GS107Homework6_13AUG22(2)
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Rogue Community College *
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Course
107
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
Pages
5
Uploaded by SuperHumanOxideBison32
Name:
Derek Greene
GS 107 Homework #6
Summer 2022
(10 points each for 50 total points)
1.
Multiple Choice
A. ____
A more massive star will live (continue to have fusion) longer than
a low mass star.
a.
True
b. False
B. ___
A more massive star will have a higher temperature than a less
massive one while on the main sequence.
a.
True
b. False
C.
___ Although a red supergiant has a lower surface temperature than the
Sun, its luminosity is greater than that of the Sun.
a.
True
b. False
D. ___ The Sun will create carbon and oxygen via fusion.
a.
True
b. False
E. ___
How long will a star of the Sun’s mass undergo helium fusion?
a.
11 billion years
b.
1.3 billion years
c. 100 million years
d. 20 million years
e.
1.3 million years
1
2.
Yet still more multiple choice.
A. ____A star that starts out at a mass of 20 solar masses will end up in what
final state?
a.
White dwarf mostly made of helium
b.
White dwarf mostly made of carbon and oxygen
c.
White dwarf mostly made of oxygen, neon and magnesium
d.
Supernova that leaves a neutron star
e.
Supernova explosion that leaves a black hole
B.
____Because of the telescopes required, supernovae have only been visible
in the last hundred years.
a.
True
b. False
C.
____While gamma rays are present in the proton-proton chain, gamma rays
cannot be detected outside of a star.
a.
True
b. False
D. _____What kind of telescope did Jocelyn Bell use to discover pulsars?
a.
infrared
b. visible light
c. radio
d. ultraviolet
e. x-ray
f. neutrino
g. tachyon
E.
_____Pulsars are …
a.
Protostars that are collapsing and spinning very rapidly
b.
Rotating red giants
c.
Rotating super red giants
d.
Supernovae that are about to explode
e.
Rotating neutron stars
f.
Rotating black holes
2
3.
Describe the various ways that stars in a binary star system will die.
There are five ways stars in binary star systems can die. The most massive stars
will become a neutron star or a black hole. Smaller stars will become white dwarfs
and then eventually either a black dwarf or will be destroyed as a type Ia
supernova.
3
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4.
Consider a star whose mass is the same as that of the Sun.
Describe the life
of this star from protostar to the end of the fusion process.
A star similar to the suns mass would have started out first as a cluster or
molecules that slowly compressed due to gravity creating protostars. Next the
compression due to gravity would increase the temperature to the point at which
fusion of hydrogen starts and creates helium. The star begins to expand and turns
into a red giant at which point it will make larger elements like oxygen and carbon.
Eventually the star will explode into turn into a white dwarf.
4
5.
Consider a star whose mass is the fifty times as that of the Sun.
Describe the
life of this star from protostar to the end of the fusion process.
A star whose mass is fifty times that of the sun would start out as a group of
molecules that slowly are compressed due to gravity. As they compress fusion will
start and helium will be formed. As the fusion process continues helium is
produced and built up.
Now the star starts helium fusion which is slower than the
burning of helium in smaller stars. As the temperature increases the star can make
more massive elements like iron which leads to the core collapsing and turning into
a type II supernova. Eventually this star could explode so massive that it turns into
a black hole or it could become a neutron star.
5