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In-situ Star Formation in the Outskirts of the Large Magellanic Cloud: Gaia DR2 Confirmation
Dana I Casetti-Dinescu1,2,3, Terrence M Girard4, Christian Moni Bidin5
1Physics Department, Southern Connecticut State University, 501 Crescent Street, New Haven, CT 06515, USA; dana.casetti@gmail.com.
Abstract:
We explore the Gaia data release 2 (DR2) proper motions of six young, main-sequence stars, members of the Large Magellanic Cloud (LMC) reported by Moni Bidin et al. These stars are located in the outskirts of the disk, between 7° and 13° from the LMC's center where there is very low H I content. Gaia DR2 proper motions confirm that four stars formed locally, in situ, while two are consistent with being expelled via dynamical interactions from inner, more gas-rich regions of the LMC. This finding establishes that recent star formation occurred in the periphery of the LMC, where thus far only old populations were known.
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