Diagnosing Open Cluster Stock 2: Member Candidates and Mass Distribution with Gaia DR2 and LAMOST

Abstract We identify 1325 member candidates of the open cluster (OC) Stock 2 using data from Gaia DR2. We use the algorithms Clusterix 2.0 and HDBSCAN to select cluster candidates and further refine the final cluster membership by defining neighbors in 5D phase space ( X cp ,  Y cp , / ϖ ,  κ  ·  μ...

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Bibliographic Details
Published in:The Astronomical journal 2021-01, Vol.161 (1), p.8
Main Authors: Ye, Xianhao, Zhao, Jingkun, Liu, Jiaming, Bird, Sarah A., Liu, Chao, Liang, Xilong, Zhang, Jiajun, Zhao, Gang
Format: Article
Language:English
Subjects:
ALGORITHMS
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DENSITY
Empirical analysis
FIBERS
MASS DISTRIBUTION
Open star clusters
OTHER INSTRUMENTATION
PHASE SPACE
RESOLUTION
Spatial distribution
Spectroscopic telescopes
Star clusters
STARS
TELESCOPES
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Summary:Abstract We identify 1325 member candidates of the open cluster (OC) Stock 2 using data from Gaia DR2. We use the algorithms Clusterix 2.0 and HDBSCAN to select cluster candidates and further refine the final cluster membership by defining neighbors in 5D phase space ( X cp ,  Y cp , / ϖ ,  κ  ·  μ δ / ϖ ). Among these candidates, less than half have G , G BP , and G RP extinctions from Gaia. When Gaia extinctions are unavailable, we compute extiction using empirical formulas and E ( B  −  V ) = 0.350. We analyze the spatial distribution and mass profile of Stock 2. Our results reveal Stock 2 is still a bound OC and we find evidence of mass segregation. By comparing initial mass functions, the present-day mass function indicates that Stock 2 is a massive stellar cluster with a mass of 4000 M ⊙ . The core radius and tidal radius, calculated via the radial density profile and total mass, are 3.97 pc and 22.65 pc, respectively. Common stars between our selected member candidates and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope DR7 medium-resolution catalog give a metalliclity of [Fe/H] = −0.040 ± 0.147.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.3847/1538-3881/abc61a