CH 21 HW
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20 Terms
What condition must a white dwarf meet to drastically increase in brightness?
It has another star nearby.
Which stars will become hot enough to form elements heavier than oxygen?
A star that is twice as massive as the Sun; A star that is eight times more massive than the Sun.
What triggers a massive star to become a supernova?
When it forms iron in its core.
What balances the radius of a white dwarf?
The inward force of gravity and the outward push of electron degeneracy pressure.
What occurs during a nova?
Hydrogen fusion ignites on the surfaces of a white dwarf in a binary system.
What type of supernova occurs when fusion creates iron in the core?
A massive star supernova.
What is the white dwarf limit for a binary system to explode as a supernova?
1.4 solar masses.
What does an accretion disk consist of?
Hot, swirling gas captured by a white dwarf, neutron star, or black hole from a binary companion star.
How does a nova differ from a supernova?
A nova is much less luminous.
What does Figure 21.8 suggest about a supernova with steadily declining luminosity?
It is most likely associated with a star that is more than eight times the mass of the Sun.
How often should an observable supernova occur in our Galaxy?
About once every century.
What is not evidence for supernovae in our Galaxy?
The existence of binary stars in our Galaxy.
Using the light curve, after how long will a supernova become too faint to be seen?
About 70 days.
Where did the silver atoms found in jewelry originate?
In a supernova.
What will nuclear fusion in the Sun create?
Elements up to and including oxygen.
Where did most of the carbon in our bodies originate?
The core of a red-giant star.
Which type of stars produce elements like oxygen, magnesium, and silicon?
Massive stars only.
Why will a massive star collapse when iron is produced in the core?
Iron will not fuse, so the core doesn't produce energy to oppose the inward gravitational pull of the star.
What enriched the solar nebula with elements heavier than iron?
A Type II supernova.
Which elements found in nature were not formed inside stars?
Hydrogen and helium.