Discovery of Carbon/Oxygen depleted Blue Straggler Stars in 47 Tucanae: the chemical signature of a mass-transfer formation process

Abstract

We use high-resolution spectra obtained with the ESO Very Large Telescope to measure surface abundance patterns of 43 Blue Stragglers stars (BSS) in 47 Tuc. We discovered that a sub-population of BSS shows a significant depletion of Carbon and Oxygen with respect to the dominant population. This evidence would suggest the presence of CNO burning products on the BSS surface coming from a deeply peeled parent star, as expected in the case of mass-transfer process. This is the first detection of a chemical signature clearly pointing to a specific BSS formation process in a globular cluster.

Published on 2006, August 10, in ApJ 647, L53

Cited by in corpus (47)

• What is a globular cluster? An observational perspective
• A Binary Origin for Blue Stragglers in Globular Clusters
• The radial distribution of blue straggler stars and the nature of their progenitors
• Investigating mass segregation process in globular clusters with Blue Straggler Stars: the impact of dark remnants
• Blue Straggler Stars in the Unusual Globular Cluster NGC 6388
• Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
• A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue Straggler Population
• The Blue Straggler Population of the Globular Cluster M5
• A Correlation between Blue Straggler and Binary Fractions in the core of Galactic Globular Clusters
• Constraining cosmic scatter in the Galactic halo through a differential analysis of metal-poor stars
• The surprising external upturn of the Blue Straggler radial distribution in M55
• Discovery of Extended Main Sequence Turn-offs in Four Young Massive Clusters in the Magellanic Clouds
• Blue Straggler Populations of Seven Open Clusters with Gaia DR2
• A kinematic view of NGC 1261: structural parameters, internal dispersion, absolute proper motion and Blue Straggler Stars
• The "dynamical clock": dating the internal dynamical evolution of star clusters with Blue Straggler Stars
• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• Fast rotating Blue Stragglers prefer loose clusters
• The helium abundance in the metal-poor globular clusters M30 and NGC6397
• The binary mass transfer origin of the red blue straggler sequence in M30
• Star density profiles of six old star clusters in the Large Magellanic Cloud
• A population of binaries in the Asymptotic Giant Branch of 47 Tucanae?
• Discovery of a double Blue Straggler sequence in M15: new insight into the core-collapse process
• Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
• Dynamical friction in multi-component evolving globular clusters
• Spectral Energy Distribution of Blue Stragglers in the core of 47 Tucanae
• Metal-Rich SX Phe stars in the Kepler Field
• UOCS-VIII. UV Study of the open cluster NGC 2506 using ASTROSAT
• Spinning like a Blue Straggler: the population of fast rotating Blue Straggler stars in Omega Centauri
• Probing the role of dynamical friction in shaping the BSS radial distribution. I - Semi-analytical models and preliminary N-body simulations
• The Blue Straggler population in the globular cluster M53 (NGC5024): a combined HST, LBT, CFHT study
• Empirical measurement of the dynamical ages of three globular clusters and some considerations on the use of the dynamical clock
• Contribution of primordial binary evolution to the two blue-straggler sequences in globular cluster M30
• Model computations of blue stragglers and W UMa-type stars in globular clusters
• Blue Stragglers and Friends: Initial Evolutionary Pathways in Close Low-Mass Binaries: Literature Review
• Discovery of double BSS sequences in the old Galactic open cluster Berkeley 17
• Spectroscopic and asteroseismic analysis of the remarkable main-sequence A star KIC 11145123
• M67 Blue Stragglers with High-resolution Infrared Spectroscopy
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems
• Searching for new observational signatures of the dynamical evolution of star clusters
• Rotational velocities of Blue Straggler Stars in the Globular Cluster M55
• Blue Stragglers in Globular Clusters: Observations, Statistics and Physics
• Structure and evolution of a tidally heated star
• Detection of a white dwarf orbiting a Carbon-Oxygen depleted blue straggler in 47 Tucanae
• The Solar Neighborhood LII: M Dwarf Twin Binaries -- Presumed Identical Twins Appear Fraternal in Variability, Rotation, H$\alpha$, and X-rays
• Unveiling Bifurcated Blue Straggler Sequences in NGC 2173: Insights from Binary Evolution
• Beryllium: The smoking gun of a rejuvenated star
• Fast Rotating Blue Straggler Stars in the globular cluster NGC 1851