Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Heggie, D. A."'
Autor:
Nascimbeni, V., Bedin, L. R., Heggie, D. C., Berg, M. van den, Giersz, M., Piotto, G., Brogaard, K., Bellini, A., Milone, A. P., Rich, R. M., Pooley, D., Anderson, J., Ubeda, L., Ortolani, S., Malavolta, L., Cunial, A., Pietrinferni, A.
We present the results of a photometric search for variable stars in the core of the Galactic globular cluster M4. The input data are a large and unprecedented set of deep Hubble Space Telescope WFC3 images (large program GO-12911; 120 orbits allocat
Externí odkaz:
http://arxiv.org/abs/1405.1626
Autor:
Milone, A. P., Marino, A. F., Bedin, L. R., Piotto, G., Cassisi, S., Dieball, A., Anderson, J., Jerjen, H., Asplund, M., Bellini, A., Brogaard, K., Dotter, A., Giersz, M., Heggie, D. C., Knigge, C., Rich, R. M., Berg, M. van den, Buonanno, R.
The M4 Core Project with HST is designed to exploit the Hubble Space Telescope to investigate the central regions of M4, the Globular Cluster closest to the Sun. In this paper we combine optical and near-infrared photometry to study multiple stellar
Externí odkaz:
http://arxiv.org/abs/1401.1091
Autor:
Bedin, L. R., Anderson, J., Heggie, D. C., Piotto, G., Milone, A. P., Giersz, M., Nascimbeni, V., Bellini, A., Rich, R. M., Berg, M. van den, Pooley, D., Brogaard, K., Ortolani, S., Malavolta, L., Ubeda, L., Marino, A. F.
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observations are designed to constrain the number of binaries with massive c
Externí odkaz:
http://arxiv.org/abs/1312.1096
Based on our recent work on tidal tails of star clusters (Kuepper et al. 2009) we investigate star clusters of a few 10^4 Msun by means of velocity dispersion profiles and surface density profiles. We use a comprehensive set of $N$-body computations
Externí odkaz:
http://arxiv.org/abs/1005.4677
Based on recent findings of a formation mechanism of substructure in tidal tails by Kuepper, 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 th
Externí odkaz:
http://arxiv.org/abs/0909.2619
Autor:
Giersz, M., Heggie, D. C.
We describe Monte Carlo models for the dynamical evolution of the nearby globular cluster NGC 6397. The code includes treatments of two-body relaxation, most kinds of three- and four-body interactions involving primordial binaries and those formed dy
Externí odkaz:
http://arxiv.org/abs/0901.1085
Autor:
Urminsky, D. J., Heggie, D. C.
In this study we consider the relationship between the survival time and the Lyapunov time for 3-body systems. It is shown that the Sitnikov problem exhibits a two-part power law relationship as demonstrated previously for the general 3-body problem.
Externí odkaz:
http://arxiv.org/abs/0810.5461
Autor:
Sommariva, V., Piotto, G., Rejkuba, M., Bedin, L. R., Heggie, D. C., Mathieu, R. D., Villanova, S.
We present a large multi-epoch high resolution spectroscopic investigation for the search of binary candidates in the Galactic Globular Cluster (GGC) M4. The aim of our work is the identification of the binary candidates, and the determination of the
Externí odkaz:
http://arxiv.org/abs/0810.1897
Autor:
Heggie, D. C., Giersz, M.
Astronomers have constructed models of globular clusters for over 100 years. These models mainly fall into two categories: (i) static models, such as King's model and its variants, and (ii) evolutionary models. Most attention has been given to static
Externí odkaz:
http://arxiv.org/abs/0711.2620
Though about 80 pulsar binaries have been detected in globular clusters so far, no pulsar has been found in a triple system in which all three objects are of comparable mass. Here we present predictions for the abundance of such triple systems, and f
Externí odkaz:
http://arxiv.org/abs/0705.4223