white dwarf cooling track
râh-e sardeš-e sefid kutulé
Fr.: trajet de refroidissement de naine blanche
In the → Hertzsprung-Russell diagram, the evolutionary track followed by a → low-mass or an → intermediate-mass star when it can no longer produce thermonuclear energy. The track starts at the end of the → horizontal branch to lead the star to a → white dwarf phase.