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Unformatted text preview: o Star is Born • Once nuclear reaction begins, gravitational energy stops acting as the primary force o Contraction Ceases Star’s L and T don’t change much during main-sequence lifetime • Contracting pre-main-sequence star = Gravitational Energy • Star – Nuclear Energy • Mechanical balance: “hydrostatic equilibrium” = Stable o gravity exerted and the pressure from inside are equal • Brown Dwarf – no long-term fusion o fusion occurs for a short time o not hot enough to fuse hydrogen, deuterium fusion does occur though o held up by degeneracy pressure o faintly glow at infrared wavelengths • Center of a star has a very high temperature o Hydrogen atomrs are fully ionized to protons o nuclear fusion produces energy...
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This note was uploaded on 04/04/2008 for the course ASTRO C 10 taught by Professor Filippenko during the Fall '08 term at Berkeley.
- Fall '08