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|Title:||The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - IV. Helium content and relative age of multiple stellar populations within NGC 6352||Authors:||Nardiello, D.
Milone, A. P.
Marino, A. F.
Marel, R. P. van der
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||451||Issue:||1||First Page:||312||Abstract:||In this paper, we combine Wide Field Camera3/UVIS F275W, F336W, and F438W data from the `UV Legacy Survey of Galactic Globular Clusters: Shedding Light on Their Populations and Formation' (GO 13297) Hubble Space Telescope Treasury programme with F606W, F625W, F658N, and F814W Advanced Camera for Surveys archive data for a multiwavelength study of the globular cluster NGC 6352. In the colour-magnitude and two-colour diagrams obtained with appropriate combination of the photometry in the different bands, we separate two distinct stellar populations and trace them from the main sequence to the subgiant, red giant, horizontal and asymptotic giant branches. We infer that the two populations differ in He by ∆Y = 0.029 ± 0.006. With a new method, we also estimate the age difference between the two sequences. Assuming no difference in [Fe/H] and [α/Fe], and the uncertainties on ∆Y, we found a difference in age between the two populations of 10 ± 120 Myr. If we assume [Fe/H] and [α/Fe] differences of 0.02 dex (well within the uncertainties of spectroscopic measurements), the total uncertainty in the relative age rises to ̃300 Myr.||Acknowledgments:||DN is supported by a grant ‘Borsa di studio per l'estero, bando 2013’ awarded by ‘Fondazione Ing. Aldo Gini’ in Padova (Italy). SC, SO, and GP acknowledge partial support by PRIN-INAF 2014. SO and GP acknowledge partial support by Progetto di Ateneo (Università di Padova) 2014. APM acknowledges support by the Australian Research Council through Discovery Early Career Researcher Award DE150101816.||URI:||http://hdl.handle.net/20.500.12386/23794||URL:||https://academic.oup.com/mnras/article/451/1/312/1374288||ISSN:||0035-8711||DOI:||10.1093/mnras/stv971||Bibcode ADS:||2015MNRAS.451..312N||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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