scholarly journals Constraints on blue straggler formation mechanisms in galactic globular clusters from proper motion velocity distributions

2018 ◽  
Vol 482 (1) ◽  
pp. 231-239 ◽  
Author(s):  
N W C Leigh ◽  
T Panurach ◽  
M Simunovic ◽  
A M Geller ◽  
D Zurek ◽  
...  
Keyword(s):  
Proper Motion ◽  
Globular Clusters ◽  
Formation Mechanisms ◽  
Motion Velocity ◽  
Blue Straggler ◽  
Galactic Globular Clusters

scholarly journals Characterizing Blue Straggler Star Populations in Globular Clusters using HST Photometric Survey Data

2015 ◽  
Vol 11 (A29B) ◽  
pp. 149-150
Author(s):  
Mirko Simunovic ◽  
Thomas H. Puzia
Keyword(s):  
Detailed Analysis ◽  
Survey Data ◽  
Proper Motion ◽  
Globular Clusters ◽  
Stellar Mass ◽  
Evolutionary Models ◽  
Early Results ◽  
Blue Straggler ◽  
Age Estimates

AbstractWe present early results from a detailed analysis of the BSS population in Galactic GCs based on HST data. Using proper motion cleaning of the color-magnitude diagrams we construct a large catalog of BSSs and study some population properties. Stellar evolutionary models are used to find stellar mass and age estimates for the BSS populations in order to establish constraints related to the dynamical interactions in which they may have formed.

scholarly journals Kinematics of Galactic Globular Clusters from Schmidt-Plate Astrometry

1995 ◽  
Vol 164 ◽  
pp. 405-405 ◽  
Author(s):  
R.-D. Scholz ◽  
S. Hirte ◽  
M.J. Irwin ◽  
M. Odenkirchen
Keyword(s):  
Radial Velocity ◽  
Proper Motion ◽  
Globular Clusters ◽  
Proper Motions ◽  
Large Numbers ◽  
Solar Motion ◽  
The Galaxy ◽  
Ursa Minor ◽  
Galactic Globular Clusters

From measurements of Tautenburg Schmidt plates with the APM facility in Cambridge we obtained absolute proper motions of the Galactic globular clusters M 3 and M 92 directly with respect to large numbers of background galaxies (Scholz et al. 1993, 1994). We have extended our work to the dSphs in Draco and Ursa Minor (Scholz & Irwin 1994) and to other Galactic globular clusters using Tautenburg, Palomar and UK Schmidt plates. Combining our absolute proper motion of a cluster with its known radial velocity and distance (using common parameters of the solar motion) we derive the cluster orbit in the Galaxy (cf. Odenkirchen & Brosche 1992).

scholarly journals Blue Straggler Stars: A Direct Comparison of Star Counts and Population Ratios in Six Galactic Globular Clusters

2003 ◽  
Vol 588 (1) ◽  
pp. 464-477 ◽  
Author(s):  
Francesco R. Ferraro ◽  
Alison Sills ◽  
Robert T. Rood ◽  
Barbara Paltrinieri ◽  
Roberto Buonanno
Keyword(s):  
Globular Clusters ◽  
Blue Straggler ◽  
Galactic Globular Clusters

scholarly journals Observations of blue straggler stars in globular clusters

2006 ◽  
Vol 2 (14) ◽  
pp. 438-439
Author(s):  
Francesco R. Ferraro ◽  
Barbara Lanzoni
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Stellar Population ◽  
Main Sequence ◽  
Formation Mechanisms ◽  
Main Sequence Stars ◽  
Blue Stragglers ◽  
Photometric And Spectroscopic Observations ◽  
Blue Straggler ◽  
Dynamical Simulations

AbstractBlue stragglers stars (BSS) define a sparsely populated sequence extending to higher luminosity than the turnoff point of normal main sequence stars in the color magnitude diagrams of stellar aggregates, thus mimicking a rejuvenated (more massive) stellar population. The nature of these stars has been a puzzle for many years and their formation mechanism is not completely understood, yet. Two mechanisms have been proposed to produce BSS: (i) the mass transfer in binary systems; and ((ii) the merger of two stars induced by stellar interactions. In this contribution we schematically report on the main properties of BSS in globular clusters (GCs) in the light of the most recent photometric and spectroscopic observations. These results, combined with dynamical simulations, indicate that both the proposed formation mechanisms play an important role in the production of BSS in GCs.

scholarly journals The correlation between blue straggler and binary fractions in the core of Galactic globular clusters

2008 ◽  
Vol 481 (3) ◽  
pp. 701-704 ◽  
Author(s):  
A. Sollima ◽  
B. Lanzoni ◽  
G. Beccari ◽  
F. R. Ferraro ◽  
F. Fusi Pecci
Keyword(s):  
Globular Clusters ◽  
The Core ◽  
Blue Straggler ◽  
Galactic Globular Clusters

scholarly journals Absolute Proper Motion of Galactic Globular Clusters

1993 ◽  
Vol 156 ◽  
pp. 249-254
Author(s):  
R.-D. Scholz ◽  
M. J. Irwin
Keyword(s):  
Reference Frame ◽  
Proper Motion ◽  
Globular Clusters ◽  
Stepwise Regression ◽  
Regression Method ◽  
Systematic Effects ◽  
The Mean ◽  
Galactic Globular Clusters

Using automated scans of Tautenburg Schmidt plates with the APM facility in Cambridge (UK) the mean tangential motion of two globular clusters, M3 and M92, is determined directly with respect to a well defined extragalactic reference frame. In both fields five pairs of plates centred on the cluster with epoch differences from 20 to 27 years were measured. In the independent proper motion determination with 1200 to 2300 reference galaxies for each pair of plates we used 3rd order polynomials and a stepwise regression method. The mean absolute cluster p.m. corrected for systematic effects dependent on the coordinates was obtained with an accuracy of ±0.03 arcsec/century for M3 and ±0.06 arcsec/century for M92.

scholarly journals Observations and Simulations of the Blue Straggler Star Radial Distribution: Clues on the Formation Mechanisms

2007 ◽  
Vol 3 (S246) ◽  
pp. 326-330
Author(s):  
Barbara Lanzoni
Keyword(s):  
Mass Transfer ◽  
Monte Carlo ◽  
Radial Distribution ◽  
Globular Clusters ◽  
Formation Mechanisms ◽  
Wide Field ◽  
Field Observations ◽  
Blue Stragglers ◽  
Blue Straggler ◽  
Dynamical Simulations

AbstractBy means of high-resolution and wide-field observations in the UV and optical bands we have derived the radial distribution of the Blue Stragglers Star (BSS) population in a number of galactic globular clusters. Monte-Carlo dynamical simulations have then been used to interpret the observed radial distributions in terms of percentage of collisional and mass-transfer BSS populating each cluster. I will present the main results thus obtained and an overall cluster–to–cluster comparison for the whole sample collected so far, mainly focusing on the clues that such an approach provides about the BSS formation mechanisms.

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