SOLVED:Use the information in Example 1.5 from "The Classification of Stellar Spectra" to calculate the ratio of doubly to singly ionized calcium atoms (Ca III/Ca II) in the Sun's photosphere. The ionization energy of Ca II is χII=11.9 eV . Use ZIII=1 for the partition function of Ca III. Is your result consistent with the statement in Example 1.5 that in the solar photosphere, "nearly all of the calcium atoms are available for forming the H and K lines of calcium"?

Module 7 The Nature of Light: Spectra of Stars – HSC Physics

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