Star-by-star dynamical evolution of the physical pair of the Collinder 135 and UBC 7 open clusters
arxiv(2024)
Abstract
In a previous paper using Gaia DR2 data, we demonstrated that the two closely
situated open clusters Collinder 135 and UBC 7 might have formed together about
50 Myr ago. In this work, we performed star-by-star dynamical modelling of the
evolution of the open clusters Collinder 135 and UBC 7 from their supposed
initial state to their present-day state, reproducing observational
distributions of members. Modelling of the Collinder 135 and UBC 7 dynamical
evolution was done using the high-order parallel N-body code ϕ-GPU with
up-to-date stellar evolution. Membership and characteristics of the clusters
were acquired based on Gaia DR3 data. The comparison of the present-day radial
cumulative star count obtained from the N-body simulations with the current
observational data gave us full consistency of the model with observational
data, especially in the central 8 pc, where 80
motion velocity components obtained from the N-body simulations of the stars
are also quite consistent with the observed distributions and error bars. These
results show that our numerical modelling is able to reproduce the open
clusters' current complex 6D observed phase-space distributions with a high
level of confidence. Thus, the model demonstrates that the hypothesis of a
common origin of Collinder 135 and UBC 7 complies with present-day
observational data.
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