English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We identify hierarchical structures in the Vela OB2 complex and the clusterpair Collinder 135 and UBC 7 with Gaia EDR3 using the neural network machinelearning algorithm StarGO. Five second-level substructures are disentangled inVela OB2, which are referred to as Huluwa 1 (Gamma Velorum), Huluwa 2, Huluwa3, Huluwa 4 and Huluwa 5. For the first time, Collinder 135 and UBC 7 aresimultaneously identified as constituent clusters of the pair with minimalmanual intervention. We propose an alternative scenario in which Huluwa 1-5have originated from sequential star formation. The older clusters Huluwa 1-3with an age of 10-22 Myr, generated stellar feedback to cause turbulence thatfostered the formation of the younger-generation Huluwa 4-5 (7-20 Myr). Asupernova explosion located inside the Vela IRAS shell quenched star formationin Huluwa 4-5 and rapidly expelled the remaining gas from the clusters. Thisresulted in global mass stratification across the shell, which is confirmed bythe regression discontinuity method. The stellar mass in the lower rim of theshell is $0.32\pm0.14$ $\rm M_\odot$ higher than in the upper rim. Local,cluster-scale mass segregation is observed in the lowest-mass cluster Huluwa 5.Huluwa 1-5 (in Vela OB2) are experiencing significant expansion, while thecluster pair suffers from moderate expansion. The velocity dispersions suggestthat all five groups (including Huluwa 1A and Huluwa 1B) in Vela OB2 and thecluster pair are supervirial and are undergoing disruption, and also thatHuluwa 1A and Huluwa 1B may be a coeval young cluster pair. N-body simulationspredict that Huluwa 1-5 in Vela OB2 and the cluster pair will continue toexpand in the future 100 Myr and eventually dissolve.

astrophysical journal/the astrophysical journal

Disruption of Hierarchical Clustering in the Vela OB2 Complex and the  Cluster Pair Collinder 135 and UBC7 with Gaia EDR3: Evidence of Supernova  Quenching