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Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters -- I. Catalogues and results for NGC 1850

Niederhofer, F, Bellini, A, Kozhurina-Platais, V, Libralato, M, Häberle, M, Kacharov, N, Kamann, S, Bastian, N, Cabrera-Ziri, I, Cioni, M-RL, Dresbach, F, Martocchia, S, Massari, D and Saracino, S Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters -- I. Catalogues and results for NGC 1850. Astronomy & Astrophysics. ISSN 0004-6361 (Accepted)

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We present proper motion (PM) measurements for a sample of 23 massive star clusters within the Large Magellanic Cloud using multiepoch data from the Hubble Space Telescope (HST). We combined archival data from the ACS/WFC and WFC3/UVIS instruments with observations from a dedicated HST programme, resulting in time baselines between 4.7 and 18.2 yr available for PM determinations. For bright well-measured stars, we achieved nominal PM precisions of 55 µas yr−1 down to 11 µas yr−1.To demonstrate the potential and limitations of our PM data set, we analysed the cluster NGC 1850 and showcase a selection of different science applications. The precision of the PM measurements allows us to disentangle the kinematics of the various stellar populations that are present in the HST field. The cluster has a centre-of-mass motion that is different from the surrounding old field stars and also differs from the mean motion of a close-by group of very young stars. We determined the velocity dispersion of field stars to be 0.128±0.003 mas yr−1 (corresponding to 30.3±0.7 km s−1). The velocity dispersion of the cluster inferred from the PM data set most probably overestimates the true value, suggesting that the precision of the measurements at this stage is not sufficient for a reliable analysis of the internal kinematics of extra-galactic star clusters. Finally, we exploit the PM-cleaned catalogue of likely cluster members to determine any radial segregation between fast and slowly-rotating stars, finding that the former are more centrally concentrated. With this paper, we also release the astro-photometric catalogues for each cluster.

Item Type: Article
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
SWORD Depositor: A Symplectic
Date Deposited: 01 Jul 2024 09:51
Last Modified: 01 Jul 2024 09:51
DOI or ID number: 10.1051/0004-6361/202450255
URI: https://researchonline.ljmu.ac.uk/id/eprint/23666
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