Stellar collisions during binary-binary and binary-single star interactions

Fregeau, John M.; Cheung, P.; Zwart, Simon F. Portegies; Rasio, Frederic A.

doi:10.1111/j.1365-2966.2004.07914.x

Cited by 340 publications

(487 citation statements)

References 88 publications

(152 reference statements)

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“…For our simulations we have used the MOnte-Carlo Cluster simulAtor (MOCCA) code developed by Giersz et al (2008) with an implementation of the FEWBODY interaction scheme (Fregeau et al 2004) by . 10%, 20%, 50% N = Ns + N b is the sum of the number of single, Ns, and binary, N b , particles.…”

Section: Methods and Initial Conditionsmentioning

confidence: 99%

Dynamical formation of cataclysmic variables in globular clusters

Vesperini

Belloni

Giersz

2016

Mon. Not. R. Astron. Soc.

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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 correlation between the number of X-ray sources and the stellar encounter rate and provided evidence of the role of dynamics in the formation of X-ray binaries. We have performed a survey of Monte-Carlo simulations aimed at exploring the connection between the dynamics and formation of cataclysmic variables (CVs) and the origin of the observed correlation between the number of these objects, N cv , and the stellar encounter rate, Γ. The results of our simulations show a correlation between N cv and Γ as found in observational data, illustrate the essential role played by dynamics, and shed light on the dynamical history behind this correlation. CVs in our simulations are more centrally concentrated than single stars with masses close to those of turn-off stars, although this trend is stronger for CVs formed from primordial binaries undergoing exchange encounters, which include a population of more massive CVs absent in the group of CVs formed from binaries not suffering any component exchange.

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Section: Methods and Initial Conditionsmentioning

confidence: 99%

Dynamical formation of cataclysmic variables in globular clusters

Vesperini

Belloni

Giersz

2016

Mon. Not. R. Astron. Soc.

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“…In addition to the features of the old version, it incorporates the direct Fewbody integrator (Fregeau et al 2004) for three and four-body interactions and a new treatment of the escape process based on Fukushige & Heggie (2000). With the addition of the Fewbody integrator the code can follow all interaction channels that are important for the rate of creation of various types of objects and binaries observed in star clusters, and it ensures that energy generation by binaries nearly matches that in an N-body model.…”

Section: Dynamical Modellingmentioning

confidence: 99%

The M 4 Core Project with HST: I. Overview and first epoch

et al. 2013

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We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M 4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive companions (black holes, neutron stars, or white dwarfs) by measuring the "wobble" of the luminous (mainsequence) companion around the center of mass of the pair, with an astrometric precision of ∼ 50 μas. The high spatial resolution and stable medium-band PSFs of WFC3/UVIS will make these measurements possible. In this work we describe (i) the motivation behind this study, (ii) our observing strategy, (iii) the many other investigations enabled by this unique data set, and which of those our team is conducting, and (iv) a preliminary reduction of the first-epoch dataset collected on

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“…All dynamical binary interactions (binary-binary and binarysingle) are directly numerically integrated with Fewbody, an efficient computational toolkit for evolving small-N dynamical systems (Fregeau et al 2004). Fewbody was designed specifically for performing dynamical scattering interactions, and thus, it is well suited for our purposes.…”

Section: Binary Interactionsmentioning

confidence: 99%

Monte Carlo Simulations of Globular Cluster Evolution. IV. Direct Integration of Strong Interactions

Fregeau

Rasio

2007

ApJ

158

189

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We study the dynamical evolution of globular clusters containing populations of primordial binaries, using our newly updated Monte Carlo cluster evolution code with the inclusion of direct integration of binary scattering interactions. We describe the modifications we have made to the code, as well as improvements we have made to the core Monte Carlo method. We present several test calculations to verify the validity of the new code and perform many comparisons with previous analytical and numerical work in the literature. We simulate the evolution of a large grid of models, with a wide range of initial cluster profiles and with binary fractions ranging from 0 to 1, and compare with observations of Galactic globular clusters. We find that our code yields very good agreement with direct N-body simulations of clusters with primordial binaries, but yields some results that differ significantly from other approximate methods. Notably, the direct integration of binary interactions reduces their energy generation rate relative to the simple recipes used in Paper III and yields smaller core radii. Our results for the structural parameters of clusters during the binary-burning phase are now in the tail of the range of parameters for observed clusters, implying that either clusters are born significantly more or less centrally concentrated than has been previously considered or there are additional physical processes beyond two-body relaxation and binary interactions that affect the structural characteristics of clusters.

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Stellar collisions during binary-binary and binary-single star interactions

Cited by 340 publications

References 88 publications

Dynamical formation of cataclysmic variables in globular clusters

Dynamical formation of cataclysmic variables in globular clusters

The M 4 Core Project with HST: I. Overview and first epoch

Monte Carlo Simulations of Globular Cluster Evolution. IV. Direct Integration of Strong Interactions

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