Estimation of the equivalent width of the interstellar CA II K absorption line

Details Estimation of the equivalent width of the interstellar CA II K absorption line Estimation of the equivalent width of the interstellar CA II K absorption line

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..323b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 323-329.

Astronomy and Astrophysics

Astronomy

14

Absorption Spectra, Globular Clusters, Line Spectra, Potassium, Stellar Spectra, Abundance, Chemical Composition, Halos, Line Shape, Metallic Stars, Signal To Noise Ratios

Scientific paper

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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