The Gaia-ESO Survey: 3D dynamics of young groups and clusters from GES and Gaia EDR3
Nicholas J Wright,
R D Jeffries,
R J Jackson
et al.
Abstract:We present the first large-scale 3D kinematic study of ∼2700 spectroscopically-confirmed young stars (< 20 Myr) in 18 star clusters and OB associations (hereafter groups) from the combination of Gaia astrometry and Gaia-ESO Survey spectroscopy. We measure 3D velocity dispersions for all groups, which range from 0.61 to 7.4 km s−1 (1D velocity dispersions of 0.35 to 4.3 km s−1). We find the majority of groups have anisotropic velocity dispersions, suggesting they are not dynamically relaxed. From the 3D … Show more
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