Dying Stars Part 1 Neutron Stars

Supernovas make some pretty remanants also. The Crab Nebula was seen in 1054 CE It has a Neutron Star in the center – in addition to blinking on and off – it also gives a radio sound. (Pulsar)

Pulsars –When a large mass star ends its life in an explosion – a supernova – the core of the star goes on to form one of two things – a Black Hole (if the stars mass was high) or a Neutron Star – if the mass was a bit lower. –The Neutron Star (and the Black Hole) will be spinning. IF the orientation of the spin axis, and magnetic fields – line up correctly – we can hear them in the Radio – they are Pulsars.

The first Pulsar was discovered by Jocelyn Bell. She was a Student when she found the Pulsar, so her professor got most of the Credit. Most people now give her the credit.

Sounds of Pulsars – Rapidly Spinning Neutron Stars Crab – Supernova in 1054 AD - ~ 30 rotations/sec PSR J an old pulsar ~ 174 rotations/sec PSR B period= sec rotations/sec PSR B Fastest Known – Period= sec ~642 rotations/sec the surface of the star is going about 1/7 the speed of light Vela – 10,000 years old – 89 millisecond – 11 rotations/sec

Disclaimer Aloha I put together these power points for use in my science classes. You may use them in your classes. Some images are public domain, some are used under the fair-use provisions of the copyright law, some are mine. Copyright is retained by the owners! Ted Brattstrom