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A Concise Introduction to Astrophysics

A Concise Introduction to Astrophysics Lecture Notes for FY2450 M. Kachelrie M. Kachelrie Institutt for fysikkNTNU, TrondheimNorwayemail: M. Kachelrie 2008, minor corrections Stellar astrophysics101 Continuous radiation from Brightness of stars .. Color of stars .. Black-body radiation .. Kirchhoff-Planck distribution .. Wien s displacement law .. Stefan-Boltzmann law .. Spectral energy density of a photon gas .. Stellar distances .. Stellar luminosity and absolute magnitude scale .. 182 Spectral lines and their Bohr-Sommerfeld model for hydrogen-like atoms.

– The need for a new form of “dark matter” to describe correctly the formation and dynamics of galaxies requires a yet unknown extension of the current standard model of elementary particle physics. The same holds true for a new form of ”dark energy” required for the explanation of the accelerated expansion of the universe.

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