Based on recent findings of a formation mechanism of substructure in tidal tails by Küpper, Macleod & Heggie (2008) we investigate a more comprehensive set of N -body models of star clusters on orbits about a Milky-Way-like potential. We find that the predicted epicyclic overdensities arise in any tidal tail no matter which orbit the cluster follows as long as the cluster lives long enough for ...

We construct a simple symplectic map to study the dynamics of eccentric orbits in non-spherical potentials. The map offers a dramatic improvement in speed over traditional integration methods, while accurately representing the qualitative details of the dynamics. We focus attention on planar, non-axisymmetric power-law potentials, in particular the logarithmic potential. We confirm the presence...

The observed extrasolar planets possess both large masses (with a median M sin i of 1.65 MJ) and a wide range in orbital eccentricity (0 < e < 0.94). As planets are thought to form in circumstellar disks, one important question in planet formation is determining whether, and to what degree, a gaseous disk affects an eccentric planet’s orbit. Recent studies have probed the interaction between a ...

I propose that the relatively high eccentricity 0.1 ∼< e ∼< 0.4 found in some tidally strongly interacting binary systems, where the mass-losing star is an evolved giant star, e.g., an asymptotic giant branch star, is caused by an enhanced mass loss rate during periastron passages. Tidal interaction by itself will circularize the orbits of these systems in a relatively short time, hence a mecha...

We investigate the timelike geodesics and periapsis precession of orbits in Fisher-Janis-Newman-Winicour-Wyman spacetime. This spacetime represents naked singularity Einstein-massless scalar system. revisit results previous studies relax assumptions about eccentricity a bound orbit size semilatus. find that negative occurs when sufficiently deviates from Schwarzschild In particular, for small e...

We investigate the suggestion that the frequencies of the kilohertz and other QPOs in the emission from neutron stars in low-mass X-ray binaries are generated by geodesic motion of gas clumps around the star. First we assume, following previous work, that the dominant frequencies produced by such motions are the azimuthal frequency ν K , the apsidal precession frequency ν AP , and the first ove...

We study the tidal evolution of a binary system consisting of a 1.4M⊙ compact object in elliptic orbit about a 10M⊙ uniformly rotating main sequence (MS) star for various values of the initial orbital parameters. We apply our previously published results of 2D non-adiabatic calculations of the non-radial gand r-mode oscillations of the uniformly rotating MS star, and include the effects of reso...

Stochastic gravitational wave background produced by a stationary coalescing population of binary neutron stars in the Galaxy is calculated. This background is found to constitute a confusion limit within the LISA frequency band up to a limiting frequency νlim ∼ 10 −3 Hz, leaving the frequency window ∼ 10–10 Hz open for the potential detection of cosmological stochastic gravitational waves and ...

Formation  ying is a key technology for both deep-space and orbital applications that involve multiple spacecraft. Many future space applications will beneŽ t from using formation  ying technologies to perform distributed observations (e.g., synthetic apertures for Earth mapping interferometry) and to provide improved coverage for communication and surveillance. Previous research has focused ...

The capture and subsequent inspiral of stellar mass black holes on eccentric orbits by central massive black holes, is one of the more interesting likely sources of gravitational radiation detectable by LISA. We estimate the rate of observable events and the associated uncertainties. A moderately favourable mass function could provide many detectable bursts each year, and a detection of at leas...