The lower edge of the main-sequence band is known as ________ and represents the location in the H-R diagram at which stars begin their lives as main-sequence stars.
A)the Coulomb barrier
B)hydrostatic equilibrium
C)the birth line
D)the zero-age main sequence
E)the evolutionary track

Question

Quizplus · Accepted Answer

The zero-age main sequence (ZAMS) is the stage in the H-R diagram where stars appear at the beginning of their main-sequence life, having just started hydrogen burning in their cores.

The Lower Edge of the Main-Sequence Band Is Known as ________