Very Late Thermal Pulses Influenced by Accretion in Planetary Nebulae

Details Very Late Thermal Pulses Influenced by Accretion in Planetary Nebulae Very Late Thermal Pulses Influenced by Accretion in Planetary Nebulae

2009-03-19

arxiv.org/abs/0903.3364v1

NewAstron.14:654-658,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Submitted to New Astronomy

Scientific paper

10.1016/j.newast.2009.03.006

We consider the possibility that a mass of ~10^{-5}-10^{-3} Msun flows back from the dense shell of planetary nebulae and is accreted by the central star during the planetary nebula phase. This backflowing mass is expected to have a significant specific angular momentum even in (rare) spherical planetary nebulae, such that a transient accretion disk might be formed. This mass might influence the occurrence and properties of a very late thermal pulse (VLTP), and might even trigger it. For example, the rapidly rotating outer layer, and the disk if still exist, might lead to axisymmetrical mass ejection by the VLTP. Unstable burning of accreted hydrogen might result in a mild flash of the hydrogen shell, also accompanied by axisymmetrical ejection.

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