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

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

2004-06-23

arxiv.org/abs/astro-ph/0406507v1

Astron.Astrophys. 426 (2004) 145-149

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1051/0004-6361:20040387

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.

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