lecture 19 november 4 2010
Download
Skip this Video
Download Presentation
LECTURE 19, NOVEMBER 4, 2010

Loading in 2 Seconds...

play fullscreen
1 / 24

LECTURE 19, NOVEMBER 4, 2010 - PowerPoint PPT Presentation


  • 211 Views
  • Uploaded on

LECTURE 19, NOVEMBER 4, 2010. ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT j[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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'LECTURE 19, NOVEMBER 4, 2010' - gordon


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
lecture 19 november 4 2010

LECTURE 19, NOVEMBER 4, 2010

ASTR 101, SECTION 3

INSTRUCTOR, JACK BRANDT

[email protected]

ASTR 101-3, FALL 2010

slide5
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

slide6
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.

slide7
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

slide8
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.

slide11
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

slide12
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.

slide15
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

slide16
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

slide23
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

slide24
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.

ad