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Near IR, how do you see lines?

  1. Sep 11, 2006 #1
    Quick spectroscopy question: Say I am looking at the sun with a near IR /IR spectrometer? I know there is H2 and He in the sun, and I assume I will see their spectral lines? If true, how come I see that, and the signal is not drowned by the heat from the sun? (since it is so hot, using stefan-boltzman law, i can determine energy, etc etc)
  2. jcsd
  3. Sep 11, 2006 #2


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    Science Advisor

    The lines you will see are absorption lines (dark) from the cooler matter near the surface. The background spectrum is continuous and bright.
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