On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting

TL;DR

This paper explores how hydrogen mass and convective overshooting influence white dwarf spectral evolution, proposing a proportional overshooting length to improve observational fits.

Contribution

It introduces a model linking convective overshooting length to the convection zone thickness, enhancing the understanding of white dwarf spectral evolution.

Findings

Convective overshooting significantly affects spectral evolution.

Overshooting length should be proportional to convection zone thickness.

Model improves fit to observational data.

Abstract

We investigate the spectral evolution of white dwarfs by considering the effects of hydrogen mass in the atmosphere and convective overshooting above the convection zone. We notice the importance of the convective overshooting and suggest that the overshooting length should be proportional to the thickness of the convection zone to better fit the observations.