Interferometric, photoelectric scans of the interstellar calcium K-lines in the spectra of 65 stars are presented. The scans were obtained with a PEPSIOS spectrometer having a passband with a full half-intensity width of 1.0 kms(-1) or 0.013A. The fivefold improvement in resolution over that used by Adams reveals numerous line components which correspond very well to those of the interstellar sodium lines, apart from frequent differences in relative intensities.
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Marschall, Laurence A., and L.M. Hobbs. Interferometric Studies of Interstellar Calcium Lines. The Astrophysical Journal. (April 1972) 173(1):43-62.
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