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M13 multiple stellar populations seen with the eyes of Stromgren photometry

Savino, A, Massari, D, Bragaglia, A, Dalessandro, E and Tolstoy, E (2017) M13 multiple stellar populations seen with the eyes of Stromgren photometry. Monthly Notices of the Royal Astronomical Society, 474 (4). pp. 4438-4446. ISSN 0035-8711

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Abstract

We present a photometric study of M13 multiple stellar populations over a wide field of view, covering approximately 6.5 half-light radii, using archival Isaac Newton Telescope observations to build an accurate multiband Strömgren catalogue. The use of the Strömgren index cy permits us to separate the multiple populations of M13 on the basis of their position on the red giant branch. The comparison with medium and high resolution spectroscopic analysis confirms the robustness of our selection criterion. To determine the radial distribution of stars in M13, we complemented our data set with Hubble Space Telescope observations of the cluster core, to compensate for the effect of incompleteness affecting the most crowded regions. From the analysis of the radial distributions, we do not find any significant evidence of spatial segregation. Some residuals may be present in the external regions where we observe only a small number of stars. This finding is compatible with the short dynamical time-scale of M13 and represents, to date, one of the few examples of fully spatially mixed multiple populations in a massive globular cluster.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 05 Mar 2018 10:13
Last Modified: 05 Mar 2018 10:13
DOI or Identification number: 10.1093/mnras/stx3093
URI: http://researchonline.ljmu.ac.uk/id/eprint/8176

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