Astronomy Chapter 15 Summary
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9 Terms
When a star dies, it can become a?
White dwarf, neutron star, or black hole.
When does a white dwarf form?
A low mass star expels its outer layers to form a planetary nebula shell and leaves its hot core exposed.
What is the approximate radius of a white dwarf?
About the same as the Earth’s.
What must the mass of a white dwarf be less than?
The Chandrasekhar limit, or it will collapse.
What may happen if a white dwarf is in a binary system?
It may accrete mass from its neighbor and explode either as a nova or as a type Ia supernova.
How does a neutron star form?
When a massive star’s iron core collapses and triggers a supernova explosion.
What happens to the core during the formation of a neutron star?
The core’s protons and electrons are compressed to make neutrons.
What do a neutron star's spinning and magnetic field generate?
Beams of radiation that sweep across space, making the spinning neutron star a pulsar.
What is formed when a massive star’s iron core contains more than about 3 M?
A black hole.
