metallic-lineadj.Astronomy designating a main-sequence star whose spectrum shows unusually strong absorption lines for many of the heavier elements, including rare earths.
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1943 W. W. Morgan et al. Atlas Stellar Spectra 19 (heading) The metallic-line stars.
1992 S. P. MaranAstron. & Astrophysics Encycl. 730/2 Among the dwarfs,..the slowly rotating classical metallic-line A stars are generally stable or show only very small amplitudes of a few thousandths of a magnitude.