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NGC 2548: clumpy spatial and kinematic structure in an intermediate-age galactic cluster

AutorVicente, Belen; Sanchez, Nestor; Alfaro, Emilio J.
Palabras claveStars: kinematics and dynamics
Open clusters and associations: general
Open clusters and associations: individual: NGC 2548
Fecha de publicación21-jun-2016
EditorOxford University Press
CitaciónMonthly Notices of the Royal Astronomical Society 461(3): 2519-2526 (2016)
ResumenNGC 2548 is a similar to 400-500 Myr old open cluster with evidence of spatial substructures likely caused by its interaction with the Galactic disc. In this work we use precise astrometric data from the Carte du Ciel - San Fernando (CdC-SF) catalogue to study the clumpy structure in this cluster. We confirm the fragmented structure of NGC 2548 but, additionally, the relatively high precision of our kinematic data lead us to the first detection of substructures in the proper motion space of a stellar cluster. There are three spatially separated cores each of which has its own counterpart in the proper motion distribution. The two main cores lie nearly parallel to the Galactic plane whereas the third one is significantly fainter than the others and it moves towards the Galactic plane separating from the rest of the cluster. We derive core positions and proper motions, as well as the stars belonging to each core.
Versión del editorhttp://dx.doi.org/10.1093/mnras/stw1487
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