# Should BD in this sector means Brown dwarfs or Black dwarfs?

The one in the sector as BD/NS/BH. And please explain why Brown/Black dwarf should be here among neutron stars and black holes. Thank you for your help.

Source: Beech, M. (2019). Introducing the stars. Cham: Springer Nature Switzerland AG.

• Can you credit the original source for the diagram? Thanks!
– uhoh
Nov 9 '20 at 11:52