Fr.: trajet de Henyey
A nearly horizontal path on the → Hertzsprung-Russell diagram that a → pre-main sequence star of small mass follows in an early stage of evolution after leaving the → Hayashi track and before reaching the → main sequence. During this stage the pre-main sequence star remains almost wholly in radiative equilibrium.
After Louis George Henyey (1910-1970), American astronomer. Henyey et al. (1955, PASP 67, 154).