TY - JOUR
T1 - Diagnosing the Stellar Population and Tidal Structure of the Blanco 1 Star Cluster
AU - Zhang, Yu
AU - Tang, Shih Yun
AU - Chen, W. P.
AU - Pang, Xiaoying
AU - Liu, J. Z.
N1 - Publisher Copyright:
© 2020. The American Astronomical Society. All rights reserved.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - 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.
AB - 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.
KW - machine-readable table
UR - http://www.scopus.com/inward/record.url?scp=85081620466&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab63d4
DO - 10.3847/1538-4357/ab63d4
M3 - Article
AN - SCOPUS:85081620466
SN - 0004-637X
VL - 889
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 99
ER -