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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 .. Formation of spectral lines .. Hertzsprung-Russel diagram .. 233 Telescopes and other Optical telescopes .. Characteristics of telescopes .. Problems and limitations .. Other wave-length ranges .. Going beyond electromagnetic radiation.

The response of the human eye is not linear but close to logarithmic to ensure a large dynamical range. With the use of photographic plates, the magnitude scale could be defined 1 …

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