Neutron-Stars By Kraml E. 09.01.2017.

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Presentation transcript:

Neutron-Stars By Kraml E. 09.01.2017

A Neutron-Star (not actually) The Sun Source: NASA

A Neutron-Star

Comparison Diameter: Mass: Density: 1.4 x 10^6 km Diameter: Mass: 2 x 10^30 kg 4 x 10^30 kg (2x Ms) 1410 kg/m³ 6 x 10^17 kg/m³ (4 x 10^14x Density of Sun)

Formation Main sequence star > 8 Ms Nuclear processes lead to iron core Shell-burning mass deposits causes core to exeed Chandrasekhar-limit Increased temperature > 5 x 10^9 K leads to photodisintegration Electrons and Protons combine to Neutrons -> Releasing Neutrinos Neutron degeneracy pressure stops contraction, Neutrinos are flung outward creating a supernova By Richard Powell

Formation alternatives Starting mass < 0.5 Ms -> Cannot start Helium-burning Starting mass < 8 Ms -> White Dwarf Starting mass between 8 – 12 Ms -> Neutron star with 1.25 Ms Remnant mass > 3-5 Ms -> Black hole Maximum observed mass of neutron stars is 2.01 Ms

Gravity by Corwin Zahn

Magnetic field On Earth: Medical MRI: 1.5 – 3 T HighRes MRI: 7 – 9.4 T Levitating Frog: 16 T Laboratory, continous: 45 T Laboratory, pulse(non-destructive): 100T Laboratroy , pulse: 10^3 T Neutron Star: 10^4 – 10^11 T Magnetar: 10^8 – 10^11 T

Radiation Non-pulsating neutron star Pulsars (pulsating radio star) Radio-quiet neutron star Source: Wikipedia

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