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Related papers: MOCCA-SURVEY database I. Accreting white dwarf bin…

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The formation and evolution of X-ray sources in globular clusters is likely to be affected by the cluster internal dynamics and the stellar interactions in the cluster dense environment.Several observational studies have revealed a…

Astrophysics of Galaxies · Physics 2016-11-15 Jongsuk Hong , Enrico Vesperini , Diogo Belloni , Mirek Giersz

In dense stellar systems the frequent dynamical interactions between stars play a crucial role in the formation and evolution of compact binaries. We study these processes using a novel approach combining a state-of-the-art binary…

Astrophysics · Physics 2007-05-23 N. Ivanova , F. A. Rasio

We present 22 new (+3 confirmed) cataclysmic variables (CVs) in the non core-collapsed globular cluster 47 Tucanae (47 Tuc). The total number of CVs in the cluster is now 43, the largest sample in any globular cluster so far. For the…

We will discuss the evolution of star clusters with an large initial binary fraction, up to 95%. The initial binary population is chosen to follow the invariant orbital-parameter distributions suggested by Kroupa (1995). The Monte Carlo…

Astrophysics of Galaxies · Physics 2014-12-01 Mirek Giersz , Nathan Leigh , Michael Marks , Arkadiusz Hypki , Abbas Askar

A comprehensive study of the co-evolution of globular cluster systems (GCS) in galaxies requires the ability to model both the large scale dynamics (0.01 - 10 kpc) regulating their orbital evolution, and the small scale dynamics (sub-pc -…

Astrophysics of Galaxies · Physics 2022-06-29 A. Leveque , M. Giersz , M. Arca-Sedda , A. Askar

Colour-magnitude diagrams (CMDs) are powerful tools that might be used to infer stellar properties in globular clusters (GCs), for example, the binary fraction and their mass ratio ($q$) distribution. In the past few years, observations…

Astrophysics of Galaxies · Physics 2017-07-17 Diogo Belloni , Abbas Askar , Mirek Giersz , Pavel Kroupa , Helio J. Rocha-Pinto

Binary evolution theory predicts that accreting white dwarfs with sub-stellar companions dominate the Galactic population of cataclysmic variables (CVs). In order to test these predictions, it is necessary to identify these systems, which…

Solar and Stellar Astrophysics · Physics 2018-01-31 J. V. Hernandez Santisteban , C. Knigge , M. L. Pretorius , M. Sullivan , B. Warner

The presence of multiple stellar populations in globular clusters leads to a complex dynamical environment that significantly influences the evolution of binary stars, which in turn impacts the evolution of the cluster itself. For this…

Astrophysics of Galaxies · Physics 2026-02-10 J. Bruce , E. Vesperini , A. Askar , E. Bortolan , M. Giersz , J. Hong , A. Hypki , A. P. Milone

We explore the evolution of various properties of multiple-population globular clusters (GCs) for a broad range of initial conditions. We simulated over 200 GC models using the MOCCA Monte Carlo code and find that present-day properties…

We present the first population synthesis of synchronous magnetic cataclysmic variables, called polars, taking into account the effect of the white dwarf (WD) magnetic field on angular momentum loss. We implemented the reduced magnetic…

Solar and Stellar Astrophysics · Physics 2019-12-25 Diogo Belloni , Matthias R. Schreiber , Anna F. Pala , Boris T. Gänsicke , Mónica Zorotovic , Claudia V. Rodrigues

We compare the X-ray spectra and luminosities, in the 2-8 keV band, of known and suspected cataclysmic variables (CVs) in different environments, assessing the nature of these source populations. These objects include nearby CVs observed…

Astrophysics · Physics 2009-06-23 Craig O. Heinke , Ashley J. Ruiter , Michael P. Muno , Krzysztof Belczynski

A central hypothesis in the theory of cataclysmic variable (CV) evolution is the need to explain the observed lack of accreting systems in the ~2-3 h orbital period range, known as the period gap. The standard model, disrupted magnetic…

We discuss a new scenario for the formation of intermediate mass black holes in dense star clusters. In this scenario, intermediate mass black holes are formed as a result of dynamical interactions of hard binaries containing a stellar mass…

Astrophysics of Galaxies · Physics 2016-08-05 M. Giersz , N. Leigh , A. Hypki , N. Lützgendorf , A. Askar

Highly sensitive and precise X-ray imaging from Chandra, combined with the superb spatial resolution of HST optical images, dramatically enhances our empirical understanding of compact binaries such as cataclysmic variables and low mass…

Solar and Stellar Astrophysics · Physics 2015-05-20 Bruce Margon , B. Beck-Winchatz , L. Homer , D. Pooley , C. G. Bassa , S. F. Anderson , W. H. G. Lewin , F. Verbunt , A. K. H. Kong , R. M. Plotkin

We estimate the population of eccentric gravitational wave (GW) binary black hole (BBH) mergers forming during binary-single interactions in globular clusters (GCs), using ~ 800 GC models that were evolved using the MOCCA code for star…

High Energy Astrophysical Phenomena · Physics 2018-03-28 Johan Samsing , Abbas Askar , Mirek Giersz

We give an updated version of the analytical equation of state used in the Cambridge stellar evolution code (STARS) as a free to use open-source package that we have used to model cool white dwarfs down to temperatures…

Solar and Stellar Astrophysics · Physics 2022-04-29 Arnab Sarkar , Christopher A. Tout

The formation of cataclysmic variables (CVs) has long been modeled as a product of common envelope evolution (CEE) in isolated binaries. However, a significant fraction of intermediate-mass stars -- the progenitors of the white dwarfs (WDs)…

Solar and Stellar Astrophysics · Physics 2025-07-14 Cheyanne Shariat , Kareem El-Badry , Smadar Naoz , Antonio C. Rodriguez , Jan van Roestel

Using the MOCCA code, we study the evolution of globular clusters (GCs) with multiple stellar populations. For this purpose, the MOCCA code has been significantly extended to take into account the formation of an enriched population of…

Astrophysics of Galaxies · Physics 2025-07-02 Mirek Giersz , Abbas Askar , Arkadiusz Hypki , Jongsuk Hong , Grzegorz Wiktorowicz , Lucas Hellstrom

In this first of a series of papers, we utilize results for around two thousand star cluster models simulated using the MOCCA code for star cluster evolution (Survey Database I) to determine the astrophysical properties and local merger…

High Energy Astrophysical Phenomena · Physics 2016-10-10 Abbas Askar , Magdalena Szkudlarek , Dorota Gondek-Rosińska , Mirek Giersz , Tomasz Bulik

Cataclysmic variables (CVs) are compact binary systems in which a white dwarf accretes matter from a Roche-lobe-filling companion star. In this study, we searched for new CVs in the Milky Way in the Chandra Source Catalog v2.0,…