Dynamics of Tidally Perturbed, Rotating Stellar Systems

Lucy A.Z. Arditi; Anna Lisa Varri

Dynamics of Tidally Perturbed, Rotating Stellar Systems

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Recent observations have demonstrated that globular clusters are systems of greater kinematic and morphological complexity than can be described using spherical non-rotating dynamical models. Here, a new family of self-consistent equilibrium models for quasi-relaxed stellar systems is presented, treating for the first time the case of asynchronous rotation within an external tidal field. Their construction as a
perturbative expansion of the classical King models entails a free boundary problem, which is solved using matched asymptotics. The resulting equilibria are found to possess a triaxial structure whose aspherical distortion increases with increased asynchronicity. It is hoped that these models will provide a more realistic
equilibrium description for use in investigations of the internal structure and kinematics of star clusters.

Original language	English
Title of host publication	Proceedings of the International Astronomical Union
Publisher	Cambridge University Press
Publication status	Accepted/In press - 12 Oct 2025

Publication series

Name	Proceedings of the International Astronomical Union
Publisher	Cambridge University Press
ISSN (Print)	1743-9213
ISSN (Electronic)	1743-9221

Keywords / Materials (for Non-textual outputs)

globular clusters: general
stars: kinematics and dynamics
methods: analytical

1 Finished
1 Active

Rethinking the dynamical paradigm of low-mass stellar systems
Varri, A. L. (Principal Investigator) & Schroers, B. (Co-investigator)
UKRI (formerly RCUK)
1/05/23 → 30/04/28
Project: Research
Rethinking the dynamical paradigm of low-mass stellar systems
Varri, A. L. (Principal Investigator) & Gordon, I. (Co-investigator)
UKRI (formerly RCUK)
1/05/19 → 31/10/23
Project: Research

Cite this

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title = "Dynamics of Tidally Perturbed, Rotating Stellar Systems",

abstract = "Recent observations have demonstrated that globular clusters are systems of greater kinematic and morphological complexity than can be described using spherical non-rotating dynamical models. Here, a new family of self-consistent equilibrium models for quasi-relaxed stellar systems is presented, treating for the first time the case of asynchronous rotation within an external tidal field. Their construction as a perturbative expansion of the classical King models entails a free boundary problem, which is solved using matched asymptotics. The resulting equilibria are found to possess a triaxial structure whose aspherical distortion increases with increased asynchronicity. It is hoped that these models will provide a more realistic equilibrium description for use in investigations of the internal structure and kinematics of star clusters. ",

keywords = "globular clusters: general, stars: kinematics and dynamics, methods: analytical",

author = "Arditi, \{Lucy A.Z.\} and Varri, \{Anna Lisa\}",

year = "2025",

month = oct,

day = "12",

language = "English",

series = "Proceedings of the International Astronomical Union",

publisher = "Cambridge University Press",

booktitle = "Proceedings of the International Astronomical Union",

address = "United States",

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TY - GEN

T1 - Dynamics of Tidally Perturbed, Rotating Stellar Systems

AU - Arditi, Lucy A.Z.

AU - Varri, Anna Lisa

PY - 2025/10/12

Y1 - 2025/10/12

N2 - Recent observations have demonstrated that globular clusters are systems of greater kinematic and morphological complexity than can be described using spherical non-rotating dynamical models. Here, a new family of self-consistent equilibrium models for quasi-relaxed stellar systems is presented, treating for the first time the case of asynchronous rotation within an external tidal field. Their construction as a perturbative expansion of the classical King models entails a free boundary problem, which is solved using matched asymptotics. The resulting equilibria are found to possess a triaxial structure whose aspherical distortion increases with increased asynchronicity. It is hoped that these models will provide a more realistic equilibrium description for use in investigations of the internal structure and kinematics of star clusters.

AB - Recent observations have demonstrated that globular clusters are systems of greater kinematic and morphological complexity than can be described using spherical non-rotating dynamical models. Here, a new family of self-consistent equilibrium models for quasi-relaxed stellar systems is presented, treating for the first time the case of asynchronous rotation within an external tidal field. Their construction as a perturbative expansion of the classical King models entails a free boundary problem, which is solved using matched asymptotics. The resulting equilibria are found to possess a triaxial structure whose aspherical distortion increases with increased asynchronicity. It is hoped that these models will provide a more realistic equilibrium description for use in investigations of the internal structure and kinematics of star clusters.

KW - globular clusters: general

KW - stars: kinematics and dynamics

KW - methods: analytical

M3 - Conference contribution

T3 - Proceedings of the International Astronomical Union

BT - Proceedings of the International Astronomical Union

PB - Cambridge University Press

ER -

Dynamics of Tidally Perturbed, Rotating Stellar Systems

Abstract

Publication series

Keywords / Materials (for Non-textual outputs)

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Projects

Rethinking the dynamical paradigm of low-mass stellar systems

Rethinking the dynamical paradigm of low-mass stellar systems

Cite this