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Fig. 18.


α-enhancement, [α/Fe] with [Fe/H] in different age bins. Top left panel: distribution of all stars and mean angular momenta Lz are shown in bins with more than five stars. The other panels show the stars bins of stellar age, ranging from above 13 Gyr (second left panel) to below 2 Gyr (bottom right panel). Colour indicates the angular momentum of each star, estimated in Sect. 3.6. The text in each panel indicates the age and respective number of stars. Fiducial lines indicate the low-α and high-α sequences to guide the eye. This plot shows, that stars with high-α enhancement have generally lower angular momentum, while stars in the low-α sequence, have mostly solar momentum. We note however that the metal-rich low-α stars have in general lower angular momenta than metal-poor stars with comparable α-enhancement. For a detailed discussion of the panels see Sect. 5.

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