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The PNe and H II regions in NGC 6822 revisited. Clues to AGB nucleosynthesis
Jorge García-Rojas, Miriam Peña, Sheila Flores-Durán +1
(Abridged) The chemical behaviour of an ample sample of PNe in NGC6822 is analyzed. Spectrophotometric data of 11 PNe and two H II regions were obtained with the OSIRIS spectrograp…
NGC 6778: Strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae
David Jones, Roger Wesson, Jorge García-Rojas +2
We present new optical spectra of the nearby, bright, planetary nebula NGC 6778. The nebula has been known to emit strong recombination lines for more than 40 years but this is the…
S-process enrichment in the planetary nebula NGC 3918. Results from deep echelle spectrophotometry
J. García-Rojas, S. Madonna, V. Luridiana +4
(Abridged) The chemical content of the planetary nebula NGC 3918 is investigated through deep, high-resolution UVES at VLT spectrophotometric data. We identify and measure more tha…