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Light and Stellar SpectroscopyModule 4Infer the Physics of a Star
Module 4 / Lesson 20 of 3045 min
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Why Do Stellar Spectral Lines Become Broad?

How can rotation, thermal motion, turbulence, pressure, and the instrument produce distinguishable but overlapping profiles?

Compare complete line shapes and width budgets before assigning one physical cause.

A rotating star and moving atmospheric particles produce several visibly different absorption-line profiles.
Vastward scientific visualization. Similar widths can come from different physical and instrumental mechanisms.

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