The chemical composition of the post-asymptotic giant branch F supergiant CRL 2688
We present an analysis of a high-resolution (R ˜ 50 000) optical spectrum of the central region of the protoplanetary nebula CRL 2688. This object is thought to have recently moved off the asymptotic giant branch (AGB) and displays abundance patterns of CNO and heavy elements that can provide us with important clues to help us understand the
Ishigaki, Miho N. et al.
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2012