Relative roles of mass loss and shell burning in envelope depletion

Determine the relative importance of wind mass loss and stable carbon-shell burning in reducing the mass of the outer layer of WD J005311 during its preceding hydrostatic giant phase.

Background

The evolutionary reconstruction suggests that approximately 0.1 solar masses may have been removed from the outer layer of WD J005311 over several hundred years before the onset of the optically thick wind phase. The paper identifies two possible mechanisms for this depletion: mass loss and stable shell burning that increases the degenerate-core mass.

The authors do not determine which mechanism dominates. This distinction is important because substantial prior mass loss could explain the formation of circumstellar material and the observed wind-termination shock, whereas shell burning would instead alter the remnant’s internal mass distribution without producing equivalent circumstellar ejecta.