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Sunday, March 3, 2013

Study Guide Ch10

Chapter 10- The Death of Stars

Study Guide
Answer is slashed threw its not the right one if in red it might be the answer.
Question 1
As a main sequence star exhausts hydrogen in its core, its surface becomes ___ and its energy output per second (luminosity) becomes ____.
cooler; larger

Question 2
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)
accretion disk.

Question 3
In star clusters, the ____ stars are giant stars fusing helium in their cores and then in their shells.
turnoff point
main sequence
turnon point
hydrogen flash
horizontal branch

Question 4
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.

Question 5
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.
Lagrangian points

Question 6
In degenerate matter
pressure does not depend on temperature.

Question 7
A white dwarf is composed of
hydrogen nuclei and degenerate electrons.

Question 8
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.

Question 9
After what evolutionary stage does a star become a white dwarf?
Giant

Question 10
What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
White dwarfs don't generate their own energy.

Question 11
The triple alpha process
occurs during helium flash.

Question 12
Giant and supergiant stars are rare because
the giant or supergiant stage is very short.

Question 13
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.
open cluster

Question 14
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.
globular cluster

Question 15
The Crab nebula is
supernova remnant.

Question 16
A planetary nebula
produces an absorption spectrum.

Question 17
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

Question 18
 A Type I supernova is believed to occur when
a white dwarf exceeds the Chandrasekhar limit.

Question 19
If the theory that novae occur in close binary systems is correct, then novae should
repeat after some interval.

Question 20
The Algol paradox is explained by considering
mass transfer between the two stars in a binary system.

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