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In Galactic studies a distinction is made between (open) star clusters and associations. For barely resolved objects at a distance of several Mpc this distinction is not trivial to make.
Chemical pattern across the young associations ONC and OB1b
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
Abundances of iron-peak and alpha-elements are poorly known in Orion, and the available measurements yield contradictory results. Aims. We measure accurate and homogeneous elemental abundances of the ...