They contract and dim along the Hayashi track, decreasing in luminosity but staying at roughly the same temperature, until reaching the main sequence directly or by passing through the Henyey track.
Stellar classification | Stellar Kart | Summer's Stellar Gaze | Stellar collision | Stellar wind (code name) | Stellar Wind | stellar wind | Stellar's Sea Eagle | Stellar Classification | stellar classification | Stellar atmosphere | Isochrone map | Hypercompact stellar system |