Relative Frequencies of Blue Stragglers in Galactic Globular Clusters: Constraints for the Formation Mechanisms

Abstract

We discuss the main properties of the Galactic globular cluster (GC) blue straggler stars (BSS), as inferred from our new catalog containing nearly 3000 BSS. The catalog has been extracted from the photometrically homogeneous V vs. (B-V) color-magnitude diagrams (CMD) of 56 GCs, based on WFPC2 images of their central cores. In our analysis we used consistent relative distances based on the same photometry and calibration. The number of BSS has been normalized to obtain relative frequencies (F_{BSS}) and specific densities (N_S) using different stellar populations extracted from the CMD. The cluster F_{BSS} is significantly smaller than the relative frequency of field BSS. We find a significant anti-correlation between the BSS relative frequency in a cluster and its total absolute luminosity (mass). There is no statistically significant trend between the BSS frequency and the expected collision rate. F_{BSS} does not depend on other cluster parameters, apart from a mild dependence on the central density. PCC clusters act like normal clusters as far as the BSS frequency is concerned. We also show that the BSS luminosity function for the most luminous clusters is significantly different, with a brighter peak and extending to brighter luminosities than in the less luminous clusters. These results imply that the efficiency of BSS production mechanisms and their relative importance vary with the cluster mass.

arXiv comment12 pages, 3 figures. accepted for publication in ApJL

References in corpus (6)

• Internal Dynamics of Globular Clusters
• The Charge Transfer Efficiency and Calibration of WFPC2
• HST color-magnitude diagrams of 74 galactic globular clusters in the HST F439W and F555W bands
• Blue Straggler Stars: a direct comparison of Star counts and population ratios in six Galactic Globular Clusters
• On the helium content of Galactic globular clusters via the R parameter
• High-resolution simulations of stellar collisions between equal-mass main-sequence stars in globular clusters

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