Kelvin–Helmholtz contraction(helm -holts) See Kelvin–Helmholtz timescale.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Kelvin-Helmholtz contraction[′kel·vən ′helm‚hōlts kən‚trak·shən]
A contraction of a star once it is formed and before it is hot enough to ignite its hydrogen; the contraction converts gravitational potential energy into heat, some of which is radiated, with the remainder used to raise the internal temperature of the star.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.