Kinematics of the Optically Visible YSOs Toward the Orion B Molecular Cloud

Abstract

We present results from high resolution optical spectra toward 66 young stars in the Orion B molecular cloud to study their kinematics and other properties. Observations of the H$\alpha$ and Li I 6707 Å lines are used to check membership and accretion properties. While the stellar radial velocities of in NGC 2068 and L1622 show good agreement with that of the molecular gas, many of the stars in NGC 2024 show a considerable offset. This could be a signature of either expansion of the cluster, high degree of the ejection of the stars from the cluster through the dynamical interaction, or the acceleration of the gas due to stellar feedback.

Accepted to ApJ; 8 pages, 9 figures

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• Dynamical dust traps in misaligned circumbinary discs: analytical theory and numerical simulations
• The NEMESIS Catalogue of Young Stellar Objects for the Orion Star Formation Complex. I. General description of data curation
• Kinematics of young stellar objects in NGC 2024 based on infrared proper motions