CONSEQUENCES OF DYNAMICAL DISRUPTION AND MASS SEGREGATION FOR THE BINARY FREQUENCIES OF STAR CLUSTERS

@article{Geller2013CONSEQUENCESOD,
  title={CONSEQUENCES OF DYNAMICAL DISRUPTION AND MASS SEGREGATION FOR THE BINARY FREQUENCIES OF STAR CLUSTERS},
  author={Aaron M. Geller and Richard de Grijs and Chengyuan Li and Jarrod Hurley},
  journal={The Astrophysical Journal},
  year={2013},
  volume={779}
}
The massive (13,000–26,000 M☉) and young (15–30 Myr) Large Magellanic Cloud star cluster NGC 1818 reveals an unexpected increasing binary frequency with radius for F-type stars (1.3–2.2 M☉). This is in contrast to many older star clusters that show a decreasing binary frequency with radius. We study this phenomenon with sophisticated N-body modeling, exploring a range of initial conditions, from smooth virialized density distributions to highly substructured and collapsing configurations. We… 

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References

SHOWING 1-10 OF 49 REFERENCES

GRAVITATIONAL CONUNDRUM? DYNAMICAL MASS SEGREGATION VERSUS DISRUPTION OF BINARY STARS IN DENSE STELLAR SYSTEMS

Upon their formation, dynamically cool (collapsing) star clusters will, within only a few million years, achieve stellar mass segregation for stars down to a few solar masses, simply because of

Testing the universality of star formation – I. Multiplicity in nearby star-forming regions

We have collated multiplicity data for five clusters (Taurus, Chamaeleon I, Ophiuchus, IC 348 and the Orion Nebula Cluster). We have applied the same mass ratio (flux ratios of ΔK≤ 2.5) and primary

THE BINARY FRACTION OF THE YOUNG CLUSTER NGC 1818 IN THE LARGE MAGELLANIC CLOUD

We use high-resolution Hubble Space Telescope imaging observations of the young (∼15–25 Myr old) star cluster NGC 1818 in the Large Magellanic Cloud to derive an estimate for the binary fraction of F

The binary fractions in the massive young Large Magellanic Cloud star clusters NGC 1805 and NGC 1818

Using high-resolution data sets obtained with the Hubble Space Telescope, we investigate the radial distributions of the F-type main-sequence binary fractions in the massive young Large Magellanic

Mass segregation in young compact star clusters in the Large Magellanic Cloud — II. Mass functions

We review the complications involved in the conversion of stellar luminosities into masses and apply a range of mass-to-luminosity relations to our Hubble Space Telescope observations of the young

DIRECT N-BODY MODELING OF THE OLD OPEN CLUSTER NGC 188: A DETAILED COMPARISON OF THEORETICAL AND OBSERVED BINARY STAR AND BLUE STRAGGLER POPULATIONS

Following on from a recently completed radial-velocity survey of the old (7 Gyr) open cluster NGC 188 in which we studied in detail the solar-type hard binaries and blue stragglers of the cluster,

WIYN OPEN CLUSTER STUDY. XLVIII. THE HARD-BINARY POPULATION OF NGC 188

We present an in-depth study of the hard-binary population of the old (7 Gyr) open cluster NGC 188. Utilizing 85 spectroscopic binary orbits out of a complete sample of 129 detected binary members,

A Dynamical Origin for Early Mass Segregation in Young Star Clusters

TLDR
It is demonstrated that mergers of small clumps that are initially mass segregated, or in which mass segregation can be produced by two-body relaxation before they merge, generically lead to larger systems that inherit the progenitor clumps' segregation.

Importance of the initial conditions for star formation - III. Statistical properties of embedded protostellar clusters

We investigate the formation of protostellar clusters during the collapse of dense molecular cloud cores with a focus on the evolution of potential and kinetic energy, the degree of substructure and

Modes of Multiple Star Formation

This paper argues that star-forming environments should be classified into finer divisions than the traditional isolated and clustered modes. Using the observed set of Galactic open clusters and