Iron abundance gradient in the Milky Way found by Genovali et al. (2013, 2014) based on Cepheids (small black dots). The black line is the Galactic gradient (−0.06 dex kpc−1). Triangles represent young open clusters (< 500 Myr) studied by Netopil et al. (2016), Spina et al. (2017), Magrini et al. (2018), and Alonso-Santiago et al. (2017, 2018, 2019). Finally, the red circle is ASCC 123. All the values shown in this plot are rescaled to Genovali et al. (2014) values: R⊙ = 7.95 kpc and A(Fe) = 7.50.
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