PG 1159 stars
PG 1159 stars, also known as pre-degenerates, are very hot stars with strong O VI and C IV lines, that are X-ray emitters. They are probably the central stars of planetary nebulae that have dissipated.
PG 1159 stars, also known as pre-degenerates, are very hot stars with strong O VI and C IV lines, that are X-ray emitters. They are probably the central stars of planetary nebulae that have dissipated.
