The utmost mass that a white dwarf star that’s stable can have is known as the Chandrasekhar limit. E.C. Stoner and Willhelm Anderson pointed it out in their papers and termed it after Subrahmanyan Chandrasekhar an Indian astrophysicist who made major independent discoveries on improving the preciseness of the computation.
The scientist community ignored the limit at the start as it would legitimize the existence of black holes (technically unrealistic at this turn-off time). Due to the pressure of electron degeneration, the white dwarf stars oppose its gravitational collapse.
Chandrasekhar limit is established at a point when the mass at which the pressure from the degeneration of electrons is not able to balance the self-attraction of the gravitational field. The limit that has been established these days is 1.39 M☉.
Pauli’s exclusion principle gives rise to a phenomenon of quantum-mechanics termed as Electron degeneracy pressure. Electrons cannot have the same state or the minimum-energy level. This is because they are fermions.
A spectrum of energy levels exists and electrons should be distributed throughout them. When the electron gas is compressed, the amount of electrons in a specific volume increases and so does the energy level of the band that has been occupied. Thus, to produce the electron degeneracy pressure, pressure must be applied for the compression of the electron gas as their energy increases when compressed. Electron capture occurs when that pressure is so great that the electron goes into the nuclei.
Chandrasekhar unit is used for explaining the maximum mass of a white dwarf star which is equivalent to 1.44 solar masses. When the limit exceeds the star into a neutron star or a black hole.
The maximum Chandrasekhar limit for a neutron star is 3 Msun.