1 / 24

LECTURE 19, NOVEMBER 4, 2010

LECTURE 19, NOVEMBER 4, 2010. ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu. 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.

gordon
Télécharger la présentation

LECTURE 19, NOVEMBER 4, 2010

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LECTURE 19, NOVEMBER 4, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu ASTR 101-3, FALL 2010

  2. ASTR 101-3, FALL 2010

  3. ASTR 101-3, FALL 2010

  4. ASTR 101-3, FALL 2010

  5. 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

  6. 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.

  7. 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

  8. 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.

  9. ASTR 101-3, FALL 2010

  10. ASTR 101-3, FALL 2010

  11. 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

  12. 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.

  13. ASTR 101-3, FALL 2010

  14. ASTR 101-3, FALL 2010

  15. 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

  16. 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

  17. ASTR 101-3, FALL 2010

  18. ASTR 101-3, FALL 2010

  19. ASTR 101-3, FALL 2010

  20. ASTR 101-2, SPRING 2006

  21. ASTR 101-3, FALL 2010

  22. ASTR 101-3, FALL 2010

  23. 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

  24. 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.

More Related