Evolution from Supergiants to White Dwarfs

Evolution from Supergiants to White Dwarfs
The evolutionary tracks of three low-mass supergiants are shown as they eject planetary nebulae. The table gives their masses as supergiants, the
amount of mass they lose as planetary nebulae, and their remaining (white dwarf) masses. The loops indicate periods of instability and
adjustment for the white dwarfs. The dots on this graph represent the central stars of planetary nebulae whose surface temperatures and
luminosities have been determined. The crosses are white dwarfs for which similar data exist.