Night Before Flashcards
High mass stars generate sufficient temperatures to burn their residual carbon ash during later stages of their evolution
As a result they don’t end their lives as burned out carbon black dwarfs
Stars leave the main sequence only when they run out of hydrogen in their cores
True
White dwarves do not produce new energy; they just radiate away excess energy as they cool
True there is no longer a source of fusion energy they slowly cool until they become a black dwarf
As a star evolves away from the main sequence it’s surface becomes cooler
And it becomes more luminous
The central star of a planetary nebula is the exposed core of a red giant
True the release of mass that creates a planetary nebula exposes the core of the star
A stars mass is determined by the hydrostatic equilibrium
True
Recurrente no se originate where?
In binary systems
Supernovae have been seen from how far away? Can they ever be seen by the naked eye?
Thousands of parsecs and yes they can!
Ordinary novae are binary systems involving a:
White dwarf
What kind of mass does a star have to have to become a supernova ?
A mass 8 Times that of the sun
Most heavier elements are created when?
During supernova explosions
A star can become a nova more than once but a supernova only once
A supernova destroys the star involved
Supernovae leave behind nebulae that provide the raw materials to make new stars. Our sun and earth are formed from such material.
True. Stellar material is recycled into new stars. These new stars contain more heavy elements than the stars that dust not use recycled material.
