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The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XII. The RGB bumps of multiple stellar populations

Lagioia, E. P.; Milone, Antonino P.; Marino, Anna Fabiola; Cassisi, S.; Aparicio, A.; Piotto, G.; Anderson, J.; Barbuy, Beatriz; Bedin, L. R.; Bellini, A.; D'Antona, Francesca; Nardiello, D.; Ortolani, Sergio; Pietrinferni, A.; Renzini, Alvio; Salaris, M.; Sarajedini, A.; van der Marel, R. P.; Vesperini, E.

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The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters is providing a major breakthrough in our knowledge of globular clusters (GCs) and their stellar populations. Among the main results, we discovered that all the studied GCs host two main discrete groups consisting of first generation (1G) and second generation (2G) stars. We exploit the multiwavelength photometry from this project to investigate, for the first time, the Red Giant Branch Bump (RGBB) of the two generations...[Show more]

dc.contributor.authorLagioia, E. P.
dc.contributor.authorMilone, Antonino P.
dc.contributor.authorMarino, Anna Fabiola
dc.contributor.authorCassisi, S.
dc.contributor.authorAparicio, A.
dc.contributor.authorPiotto, G.
dc.contributor.authorAnderson, J.
dc.contributor.authorBarbuy, Beatriz
dc.contributor.authorBedin, L. R.
dc.contributor.authorBellini, A.
dc.contributor.authorD'Antona, Francesca
dc.contributor.authorNardiello, D.
dc.contributor.authorOrtolani, Sergio
dc.contributor.authorPietrinferni, A.
dc.contributor.authorRenzini, Alvio
dc.contributor.authorSalaris, M.
dc.contributor.authorSarajedini, A.
dc.contributor.authorvan der Marel, R. P.
dc.contributor.authorVesperini, E.
dc.date.accessioned2021-07-22T02:12:55Z
dc.date.available2021-07-22T02:12:55Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/241048
dc.description.abstractThe Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters is providing a major breakthrough in our knowledge of globular clusters (GCs) and their stellar populations. Among the main results, we discovered that all the studied GCs host two main discrete groups consisting of first generation (1G) and second generation (2G) stars. We exploit the multiwavelength photometry from this project to investigate, for the first time, the Red Giant Branch Bump (RGBB) of the two generations in a large sample of GCs. We identified, with high statistical significance, the RGBB of 1G and 2G stars in 26 GCs and found that their magnitude separation as a function of the filter wavelength follows comparable trends. The comparison of observations to synthetic spectra reveals that the RGBB luminosity depends on the stellar chemical composition and that the 2G RGBB is consistent with stars enhanced in He and N and depleted in C and O with respect to 1G stars. For metal-poor GCs the 1G and 2G RGBB relative luminosity in optical bands mostly depends on helium content, Y. We used the RGBB observations in F606W and F814W bands to infer the relative helium abundance of 1G and 2G stars in 18 GCs, finding an average helium enhancement ΔY = 0.011 ± 0.002 of 2G stars with respect to 1G stars. This is the first determination of the average difference in helium abundance of multiple populations in a large number of clusters and provides a lower limit to the maximum internal variation of helium in GCs.
dc.description.sponsorshipAPM and AFM acknowledge support by the Australian Research Council through Discovery Early Career Researcher Awards DE150101816 and DE160100851. EPL and APM acknowledge support by the project ERC-StG 2016 716082 funded by the European Research Council. SC, FD, GP, and AR acknowledge financial support from PRIN-INAF2014 (PI S. Cassisi).
dc.publisherBlackwell Publishing Ltd
dc.rights© 2018 The Author(s)
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectstars: abundances
dc.subjectstars: evolution
dc.subjectHertzsprung–Russell and colour–magnitude diagrams
dc.subjectstars: luminosity function, mass function
dc.subjectstars: Population II
dc.titleThe Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XII. The RGB bumps of multiple stellar populations
dc.typeJournal article
local.description.notesAdded manually as didn't import from ARIES
local.identifier.citationvolume475
dc.date.issued2018-01-12
local.identifier.ariespublicationa383154xPUB9792
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationLagioia, E. P., Instituto de Astrofısica de Canarias
local.contributor.affiliationMilone, Antonino, College of Science, ANU
local.contributor.affiliationMarino, Anna, College of Science, ANU
local.contributor.affiliationCassisi, S., Osservatorio Astronomico d’Abruzzo
local.contributor.affiliationAparicio, A., Instituto de Astrofìsica de Canarias
local.contributor.affiliationPiotto, G., Università di Padova
local.contributor.affiliationAnderson, J., STScI
local.contributor.affiliationBarbuy, Beatriz, Universidade de Sao Paulo
local.contributor.affiliationBedin, L. R., INAF-Osservatorio Astronomico di Padova
local.contributor.affiliationBellini, A., Space Telescope Science Institute
local.contributor.affiliationD'Antona, Francesca, INAF-Osservatorio Astronomico di Roma
local.contributor.affiliationNardiello, D., Universita di Padova
local.contributor.affiliationOrtolani, Sergio, Universita di Padova
local.contributor.affiliationPietrinferni, A., INAF-Observatorio Astronomico di Collurania
local.contributor.affiliationRenzini, Alvio, INAF-Osservatorio Astronomico di Padova
local.contributor.affiliationSalaris, M., Liverpool John Moores University
local.contributor.affiliationSarajedini, A., University of Florida
local.contributor.affiliationvan der Marel, R. P., Space Telescope Science Institute
local.contributor.affiliationVesperini, E., Drexel University
dc.relationhttp://purl.org/au-research/grants/arc/DE150101816
dc.relationhttp://purl.org/au-research/grants/arc/DE160100851
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage4088
local.bibliographicCitation.lastpage4103
local.identifier.doi10.1093/mnras/sty083
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 22.7.2021)
CollectionsANU Research Publications

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