Actions are weak stellar age indicators in the Milky Way disk

16 Jul 2018Angus BeaneMelissa NessMegan Bedell

The orbital properties of stars in the disk are signatures of their formation, but they are also expected to change over time due to the dynamical evolution of the Galaxy. Stellar orbits can be quantified by three dynamical actions, J_r, L_z, and J_z, which provide measures of the orbital eccentricity, guiding radius, and non-planarity, respectively... (read more)

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