The progenitor of the 'born-again' core V605 Aql and the relation to its younger twin V4334 Sgr

Abstract

We derived the properties of V605 Aql before the final helium flash pulse by studying its surrounding PN A58. Photoionizing models of our spectral data together with a new distance estimate and a closer look at the recombination timescales lead to a consistent model. Comparing our findings with the only hydrogen-poor twin, namely Sakurai's Object, we conclude that these born-again objects have normal PNe core masses. We are able to prove V605 Aql indeed to be, similar to V4332 Sgr, a very late thermal pulse object and to put constraints for the evolutionary time scales for the transition back to the AGB.

LaTeX, 5 pages, 3 figures, Accepted in Astron. & Astrophys

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• The rise and fall of V4334 Sgr (Sakurai's Object)
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Cited by in corpus (17)

• The Element Abundances in Bare Planetary Nebula Central Stars and the Shell Burning in AGB Stars
• New evolutionary calculations for the Born Again scenario
• V605 Aql: The Older Twin of Sakurai's Object
• The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr
• The onset of photoionization in Sakurai's Object (V4334 Sgr)
• The enigma of the oldest `nova': the central star and nebula of CK Vul
• Evolution of the 1919 Ejecta of V605 Aquilae
• V605 Aquilae: a born again star, a nova or both?
• Evolution of the central stars of young planetary nebulae
• Revealing the mid-infrared emission structure of IRAS 16594-4656 and IRAS 07027-7934
• Astrophysics in 2005
• First images of the molecular gas around a born-again star revealed by ALMA
• Photoionization models of roundish galactic planetary nebulae in the thick disk
• How peculiar is the "peculiar variable" DZ Crucis (Nova Cru 2003)?
• A primer on the formation and evolution of hydrogen deficient Central Stars of Planetary Nebulæ and Related Objects
• Recombination of hot ionized nebulae: The old planetary nebula around V4334 Sgr (Sakurai's star)
• Pre-explosion helium shell flash in type Ia supernovae