Topic 3.4 - Evolution of Stars 0.0 / 5 ? AstronomyEvolution of StarsGCSEEdexcel Created by: goldstar3Created on: 04-06-18 21:41 A) Birth of Stars Stars formed from clouds of gas and dust called nebulae Breaks down to protostars GPE to KE Temp reaches 15 million K Nuclear fusion begins Outward pressure stops collapse Begins to radiate energy Is now main sequence 1 of 6 B) Emission nebulae, absorption nebulae, open clusters All associated with birth of stars 2 of 6 C) Planetary Nebulae associated with birth of stars 3 of 6 D) Neutron Stars Neutron stars have masses slightly greater than the Sun's Have a diameter of just 20km High density Strong gravitational effect Rotates rapidly on axis Pulsars emit pulses of radio waves Intense radio waves from polar regions 4 of 6 D) Black Holes When stars greater than 3 solar masses High density and gravitational pull EM radiation unable to escape 5 of 6 E) Evidence of neutron stars & black holes X-ray sources produced by accretion discsGas pulled off visible star in binary star systems Gas in orbit around black hole Friction heats the gas to be detected by x-rays Neutron stars detected as pulsars 6 of 6
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