Blue straggler star populations in globular clusters – II. Proper-motion cleaned HST catalogues of BSSs in 38 Galactic GCs

We present new blue straggler star (BSS) catalogues in 38 Milky Way globular clusters (GCs) based on multipassband and multi-epoch treasury survey data from the Hubble Space Telescope. We measure precise astrometry and relative proper motions of stars in all target clusters and performed a subsequen...

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Bibliographic Details
Published inMonthly notices of the Royal Astronomical Society Vol. 462; no. 3; p. 3401
Main Authors Simunovic, Mirko, Puzia, Thomas H
Format Journal Article
LanguageEnglish
Published London Oxford University Press 01.11.2016
Subjects
Astrometry
Astronomy
Catalogues
Cleaning
Clusters
Dispersions
Evolution
Globular clusters
Milky Way
Stars
Stars & galaxies
Velocity
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Summary:We present new blue straggler star (BSS) catalogues in 38 Milky Way globular clusters (GCs) based on multipassband and multi-epoch treasury survey data from the Hubble Space Telescope. We measure precise astrometry and relative proper motions of stars in all target clusters and performed a subsequent cluster membership selection. We study the accuracy of our proper-motion measurements using estimates of central velocity dispersions and find very good agreement with previous studies in the literature. Finally, we present a homogeneous BSS selection method, that expands the classic BSS selection parameter space to more evolved BSS evolutionary stages. We apply this method to the proper-motion cleaned GC star catalogues in order to define proper-motion cleaned BSS catalogues in all 38 GCs, which we make publicly available to enable further study and follow-up observations.
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ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stw1884