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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

IMPACT FACTOR 2018: 0.350

CiteScore 2018: 0.24

SCImago Journal Rank (SJR) 2018: 0.202
Source Normalized Impact per Paper (SNIP) 2018: 0.144

ICV 2018: 120.66

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Volume 24, Issue 2


On the Formation of Tails in the Galactic Tidal Field

A. Davydenko
  • Department of Space Technologies and Applied Astrodynamics, Faculty of Applied Mathematics and Control Processes, St.-Petersburg State University, Universitetskij prospekt 35, Petergof, St.-Petersburg, Russian Federation
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Published Online: 2017-02-18 | DOI: https://doi.org/10.1515/astro-2017-0213


The trajectories of stars of a cluster moving in the Schuster-Plummer potential on a circular orbit in the Galactic plane (Bok’s problem) are investigated. The impact of initial conditions on stellar motions, in particular on the possibility of escape of a star from the cluster, is analyzed, and numerous computations of stellar orbits are performed for various initial values of energy and momentum with respect to the cluster. Stars escaping from the cluster are shown to move mostly in spiral orbits and form well-defined spiral tails.

Keywords: methods: numerical; Galaxy: kinematics and dynamics


  • Bok B. J. 1934, Circ. Harvard Obs., vol. 8, No. 384, 1Google Scholar

  • Davydenko A. A., Ossipkov L. P. 2004, ASP Conf. Ser., 316, 186Google Scholar

  • Davydenko A. A. 2013, Bull. Udmurt Univ., ser. 1: Mathematics, Mechanics, Computer Science, No. 2, 59 (in Russian)Google Scholar

  • Hill G. W. 1878, Amer. J. Math., 1, 5Google Scholar

  • Ossipkov L. P. 2003, in Mathematical Methods for Investigation of Cosmic Systems), Univ. St-Petersburg, p. 73 (in Russian)Google Scholar

About the article

Received: 2015-03-25

Accepted: 2015-04-20

Published Online: 2017-02-18

Published in Print: 2015-06-01

Citation Information: Open Astronomy, Volume 24, Issue 2, Pages 144–149, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0213.

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© 2015 A. Davydenko, published by De Gruyter Open. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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