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Globular Cluster Scale Sizes in Giant Galaxies: The Case of M87 and the Role of Orbital Anisotropy and Tidal Filling
Jeremy J. Webb, Alison Sills, William E. Harris
We present new Hubble Space Telescope imaging of the outer regions of M87 in order to study its globular cluster (GC) population out to large galactocentric distances. We discuss p…
Double Blue Straggler sequences in GCs: the case of NGC 362
E. Dalessandro, F. R. Ferraro, D. Massari +8
We used high-quality images acquired with the WFC3 on board the HST to probe the blue straggler star (BSS) population of the Galactic globular cluster NGC 362. We have found two di…
Overview of the Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX) Project
Eric D. Feigelson, Leisa K. Townsley, Patrick S. Broos +16
MYStIX (Massive Young Star-Forming Complex Study in Infrared and Xray) seeks to characterize 20 OB-dominated young clusters and their environs at distances d < 4 kpc using imaging…
The state of globular clusters at birth: emergence from the gas-embedded phase
Nathan W. C. Leigh, Mirek Giersz, Jeremy J. Webb +4
In this paper, we discuss the origin of the observed correlation between cluster concentration c and present-day mass function (PDMF) slope α reported by De Marchi, Paresce & Pulon…
The radius discrepancy in low mass stars: single vs. binaries
F. Spada, P. Demarque, Y. -C. Kim +1
A long-standing issue in the theory of low mass stars is the discrepancy between predicted and observed radii and effective temperatures. In spite of the increasing availability of…
Modifying two-body relaxation in N-body systems by gas accretion
Nathan W. C. Leigh, Alison Sills, Torsten Boker
We consider the effects that accretion from the interstellar medium onto the particles of an N-body system has on the rate of two-body relaxation. To this end, we derive an accreti…
Mock Observations of Blue Stragglers in Globular Cluster Models
Alison Sills, Evert Glebbeek, Sourav Chatterjee +1
We created artificial color-magnitude diagrams of Monte Carlo dynamical models of globular clusters, and then used observational methods to determine the number of blue stragglers…
Stellar Collisions and Blue Straggler Stars in Dense Globular Clusters
Sourav Chatterjee, Frederic A. Rasio, Alison Sills +1
Blue straggler stars (BSS) are abundantly observed in all Galactic globular clusters (GGC) where data exist. However, observations alone cannot reveal the relative importance of va…
The Influence of Orbital Eccentricity on Tidal Radii of Star Clusters
Jeremy J. Webb, William E. Harris, Alison Sills +1
We have performed N-body simulations of star clusters orbiting in a spherically symmetric smooth galactic potential. The model clusters cover a range of initial half-mass radii and…