Astrophysics (Index)About

PG 1159 star

(pre-degenerate, pre-white dwarf)
(star in transition between planetary nebula and white dwarf)

A PG 1159 star (aka pre-degenerate) is white dwarf coming into being (or a pre-white dwarf), having completed a planetary nebula phase. The term is coined from the first identified, PG 1159-035, which appears to have resumed helium burning but is expected to cool into a white dwarf. They are hot, in the 75,000-200,000 K and show an excess of ultraviolet. Some characteristics of PG 1159-035:

This is exceptional for being both far smaller and far more luminous than the Sun.

(star type,degeneracy)
Further reading:

Referenced by page:
chemically peculiar star (CP star)