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spectroscopy-basics

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Astronomical spectroscopy — line identification, redshift measurement, equivalent widths, and abundance basics.

skills/spectroscopy-basics/SKILL.md

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## Overview

Spectra spread light into wavelength, revealing composition, motion,
temperature, and density through lines. This skill covers the practical
spectroscopy chain: wavelength calibration, line identification,
measuring redshifts and equivalent widths, and the first steps of
abundance analysis — for stars, galaxies, and nebulae.

## When to use

- Measuring a redshift from galaxy or quasar emission/absorption lines
- Identifying lines in a stellar or nebular spectrum
- Measuring equivalent widths and line ratios for physical diagnostics
- Estimating stellar metallicity or nebular abundances
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