Mon. Not. R. Astron. Soc., 466, 3077-3087 (2017/April-2)
Young stars in the periphery of the Large Magellanic Cloud.
MONI BIDIN C., CASETTI-DINESCU D.I., GIRARD T.M., ZHANG L., MENDEZ R.A., VIEIRA K., KORCHAGIN V.I. and VAN ALTENA W.F.
Abstract (from CDS):
Despite their close proximity, the complex interplay between the two Magellanic Clouds, the Milky Way and the resulting tidal features, is still poorly understood. Recent studies have shown that the Large Magellanic Cloud (LMC) has a very extended disc strikingly perturbed in its outskirts. We search for recent star formation in the far outskirts of the LMC, out to ∼30° from its centre. We have collected intermediate-resolution spectra of 31 young star candidates in the periphery of the LMC and measured their radial velocity, stellar parameters, distance and age. Our measurements confirm membership to the LMC of six targets, for which the radial velocity and distance values match well with those of the Cloud. These objects are all young (10-50 Myr), main-sequence stars, projected between 7° and 13° from the centre of the parent galaxy. We compare the velocities of our stars with those of a disc model, and find that our stars have low to moderate velocity differences with the disc model predictions, indicating that they were formed in situ. Our study demonstrates that recent star formation occurred in the far periphery of the LMC, where thus far only old objects were known. The spatial configuration of these newly formed stars appears ring-like with a radius of 12 kpc and a displacement of 2.6 kpc from the LMC's centre. This structure, if real, would be suggestive of a star formation episode triggered by an off-centre collision between the Small Magellanic Cloud and the LMC's disc.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
stars: early-type - Magellanic Clouds - Magellanic Clouds
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