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Lecture 8

Lecture 8. Optical depth. Review: opacity. How does the intensity of radiation depend on opacity and distance travelled through a homogeneous medium? . Opacity ( k ) is a cross-section per unit mass (units m 2 /kg) of material for absorbing photons of a specific wavelength.

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Lecture 6

Lecture 6. The radiation field and opacity. Review. The main sequence is a mass sequence More massive stars are closer to the top-left (hot and bright). M=30M Sun. M=M Sun. M=0.2M Sun. Radiation intensity.

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Lecture 8

Lecture 6