Bibcode
                                    
                            Jacoby, George H.; Hillwig, Todd C.; Jones, David
    Bibliographical reference
                                    Monthly Notices of the Royal Astronomical Society
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                        8
            
                        2020
            
  Citations
                                    25
                            Refereed citations
                                    22
                            Description
                                    Eight planetary nebulae have been identified as 'born-again', a class of object typified by knotty secondary ejecta having low masses (${\sim}10^{-4}$ M☉) with nearly no hydrogen. Abell 30, the archetype of the class, also belongs to a small subset of planetary nebulae that exhibit extreme abundance discrepancy factors (where Abell 30 is the most extreme), a phenomenon strongly linked to binary star interactions. We report the presence of light curve brightness variations having a period of 1.060 d that are highly suggestive of a binary central star in Abell 30. If confirmed, this detection supports the proposed link between binary central stars and extreme abundance discrepancies.
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Physics of Ionized Nebulae
            
    The research that is being carried out by the group can be condensed into two main lines: 1) Study of the structure, dynamics, physical conditions and chemical evolution of Galactic and extragalactic ionized nebulae through detailed analysis and modelization of their spectra. Investigation of chemical composition gradients along the disk of our
            
            Jorge
            
                        García Rojas