Physics 231: Section 2 The Physics of Astrophysics 1 Phys 231, Topic 2: The Physics of Astrophysics

Phys 231, Topic 2: The Physics of Astrophysics

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Physics 231: Section 2The Physics of Astrophysics

http://mimas.physics.drexel.edu/phys231

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Two-Body Interaction

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Orbits follow conic sectionsUnbound

Bound

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Kepler’s 1st and 2nd Laws

Each purple region has the same area and is swept out in equal time

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Gravity from an extended (spherical) distribution

A “sees” mass 1+mass 2B “sees” only mass 1

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Rotation curve of the Milky Way

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v

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Waves interfere with one another

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The Wave Nature of Light

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Electromagnetic Waves

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Newton’s Double Prism experiment

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The Electromagnetic Spectrum

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The Solar Spectrum

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SDSS Response Function

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Spectral lines of some common elements

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Kirchoff’s Spectroscopy Laws

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Doppler Shift

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Maxwell-Boltzmann Distribution

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The RHS of the SAHA equation

Solar Densities

Earth AtmosphericDensities

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Ionization fraction of hydrogen

Solar

Earth