Electron degeneracy, a result of the Pauli exclusion principle that prevents electrons from becoming crowded together beyond a certain limit, is important in:
A)the core of a low-mass star just before the start of core helium burning.
B)the core of a low-mass star just before the start of core hydrogen burning.
C)the core of a low-mass star during core hydrogen burning.
D)a low-mass protostar evolving toward the main sequence.

Question

Quizplus · Accepted Answer

Electron degeneracy is important in the core of a low-mass star just before the start of core helium burning, also known as the helium flash. At this point, the core has become so dense and hot that the electrons are forced into higher and higher energy levels, reaching the limit of what is allowed by the Pauli exclusion principle. This creates a pressure that halts the core collapse and initiates helium fusion, leading to a temporary increase in luminosity before the star settles into a stable state.

Electron Degeneracy, a Result of the Pauli Exclusion Principle That