1. Will the PowerPoint presentations ever end? No.
Neutron Stars
Will the PowerPoint presentations ever end?
No.

2. Post-Supernova Explosion
Does the entire star destroy itself during SN?
NO. Everything past the core is expelled outward at high velocities.
Core remains behind. IF mass is between 1 and 3 Msun (solar masses)--> Neutron Star!!

3. Characterisitics
Extremely dense and small. Average diameter is 20 km (size of Detroit)

4. Characteristics Cont’d

5. Characteristics Cont’d again
Mainly neutrons exist. Interior is questionable.
Neutron-degenerate pressure- pressure exerted by neutrons on neutrons entering their space.
Keeps the neutron stars size “constant”.. Sort of
Rapid rotation (angular momentum). Rotates less than a second.
Extremely powerful magnetic fields (amplified by collapse of core)

6. What happens to the neutron star?
Eventually it will release most of its radiation and the energy will fade away (a few million years)
It will exist as a large ball of neutrons.

7. What is a Pulsar? A source of short precisely time radio bursts.
Caused by the rotation of a neutron star.

8. Pulsar

9. Crab Pulsar in the Crab NebulaOn
Off

10. Crab Nebula today!

11. X-ray image of Supernova Remnant

12. VERY BIG Neutron Star
We thought this star had too much mass (greater than 3 solar masses) to be a neutron star.
A good example of the process of science (and how science evolves).