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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 measurement of the distance to Venus 1761 and 1769 during its transits of the Sun with the help of the first global measurement campaign and to the nearest stars 1838 by Bessel using trigonometric parallaxes established the first rungs in the “cosmic distance ladder.”

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