Neutron Star
and
Pulsar Stage

Mattia Sibilia VDa.s. 2013/14

Introduction

Star

White Dwarf

Black Dwarf

Red Supergiant

Planetary Nebula

SNR (SuperNovae Remnant)

Neutron Star / Pulsar

Black Hole

Supernova

The Birth

Red Supergiant

Supernova explosion

Outward (external strata)

Inward ( central core )

Compression in a sphere ( 10 miles )

Neutron Star

The structure

Compression

Change of structure

electrons and protons

neutrons

Central core

Dense, super-hot mass

The properties - Density

Neutron Star

dense object

No empty space in his structure

Teaspoon of neutron star's matter

100 million tons

On Earth it would disappear instantly

The properties - Surface

Enormous Gravity force

No hills or bumps

Perfect glass ball

Attraction of debris

Pressed on surface

Part of solid crust

The properties - spin

During supernova explosion

Mass spin very fast

Principle of Conservation of Angular Momentum

Normally 30 times/sec

The fastest one 600 times/sec

The properties - Temperature

Temperature

500 million degrees

X-rays

White

The Magnetic Fields

Supernova explosion

Magnetic forces

debris around the star

Impact the surface of neutron star (due to the gravity force)

jets

Pulsar

Matter impacted

turn back away from star

Into two narrow beams of matter

jets

Point at Earth

Pulsing Neutron Star or Pulsar

The Death

Slowly the rest of supernova gases (fuel of neutron star)

Will run out:

No Jets

colour: from white to red

The spin decelerate

Black frigid sphere with a powerful gravity

Black Dwarf

bibliography

Celestia's educational activity nr. 6 (Star)

Geografia Generale (Crippa-Fiorani)

http://en.wikipedia.org/wiki/Neutron_star

http://www.nasa.gov/ ( for images )