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Model and observed spectral feature indices indicate that, in galaxies of all types with velocity dispersions larger than about 225 km s−1, Mg/Fe progressively drifts greater than zero, until it reaches about 0.3 in the largest ellipticals. For elliptical galaxies that have absorption‐line data for more elements, the abundances of Na and N elevate in a similar fashion, relative to both Ca and Fe (Ca/Fe ≈ 0; Na, N/Fe progressively > 0). Titanium may also share this apparently generic light‐element behavior.
Guy Worthey (Sat,) studied this question.
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