are derived based on the [O III] temperatures, and elemental abundances of helium, nitrogen, oxygen, neon, sulfur, and argon are estimated. The relatively low N/O and He/H ratios as well as abundance ratios of alpha-elements indicate that our target PNe might belong to populations as old as ~2 Gyr. Our PN sample, including the current seven and the previous three observed by Fang et al., have rather homogeneous oxygen abundances. The study of abundances and the spatial and kinematical properties of our sample leads to the tempting conclusion that their progenitors might belong to t

Author

Fang, Xuan; Garcia-Benito, Ruben; Guerrero, Martin A.; Liu, Xiaowei; Yuan, Haibo; Zhang, Yong; Zhang, Bing

Published

2015

Language

EN