Abstract
We present the stellar population, using Gaia DR2 parallax, kinematics, and photometry, of the young (∼100 Myr), nearby (∼230 pc) open cluster, Blanco 1. A total of 644 member candidates are identified via the unsupervised machine learning method StarGO to find the clustering in the five-dimensional position and proper motion parameter (X, Y, Z, α cos δ , μ δ) space. Within the tidal radius of 10.0 ± 0.3 pc, there are 488 member candidates, 3 times more than those outside. A leading tail and a trailing tail, each of 50-60 pc in the Galactic plane, are found for the first time for this cluster, with stars further from the cluster center streaming away faster, manifest stellar stripping. Blanco 1 has a total detected mass of 285 ± 32 M o with a mass function consistent with a slope of α = 1.35 ± 0.2 in the sense of, in the mass range of 0.25-2.51 M o, where N is the number of members and m is stellar mass. A minimum spanning tree (ΛMSR) analysis shows the cluster to be moderately mass segregated among the most massive members (⪆1.4 M o), suggesting an early stage of dynamical disintegration.
Original language | English |
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Article number | 99 |
Journal | Astrophysical Journal |
Volume | 889 |
Issue number | 2 |
DOIs | |
State | Published - 1 Feb 2020 |
Keywords
- machine-readable table
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Gaia DR2 Blanco 1 member candidates
Zhang, Y. (Creator), Tang, S.-Y. (Creator), Chen, W. P. (Creator), Pang, X. (Creator) & Liu, J. Z. (Creator), Strasbourg Astronomical Data Center, 2020
DOI: 10.26093/cds/vizier.18890099, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/99
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