Middleweight Stars 4-12 solar masses.

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Presentation transcript:

Middleweight Stars 4-12 solar masses

Carbon nuclei attempt fusion Electrons and protons fuse to become neutrons. Outer layers are ejected due to backward pressures.

Two results: Rapidly rotating neutron star- large magnetic field. A)If no companion, star may collapse on itself catastrophically. Type II Supernova (1054A.D. Crab Nebula was first seen. )

B) If neutron star has companion, charge particles collide on NS due to B-field. The released energy radiates away from the star. The rapid rotation periodically “pulses” Pulsars (When the energy radiates in the X-Ray region, they call it an X-ray pulsar.

Pulsars can exist in other electromagnetic regions. Radio, x-ray (hercules X-1)

Greater than 12 solar masses Heavyweight Stars Greater than 12 solar masses

Star allows fusion beyond carbon. Iron nuclei form in the core. Core collapses due to intense gravity. Backward radiation blows lighter elements Nucleosynthesis- formation of heavier elements from lighter due to the shockwave of the explosion.

The core’s gravity becomes very intense. When gravitational field becomes so intense, light cannot escape. Blackhole is formed.

Stellar remnants Planetary nebula White Dwarf Black dwarf or Type I supernova Neutron star Type II supernova Black hole

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