1 / 15

Supernovae and Neutron Stars

Supernovae and Neutron Stars. Specific textbook sections. Evolution after the main sequence: Section 19.4 White dwarf stars: Section 20.1 Supernovae and neutron stars: Section 20.2. Core collapse of a massive star has two consequences. Massive explosion (10 44 Joules)

tudor
Download Presentation

Supernovae and Neutron Stars

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. Supernovae and Neutron Stars

  2. Specific textbook sections • Evolution after the main sequence: Section 19.4 • White dwarf stars: Section 20.1 • Supernovae and neutron stars: Section 20.2

  3. Core collapse of a massive star has two consequences • Massive explosion (1044 Joules) • Production of a neutron star

  4. Formation of a neutron star from stellar core • As core collapses, matter becomes compressed • Electrons and protons forced together e+p > n + nu (neutronization) • Core of the becomes a neutron fluid • Neutronization produces a burst of neutrinos • Neutron fluid in core becomes degenerate and rigid

  5. The physics of a self-gravitating neutron blob (neutron star) • Radius versus mass relation for neutron star • Notice size of neutron star • Masses extend above Chandrasekhar limit

  6. Theoretical prediction of the existence of a neutron star • The remnant after the explosion of a massive star • An object having the mass of the Sun (or more) but in an object with the diameter of Iowa City! • An equivalent to the Chandrasekhar mass (largest possible mass of a neutron star) • Do they exist?

  7. The problem of the Crab Nebula…the remnant of the supernova of 1054 AD Even today,something is powering the Crab Nebula, causing it to shine at x-rays

  8. 1968: The Discovery of Pulsars: Rotating Neutron Stars http://www.jb.man.ac.uk/~pulsar/Education/Sounds/sounds.html

  9. Pulsar properties • Highly regular pulse properties • PSR0329+54, P=0.714519699726 sec • PSR1633+24, P=0.4905065128003 sec • What in nature could provide such a perfect clock? • Demo

  10. Pulsars as rotating neutron stars demo

  11. The Crab Nebula Pulsar http://chandra.harvard.edu/photo/2002/0052/movies.html

  12. How many pulsars (neutron stars) are there in the sky? http://www.atnf.csiro.au/research/pulsar/psrcat

  13. Neutron stars: from exotica to numerous astronomical objects

  14. A final mystery…pulsar masses are nearly all AT the Chandrasekhar Limit

  15. Periods and Period Derivatives for Pulsars

More Related