Top panel: [α/Fe] vs. age for stars in the sample. The solid black line separates the thin and thick disk populations. The yellow dots represent the oldest stars that are on the thin disk sequence in the [α/Fe]–[Fe/H] plane (see the lower panel), and for which age could be determined. These objects fall in the part of the age–[α/Fe] distribution that corresponds to the thick disk (above the line). Bottom panel: [α/Fe] vs. [Fe/H] for the same sample and with the symbols indicating the same population of stars as above. This illustrates how the two sequences are separated in this plane.
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