NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-15 T14:26:24 PDT
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For refcode 1990AJ.....99..323B:
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Copyright by American Astronomical Society. Reproduced by permission
1990AJ.....99..323B ESTIMATION OF THE EQUIVALENT WIDTH OF THE INTERSTELLAR Ca II K ABSORPTION LINE TIMOTHY C. BEERS Department of Physics and Astronomy, Michigan State University, E. Lansing, Michigan 48824 Received 16 August 1989;revised 12 September 1989 ABSTRACT Literature values for the equivalent width of the interstellar absorption line of Ca II K (3933 A) are used to constrain a simple empirical model for the strength of this line as a function of distance from the galactic plane. The best-fit model has an integrated Ca II K equivalent width in the direction perpendicular to the galactic plane of approximately 200 mA and a "scale height" of approximately 1100 pc. Such a model is useful for estimating (and correcting for) the contribution of the interstellar Ca II K feature to the total observed Ca II K line strength in the spectra of metal-deficient stars in the galactic halo.
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