Lecture 19 november 4 2010
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LECTURE 19, NOVEMBER 4, 2010. ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT [email protected] Question 13. a) its mass exceeds the Chandrasekhar limit. b) its electron degeneracy increases enormously. c) fusion reactions increase in it’s core. d) iron in its core collapses.

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LECTURE 19, NOVEMBER 4, 2010

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Lecture 19 november 4 2010

LECTURE 19, NOVEMBER 4, 2010

ASTR 101, SECTION 3

INSTRUCTOR, JACK BRANDT

[email protected]

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

Question 13

  • a) its mass exceeds the Chandrasekhar limit.

  • b) its electron degeneracy increases enormously.

  • c) fusion reactions increase in it’s core.

  • d) iron in its core collapses.

  • e) the planetary nebula stage ends.

A white dwarf can explode when


Lecture 19 november 4 2010

Question 13

  • a) its mass exceeds the Chandrasekhar limit.

  • b) its electron degeneracy increases enormously.

  • c) fusion reactions increase in it’s core.

  • d) iron in its core collapses.

  • e) the planetary nebula stage ends.

A white dwarf can explode when

If additional mass from a companion star pushes a white dwarf beyond 1.4 solar masses, it can explode in a Type I supernova.


Lecture 19 november 4 2010

Question 14

  • a) hydrogen fusion shuts off.

  • b) uranium decays into lead.

  • c) iron in the core starts to fuse.

  • d) helium is exhausted in the outer layers.

  • e) a white dwarf gains mass.

A Type II supernova occurs when


Lecture 19 november 4 2010

Question 14

  • a) hydrogen fusion shuts off.

  • b) uranium decays into lead.

  • c) iron in the core starts to fuse.

  • d) helium is exhausted in the outer layers.

  • e) a white dwarf gains mass.

A Type II supernova occurs when

Fusion of iron does not produce energy or provide pressure; the star’s core collapses immediately, triggering a supernova explosion.


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

Question 2

a) in the Big Bang.

b) by nucleosynthesis in massive stars.

c) in the cores of stars like the Sun.

d) within planetary nebulae.

e) They have always existed.

Elements heavier than hydrogen and Helium were created


Lecture 19 november 4 2010

Question 2

a) in the Big Bang.

b) by nucleosynthesis in massive stars.

c) in the cores of stars like the Sun.

d) within planetary nebula

e) They have always existed.

Elements heavier than hydrogen and helium were created

Massive stars create enormous core temperatures as red supergiants, fusing helium into carbon, oxygen, and even heavier elements.


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

Question 3

a) pulsars can be used as interstellar navigation beacons.

b) the period of pulsation increases as a neutron star collapses.

c) pulsars have their rotation axis pointing toward Earth.

d) a rotating neutron star generates an observable beam of light.

The lighthouse model explains how


Lecture 19 november 4 2010

Question 3

a) pulsars can be used as interstellar navigation beacons.

b) the period of pulsation increases as a neutron star collapses.

c) pulsars have their rotation axis pointing toward Earth.

d) a rotating neutron star generates an observable beam of light.

The lighthouse model explains how


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-2, SPRING 2006


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

ASTR 101-3, FALL 2010


Lecture 19 november 4 2010

Question 4

a) matter spiraling into a large black hole.

b) the collision of neutron stars in a binary system.

c) variations in the magnetic fields of a pulsar.

d) repeated nova explosions.

e) All of the above are possible.

One possible explanation for a gamma-ray burster is


Lecture 19 november 4 2010

Question 4

a) matter spiraling into a large black hole.

b) the collision of neutron stars in a binary system.

c) variations in the magnetic fields of a pulsar.

d) repeated nova explosions.

e) All of the above are possible.

One possible explanation for a gamma-ray burster is

Gamma-ray bursts vary in length, and the coalescence of two neutron stars seems to account for short bursts.


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