Evolutionary history of four binary blue stragglers from the globular clusters ωCen, M55, 47 Tuc and NGC 6752

Abstract

Context. Origin and evolution of blue stragglers in globular clusters is still a matter of debate. Aims. The aim of the present investigation is to reproduce the evolutionary history of four binary blue stragglers in four different clusters, for which precise values of global parameters are known. Methods. Using the model for cool close binary evolution, developed by one of us (KS), progenitors of all investigated binaries were found and their parameters evolved into the presently observed values. Results. The results show that the progenitors of the binary blue stragglers are cool close binaries with period of a few days, which transform into stragglers by rejuvenation of the initially less massive component by mass transfer from its more massive companion overflowing the inner critical Roche surface. The parameters of V209 from ωCen indicate that the binary is substantially enriched in helium. This is an independent and strong evidence for the existence of the helium rich subpopulation in this cluster.

Accepted by Astronomy and Astrophysics

References in corpus (17)

• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
• Mergers and Obliquities in Stellar Triples
• Dynamical age differences among coeval star clusters as revealed by blue stragglers
• The Stagger-grid: A grid of 3D stellar atmosphere models - III. The relation to mixing-length convection theory
• Confronting uncertainties in stellar physics: calibrating convective overshooting with eclipsing binaries
• The state of globular clusters at birth II: primordial binaries
• Binary coalescence from case A evolution -- mergers and blue stragglers
• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• Medium resolution spectroscopy in Omega Centauri: abundances of 400 subgiant and turn-off region
• Time sequence spectroscopy of AW UMa. The 518 nm Mg I triplet region analyzed with Broadening Functions
• The Clusters AgeS Experiment (CASE). I. V209 omega Cen - An Eclipsing Post-Common Envelope Binary in the Globular Cluster omega Cen
• A model of AW UMa
• Model computations of blue stragglers and W UMa-type stars in globular clusters
• Stellar populations in $\omega$ Centauri: a multivariate analysis
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems
• The Multiple Origin of Blue Straggler Stars: Theory vs. Observations
• Blue Straggler Stars: Early Observations that Failed to Solve the Problem

Cited by in corpus (1)

• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip