When the red giant moves behind the white dwarf, a nova explosion on the white dwarf ignites, creating a ball of ejected nova material shown in pale orange. After the fog of material clears, a small white spot remains, indicating that the white dwarf has survived the explosion. NASA/Goddard Space Flight Center. Bonus!

https://science.nasa.gov/solar-system/skywatching/night-sky-network/night-sky-notes-july2024/