Discovery of new stellar groups in the Orion complex

@article{Chen2019DiscoveryON,
  title={Discovery of new stellar groups in the Orion complex},
  author={Boquan Chen and Elena D’Onghia and Jo{\~a}o Alves and Angela Adamo},
  journal={arXiv: Astrophysics of Galaxies},
  year={2019}
}
We test the ability of two unsupervised machine learning algorithms, \textit{EnLink} and Shared Nearest Neighbour (SNN), to identify stellar groupings in the Orion star-forming complex as an application to the 5-dimensional astrometric data from \textit{Gaia} DR2. The algorithms represent two distinct approaches to limiting user bias when selecting parameter values and evaluating the relative weights among astrometric parameters. \textit{EnLink} adopts a locally adaptive distance metric and… 

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