The Fate of the Sun - The Fate of the Sun In the center of a star the temperature is very high o Hydrogen atoms are fully ionized to protons o

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The Fate of the Sun In the center of a star, the temperature is very high o Hydrogen atoms are fully ionized to protons o Basic reaction o 2 of the protons turned into neutron + positrons; positrons annihilated electrons o Only .7% of the mass is converted into energy o Energy of an atom whose electron is closer to the nucleus is lower o mass difference that is converted into energy Gamma rays emitted in nuclear fusion o Electron transfer – usually optical, infrared, or ultraviolet is emitted In the Sun, nearly 700 million tons of protons are being converted to helium nuclei each second o only .7% is converted to energy Sun’s main-sequence life about 10 billion years old photons take about 10^5 years to leak out : opaque Death of Stars o In equilibrium – not growing bigger or shrinking o A helium core builds up to 1/10 mass of the star o No nuclear reactions in core, so it contracts in order to replenish the lost heat hydrogen burning shell around helium core gets hotter
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/04/2008 for the course ASTRO C 10 taught by Professor Filippenko during the Fall '08 term at University of California, Berkeley.

Page1 / 2

The Fate of the Sun - The Fate of the Sun In the center of a star the temperature is very high o Hydrogen atoms are fully ionized to protons o

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online