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Journal Article

Discovery of Tidal Tails in Disrupting Open Clusters: Coma Berenices and a Neighbor Stellar Group

MPS-Authors

Tang,  Shih-Yun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pang,  Xiaoying
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yuan,  Zhen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chen,  W. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hong,  Jongsuk
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Goldman,  Bertrand
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Just,  Andreas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shukirgaliyev,  Bekdaulet
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lin,  Chien-Cheng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...877...12T
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Citation

Tang, S.-Y., Pang, X., Yuan, Z., Chen, W. P., Hong, J., Goldman, B., et al. (2019). Discovery of Tidal Tails in Disrupting Open Clusters: Coma Berenices and a Neighbor Stellar Group. The Astrophysical Journal, 877.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CFAA-3
Abstract
We report the discovery of tidal structures around the intermediate-aged (∼700-800 Myr), nearby (∼85 pc) star cluster Coma Berenices. The spatial and kinematic grouping of stars is determined with the Gaia DR2 parallax and proper motion data, by a clustering analysis tool, STARGO, to map 5D parameters (X, Y, Z, {μ }α \cos δ ,{μ }δ ) onto a 2D neural network. Leading and trailing tails, each with an extension of ∼50 pc are revealed for the first time around this disrupting star cluster. The cluster members, totaling ∼ {115}-3+5 {M}ȯ , are clearly mass-segregated, and exhibit a flat mass function with α ∼ 0.79 ± 0.16, in the sense of dN/dm ∝ m −α , where N is the number of member stars and m is stellar mass, in the mass range of m = 0.25-2.51 M ☉. Within the tidal radius of ∼6.9 pc, there are 77 member candidates with an average position, i.e., the cluster center, of R.A. = 186.°8110, and decl. = 25.°8112, and an average distance of 85.8 pc. Additional 120 member candidates reside in the tidal structures, i.e., outnumbering those in the cluster core. The expansion of escaping members lead to an anisotropy in the velocity field of the tidal tails. Our analysis also serendipitously uncovers an adjacent stellar group, part of which has been cataloged in the literature. We identify 218 member candidates, 10 times more than previously known. This star group is some 65 pc away from, and ∼400 Myr younger than, Coma Ber, but is already at the final stage of disruption.