Chapter 10- The Death of StarsQuestion 1
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As a main sequence star exhausts hydrogen in its core, its surface becomes ___ and its energy output per second (luminosity) becomes ____.
A mass is transferred in a normal star in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n)
In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.
When material expanding away from a star in a binary system reaches the Roche surface
the material is no longer gravitationally bound to the star.
In the orbital plane of a binary star system, matter can be transferred from one star to the other at the ________ located directly between the two stars is the point where the Roche lobes meet.
In degenerate matter
pressure does not depend on temperature.
A white dwarf is composed of
hydrogen nuclei and degenerate electrons.
Star clusters are important to our study of stars because
they give us a method to test the our theories and models of stellar evolution.
After what evolutionary stage does a star become a white dwarf?
What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
White dwarfs don't generate their own energy.
The triple alpha process
occurs during helium flash.
Giant and supergiant stars are rare because
the giant or supergiant stage is very short.
A(n) ____ is a collection of 100 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.
A(n) ____ is a collection of 105 to 106 stars in a region 10 to 30 pc in diameter. The stars in the collection tend to be more than 109 years old and mostly yellow and red stars.
The Crab nebula is
A planetary nebula
What is the approximate age of the star cluster in the H-R diagram below? Hint: Main sequence stars of spectral types between A and B core’s supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years. Type G about 10 billion years. Between K and M about 30 billion years.
10 billion years
A Type I supernova is believed to occur when
a white dwarf exceeds the Chandrasekhar limit.
If the theory that novae occur in close binary systems is correct, then novae should
repeat after some interval.
The Algol paradox is explained by considering
mass transfer between the two stars in a binary system.