Issue |
A&A
Volume 693, January 2025
|
|
---|---|---|
Article Number | A175 | |
Number of page(s) | 13 | |
Section | Galactic structure, stellar clusters and populations | |
DOI | https://doi.org/10.1051/0004-6361/202451312 | |
Published online | 15 January 2025 |
The physical properties of cluster chains
1
University of Vienna, Department of Astrophysics,
Türkenschanzstrasse 17,
1180
Vienna,
Austria
2
University of Vienna, Research Network Data Science at Uni Vienna,
Kolingasse 14-16,
1090
Wien,
Austria
3
Czech Academy of Sciences,
Boční II 1401,
141 31
Prague 4,
Czech Republic
4
Physikalisches Institut, Universität zu Köln,
Zülpicher Str. 77,
50937
Köln,
Germany
5
Center for Astrophysics | Harvard & Smithsonian,
60 Garden St.,
Cambridge,
MA
02138,
USA
6
Department of Astronomy, Harvard University,
60 Garden St.,
Cambridge,
MA
02138,
USA
★ Corresponding author; laura.posch@univie.ac.at
Received:
29
June
2024
Accepted:
22
October
2024
We explore the kinematics and star formation history of the Scorpius Centaurus (Sco-Cen) OB association following the initial identification of sequential, linearly aligned chains of clusters. Building upon our characterization of the Corona Australis (CrA) chain, we now analyze two additional major cluster chains that exhibit similar characteristics: the Lower Centaurus Crux (LCC) and Upper Scorpius (Upper Sco) chains. All three cluster chains display distinct sequential patterns in (1) the 3D spatial distribution, (2) age, (3) velocity, and (4) mass. The Upper-Sco chain is the most massive and complex cluster chain, possibly consisting of two or more overlapping subchains. We discuss the possible formation of cluster chains and argue for a scenario where feedback from the most massive star formation episode 15 Myr ago initiated the formation of these spatio-temporal cluster sequences. Our results identify cluster chains as a distinct type of stellar structure with well-defined physical properties, formed in environments capable of sustaining stellar feedback over timescales of 5–10 Myr. We find that around 40% of the stellar population in Sco-Cen formed due to triggered star formation, with 35% forming along the three cluster chains. We conclude that cluster chains could be common structures in OB associations, particularly in regions that have similar natal environments as Sco-Cen. Beyond their significance for star formation and stellar feedback, they appear to be promising laboratories for chemical enrichment and the transport of elements from one generation to the next in the same star-forming region.
Key words: stars: formation / stars: kinematics and dynamics / ISM: kinematics and dynamics / open clusters and associations: individual: Scorpius-Centaurus
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.