Back to Light and Stellar SpectroscopyLesson 9 of 30
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C01

Light and Stellar SpectroscopyModule 2How Spectra Form
Module 2 / Lesson 9 of 3035 min
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What Do Line Depth and Width Mean?

Why can one line shape carry several overlapping physical effects?

Measure line centre, depth, and FWHM before testing abundance, temperature, pressure, motion, and instrument broadening.

A calibrated stellar spectrum line widens into several translucent profiles, suggesting temperature, pressure, motion, and instrument effects.
Vastward artistic reconstruction. Overlapping profiles represent competing broadening mechanisms rather than one uniquely solved star.

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