A Spectroscopic Analysis of Blue Stragglers, Horizontal Branch and Turn-Off Stars in Four Globular Clusters

Abstract

We present a spectroscopic analysis of HST/STIS and FOS low- and intermediate-resolution spectroscopy of 55 stars (turn-off stars, horizontal branch stars and blue stragglers) in four globular clusters (47 Tucanae, M3, NGC6752, and NGC6397). Stars were analyzed with non-Local Thermodynamic Equilibrium model atmospheres, and values for their effective temperatures and gravities and some rotation rates were obtained. Using photometric fluxes, we also obtained radii, luminosities and spectroscopic masses.

71 pages, 28 figures. Electronic figures only in the published version

References in corpus (19)

• WFPC2 Stellar Photometry with HSTphot
• Ultraviolet Radiation from Evolved Stellar Populations -- I. Models
• Distances and ages of NGC 6397, NGC 6752 and 47 Tuc
• The Charge Transfer Efficiency and Calibration of WFPC2
• Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms
• Chemical Abundances and Rotation Velocities of Blue Horizontal-Branch Stars in Six Globular Clusters
• The spin of accreting stars: dependence on magnetic coupling to the disc
• Models for Old, Metal-Poor Stars with Enhanced alpha-Element Abundances. III. Isochrones and Isochrone Population Functions
• Striking Photospheric Abundance Anomalies in Blue Horizontal-Branch Stars in Globular Cluster M13
• Blue Stragglers as Stellar Collision Products: the Angular Momentum Question
• Flash Mixing on the White Dwarf Cooling Curve: FUSE Observations of three He-rich sdB Stars
• The small Blue Straggler star population in the dense Galactic Globular Cluster NGC 6752
• High-resolution simulations of stellar collisions between equal-mass main-sequence stars in globular clusters
• Binaries discovered by the SPY project I. HE 1047-0436: a subdwarf B + white dwarf system
• The Formation Rate of Blue Stragglers in 47 Tucanae
• Hot HB stars in globular clusters - Physical parameters and consequences for theory. VI. The second parameter pair M 3 and M 13
• The Evolution of Blue Stragglers Formed Via Stellar Collisions
• First Evidence of Circumstellar Disks around Blue Straggler Stars
• On the evidence for discs around Blue Straggler stars

Cited by in corpus (41)

• HST Proper Motions and Stellar Dynamics in the Core of the Globular Cluster 47 Tucanae
• Discovery of Carbon/Oxygen depleted Blue Straggler Stars in 47 Tucanae: the chemical signature of a mass-transfer formation process
• A stellar-mass black hole population in the globular cluster NGC 6101?
• Violent Stellar Merger Model for Transient Events
• A Panchromatic Study of the Globular Cluster NGC 1904. I: The Blue Straggler Population
• Blue Straggler masses from pulsation properties. I. The case of NGC6541
• Stellar Exotica in 47 Tucanae
• Chemical and kinematical properties of BSSs and HB stars in NGC 6397
• Helium-Core White Dwarfs in the Globular Cluster NGC 6397
• On the minimum mass ratio of W UMa binaries
• Binary coalescence from case A evolution -- mergers and blue stragglers
• Fast rotating Blue Stragglers in the globular cluster M4
• A kinematic view of NGC 1261: structural parameters, internal dispersion, absolute proper motion and Blue Straggler Stars
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. IV. Kinematic profiles and average masses of blue straggler stars
• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• FLAMES and XSHOOTER spectroscopy along the two BSS sequences of M30
• Accreting White Dwarfs among the Planetary Nebulae Most Luminous in [O III]5007 Emission
• Spectral Energy Distribution of Blue Stragglers in the core of 47 Tucanae
• Spinning like a Blue Straggler: the population of fast rotating Blue Straggler stars in Omega Centauri
• Magnetic Activity in Stellar Merger Products
• Blue straggler masses from pulsation properties. II. Topology of the Instability Strip
• Probing the role of dynamical friction in shaping the BSS radial distribution. I - Semi-analytical models and preliminary N-body simulations
• Formation and Evolution of Blue Stragglers in 47 Tucanae
• Exploring the Mass Segregation Effect of X-ray Sources in Globular Clusters: The Case of 47 Tucanae
• Model computations of blue stragglers and W UMa-type stars in globular clusters
• Another brick in understanding chemical and kinematical properties of BSSs: NGC 6752
• MOCCA code for star cluster simulations - V. Initial globular cluster conditions influence on blue stragglers
• Blue Stragglers and Friends: Initial Evolutionary Pathways in Close Low-Mass Binaries: Literature Review
• A Blue Straggler Binary System with at least Three Progenitors in the Core of a Globular Cluster?
• Tracing the Dynamical History of the Globular Cluster 47 Tucanae
• The MODEST questions: challenges and future directions in stellar cluster research
• SHOTGLAS II. MUSE spectroscopy of blue horizontal branch stars in the core of $\omega$ Centauri and NGC 6752
• Transits and Lensing by Compact Objects in the Kepler Field: Disrupted Stars Orbiting Blue Stragglers
• A halo blue straggler on a highly eccentric retrograde orbit
• Astrophysics in 2006
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems
• A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752
• Field blue straggler stars: Discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat
• Blue Straggler Bimodality: a Brownian Motion Model
• Rotational velocities of Blue Straggler Stars in the Globular Cluster M55
• Stellar populations of the globular cluster NGC 5053 investigated using AstroSat-Ultra Violet Imaging Telescope