Spectrum of 'normal' stars

Thermal continuum and absorption lines

Very hot stars - apparition of emission lines

Very cold stars - metallic and oxydes molecular bands

Extremely cold stars - molecular bands: metalic, oxydes, water, lithium, methane

Wolf Rayet spectrum

Spectrum of double stars - Distinction by Doppler effect

Emission nebula - No continuum + H, He lines + Forbidden lines O II, O III, and N II spectra.

P Cignii spectrum - continuum + red emission line + blue absorbtion line

Be star spectrum - continuum + emission/absorbtion line + rotational effect

Active galaxy spectrum - continuum + Emission nebula lines with doppler effect

Nova spectrum - continuum + very variable and very strong large emission lines

Supernovae spectrum - continuum + large emission or absorbtion lines with Doppler effect

Comet spectrum - Solar continuum + emission molecular bands

Saturn spectrum - in reflection