Stellar Evolution Crossword

A region of the Hertzsprung-Russell diagram populated by evolved cool luminous stars
Formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula
A contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun
A continuous and distinctive band of stars that appears on plots of stellar color versus brightness
A very large star that is even brighter than a giant, often despite being relatively cool
A celestial object of very small radius and very high density, composed predominantly of closely packed neutrons
A celestial object intermediate in size between a giant planet and a small star, believed to emit mainly infrared radiation
A region of space having a gravitational field so intense that no matter or radiation can escape
A star that suddenly increases gently in brightness because of a catastrophic explosion that ejects most of its mass
A transient phase between the AGB and planetary nebula phases of stellar evolution
The smallest, coolest, and dimmest main sequence stars and orange, red, or brown in color
The region of the Hertzsprung-Russell diagram occupied by evolved stars of low mass and low metallicity during their central Helium burning phase
A star that is brighter than a normal main sequence star of the same spectral class, but not as bright as giant stars
The portion of the giant branch before helium ignition occurs in the course of stellar evolution