Kinematic complexity around NGC 419: resolving the proper motion of the cluster, the Small Magellanic Cloud, and the Magellanic bridge
Date Issued
2021
Author(s)
Abstract
We present Hubble Space Telescope proper motions in the direction of the star cluster NGC 419 in the Small Magellanic Cloud. Because of the high precision of our measurements, for the first time it is possible to resolve the complex kinematics of the stellar populations located in the field, even along the tangential direction. In fact, the proper motions we measured allow us to separate cluster stars, which move on average with ($\mu _{\alpha }\cos \delta ^{\rm NGC\, 419}, \mu _{\delta }^{\rm NGC\, 419}$) = (+0.878 ± 0.055, -1.246 ± 0.048) mas yr-1, from those of the Small Magellanic Cloud and those belonging to a third kinematic feature that we recognize as part of the Magellanic Bridge. Resolving such a kinematic complexity enables the construction of decontaminated colour-magnitude diagrams, as well as the measurement of the absolute proper motion of the three separate components. Our study therefore sets the first steps towards the possibility of dynamically investigating the Magellanic system by exploiting the resolved kinematics of its stellar clusters.
Volume
500
Issue
2
Start page
2012
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.500.2012M
Rights
open.access
File(s)![Thumbnail Image]()
![Thumbnail Image]()
Loading...
Name
staa3497.pdf
Description
Pdf editoriale
Size
2.49 MB
Format
Adobe PDF
Checksum (MD5)
3012dd016b01884d95aaaae4fa49c38d
Loading...
Name
Massari21.pdf
Size
9.39 MB
Format
Adobe PDF
Checksum (MD5)
846f93b03d1033b7422baf2c5580656b