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LECTURE 18, NOVEMBER 2, 2010. ASTR 101, SECTION 2 INSTRUCTOR, JACK BRANDT [email protected]. Question 3. a) its core begins fusing iron. b) its supply of hydrogen is used up. c) the carbon core detonates, and it explodes as a Type I supernova. - PowerPoint PPT Presentation
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ASTR 101-3, FALL 2010 1
LECTURE 18, NOVEMBER 2, 2010
ASTR 101, SECTION 2INSTRUCTOR, JACK BRANDT
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a) its core begins fusing iron.b) its supply of hydrogen is used up.c) the carbon core detonates, and it explodes as
a Type I supernova.d) helium builds up in the core, while the
hydrogen-burning shell expands.e) the core loses all of its neutrinos, so all fusion
ceases.
Question 3
The Sun will evolve away from the main sequence when
a) its core begins fusing iron.b) its supply of hydrogen is used up.c) the carbon core detonates, and it explodes as
a Type I supernova.d) helium builds up in the core, while the
hydrogen-burning shell expands.e) the core loses all of its neutrinos, so all fusion
ceases.
Question 3
The Sun will evolve away from the main sequence when
When the Sun’s core becomes unstable and contracts, additional H fusion generates extra pressure, and the star will swell into a red
giant.
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a) red giants.b) pulsars.c) black holes.d) white dwarfs.e) red dwarfs.
Question 1
Stars like our Sun will end their lives as
a) red giants.b) pulsars.c) black holes.d) white dwarfs.e) red dwarfs.
Question 1
Stars like our Sun will end their lives as
Low-mass stars eventually swell into red giants, and their cores
later contract into white dwarfs.
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a) an asteroid.b) a planet the size of Earth.c) a planet the size of Jupiter.d) an object the size of the Moon.e) an object the size of a sugar cube.
Question 8
In a white dwarf, the mass of the Sun is packed into the volume of
a) an asteroid.b) a planet the size of Earth.c) a planet the size of Jupiter.d) an object the size of the Moon.e) an object the size of a sugar cube.
Question 8
In a white dwarf, the mass of the Sun is packed into the volume of
The density of a white dwarf is about a million times greater
than normal solid matter.
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a) mass transfer onto a white dwarf in a binary star system.
b) repeated helium fusion flashes in red giants.c) rapid collapse of a protostar into a massive O star.d) the explosion of a low-mass star.e) the birth of a massive star in a new cluster.
Question 11
A nova involves
a) mass transfer onto a white dwarf in a binary star system.
b) repeated helium fusion flashes in red giants.c) rapid collapse of a protostar into a massive O star.d) the explosion of a low-mass star.e) the birth of a massive star in a new cluster.
Question 11
A nova involves
Sudden, rapid fusion of new fuel dumped onto a white dwarf
causes the star to flare up, and for a short time become much
brighter.
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a) the number of main sequence stars.b) the ratio of giants to supergiants.c) the luminosity of stars at the turnoff point.d) the number of white dwarfs.e) supernova explosions.
Question 6
Astronomers determine the age of star clusters by observing
a) the number of main sequence stars.b) the ratio of giants to supergiants.c) the luminosity of stars at the turnoff point.d) the number of white dwarfs.e) supernova explosions.
Question 6
Astronomers determine the age of star clusters by observing
The H–R diagram of a cluster can indicate its approximate age.
Turnoff point from the main sequence
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a) as a protostar.b) as a red giant.c) as a main-sequence star.d) as a white dwarf.e) evolving from type O to type M.
Question 10
A star will spend most of its “shining” lifetime
a) as a protostar.b) as a red giant.c) as a main-sequence star.d) as a white dwarf.e) evolving from type O to type M.
Question 10
A star will spend most of its “shining” lifetime
In the main-sequence stage, hydrogen fuses to helium.
Pressure from light and heat pushing out balances
gravitational pressure pushing inward.
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