The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr

Details The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr

2007-06-05

arxiv.org/abs/0706.0714v2

Monthly Notices of the Royal Astronomical Society, Volume 380, Issue 2, pp. 763-770, 2007

Astronomy and Astrophysics

Astrophysics

Submitted to MNRAS. In includes an appendix regarding the treatment of reduced convective motions within the Mixing Length The

Scientific paper

10.1111/j.1365-2966.2007.12115.x

We present 1-D numerical simulations of the very late thermal pulse (VLTP) scenario for a wide range of remnant masses. We show that by taking into account the different possible remnant masses, the observed evolution of V4334 Sgr (a.k.a. Sakurai's Object) can be reproduced within the standard 1D-MLT stellar evolutionary models without the inclusion of any $ad-hoc$ reduced mixing efficiency. Our simulations hint at a consistent picture with present observations of V4334 Sgr. From energetics, and within the standard MLT approach, we show that low mass remnants \hbox{($M\lesssim0.6$\msun)} are expected to behave markedly different than higher mass remnants \hbox{($M\gtrsim0.6$\msun)} in the sense that the latter are not expected to expand significantly as a result of the violent H-burning that takes place during the VLTP. We also assess the discrepancy in the born again times obtained by different authors by comparing the energy that can be liberated by H-burning during the VLTP event.

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