| 11. | Violet hue can occur when the spectrum contains emission lines of atomic hydrogen.
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| 12. | It is a hot luminous star with strong emission lines in its spectrum.
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| 13. | It also shows some emission lines in its spectrum.
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| 14. | It is detected through its spectral emission lines.
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| 15. | Balmer lines can appear as planetary nebulae, the Balmer lines are emission lines.
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| 16. | Helium emission lines sometimes show P Cygni profiles.
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| 17. | At this point the characteristic atomic emission lines of the elements can be observed.
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| 18. | These appear point-like and can be identified by their spectral emission lines.
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| 19. | In the Crab Nebula ArH + occurs in several spots revealed by emission lines.
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| 20. | They exhibit broad emission line spectra with helium, nitrogen, carbon and oxygen lines.
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