The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of Single and Multiple Stellar Populations in Seven Bulge Globular Clusters

In the present work we analyzed seven globular clusters (GCs) selected from their location in the Galactic bulge and with metallicity values in the range −1.30 [Fe/H] −0.50. The aim of this work is first to derive cluster ages assuming single stellar populations and second to identify the stars from...

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Veröffentlicht in:The Astrophysical journal 2020-03, Vol.891 (1), p.37
Hauptverfasser: Oliveira, R. A. P., Souza, S. O., Kerber, L. O., Barbuy, B., Ortolani, S., Piotto, G., Nardiello, D., Pérez-Villegas, A., Maia, F. F. S., Bica, E., Cassisi, S., D'Antona, F., Lagioia, E. P., Libralato, M., Milone, A. P., Anderson, J., Aparicio, A., Bedin, L. R., Brown, T. M., King, I. R., Marino, A. F., Pietrinferni, A., Renzini, A., Sarajedini, A., van der Marel, R., Vesperini, E.
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container_issue 1
container_start_page 37
container_title The Astrophysical journal
container_volume 891
creator Oliveira, R. A. P.
Souza, S. O.
Kerber, L. O.
Barbuy, B.
Ortolani, S.
Piotto, G.
Nardiello, D.
Pérez-Villegas, A.
Maia, F. F. S.
Bica, E.
Cassisi, S.
D'Antona, F.
Lagioia, E. P.
Libralato, M.
Milone, A. P.
Anderson, J.
Aparicio, A.
Bedin, L. R.
Brown, T. M.
King, I. R.
Marino, A. F.
Pietrinferni, A.
Renzini, A.
Sarajedini, A.
van der Marel, R.
Vesperini, E.
description In the present work we analyzed seven globular clusters (GCs) selected from their location in the Galactic bulge and with metallicity values in the range −1.30 [Fe/H] −0.50. The aim of this work is first to derive cluster ages assuming single stellar populations and second to identify the stars from first (1G) and second generations (2G) from the main sequence, subgiant, and red giant branches, and to derive their age differences. Based on a combination of UV and optical filters used in this project, we apply the Gaussian mixture models to distinguish the multiple stellar populations. Applying statistical isochrone fitting, we derive self-consistent ages, distances, metallicities, and reddening values for the sample clusters. An average age of 12.3 0.4 Gyr was obtained both using DSED and BaSTI (accounting atomic diffusion effects) isochrones, without a clear distinction between the moderately metal-poor and the more metal-rich bulge clusters, except for NGC 6717 and the inner halo NGC 6362 with ∼13.5 Gyr. We derived a weighted mean age difference between the multiple populations hosted by each GC of 41 170 Myr adopting canonical He abundances; whereas for higher He in 2G stars, this difference reduces to 17 170 Myr, but with individual uncertainties of 500 Myr.
doi_str_mv 10.3847/1538-4357/ab6f76
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XX. Ages of Single and Multiple Stellar Populations in Seven Bulge Globular Clusters</title><source>Institute of Physics Open Access Journal Titles</source><creator>Oliveira, R. A. P. ; Souza, S. O. ; Kerber, L. O. ; Barbuy, B. ; Ortolani, S. ; Piotto, G. ; Nardiello, D. ; Pérez-Villegas, A. ; Maia, F. F. S. ; Bica, E. ; Cassisi, S. ; D'Antona, F. ; Lagioia, E. P. ; Libralato, M. ; Milone, A. P. ; Anderson, J. ; Aparicio, A. ; Bedin, L. R. ; Brown, T. M. ; King, I. R. ; Marino, A. F. ; Pietrinferni, A. ; Renzini, A. ; Sarajedini, A. ; van der Marel, R. ; Vesperini, E.</creator><creatorcontrib>Oliveira, R. A. P. ; Souza, S. O. ; Kerber, L. O. ; Barbuy, B. ; Ortolani, S. ; Piotto, G. ; Nardiello, D. ; Pérez-Villegas, A. ; Maia, F. F. S. ; Bica, E. ; Cassisi, S. ; D'Antona, F. ; Lagioia, E. P. ; Libralato, M. ; Milone, A. P. ; Anderson, J. ; Aparicio, A. ; Bedin, L. R. ; Brown, T. M. ; King, I. R. ; Marino, A. 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source Institute of Physics Open Access Journal Titles
subjects Astronomical models
Astrophysics
Cluster analysis
Diffusion effects
Galactic bulge
Globular clusters
Globular star clusters
Hubble Space Telescope
Metallicity
Optical filters
Probabilistic models
Red giant stars
Sciences of the Universe
Space telescopes
Stellar age
Stellar populations
title The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of Single and Multiple Stellar Populations in Seven Bulge Globular Clusters
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