# Thermonuclear oubursts of AM CVn stars

## TL;DR

This paper studies the evolution of AM CVn stars with white dwarf donors, showing they do not undergo helium detonation and end as massive white dwarfs, with new insights into nucleosynthesis during outbursts.

## Contribution

It demonstrates that helium detonation does not occur in AM CVn stars and introduces the novel finding of neutron-rich isotope synthesis during outbursts.

## Key findings

- Accretion in AM CVn stars does not lead to helium detonation.
- AM CVn stars evolve into massive white dwarfs.
- Neutron-rich isotopes are synthesized during outbursts.

## Abstract

We consider initial stage of the evolution of AM CVn type stars with white dwarf donors, which is accompanied by thermonuclear explosions in the layer of accreted He. It is shown that the accretion never results in detonation of He and accretors in AM CVn stars finish their evolution as massive WDs. We found, for the first time, that in the outbursts the synthesis of n-rich isotopes, initiated by the ${\mathrm{^{22}{Ne}(\alpha,n)^{25}Mg}}$ reaction becomes possible.