Near-infrared photometry of globular clusters towards the Galactic bulge: Observations and photometric metallicity indicators

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dc.contributor.authorCohen, R.E.
dc.contributor.authorBidin, C.M.
dc.contributor.authorMauro, F.
dc.contributor.authorBonatto, C.
dc.contributor.authorGeisler, D.
dc.date.accessioned2017-09-14T19:49:49Z
dc.date.available2017-09-14T19:49:49Z
dc.date.issued2016-09
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractWe present wide-field JHKS photometry of 16 Galactic globular clusters located towards the Galactic bulge, calibrated on the Two Micron All-Sky Survey photometric system. Differential reddening corrections and statistical field star decontamination are employed for all of these clusters before fitting fiducial sequences to the cluster red giant branches (RGBs). Observed values and uncertainties are reported for several photometric features, including the magnitude of the RGB bump, tip, the horizontal branch (HB) and the slope of the upper RGB. The latest spectroscopically determined chemical abundances are used to build distance- and reddening-independent relations between observed photometric features and cluster metallicity, optimizing the sample size and metallicity baseline of these relations by supplementing our sample with results from the literature.We find that the magnitude difference between the HB and the RGB bump can be used to predict metallicities, in terms of both iron abundance [Fe/H] and global metallicity [M/H], with a precision of better than 0.1 dex in all three near-IR bandpasses for relatively metal-rich ([M/H] ≳ -1) clusters. Meanwhile, both the slope of the upper RGB and the magnitude difference between the RGB tip and bump are useful metallicity indicators over the entire sampled metallicity range (-2 ≲ [M/H] ≲ 0) with a precision of 0.2 dex or better, despite model predictions that the RGB slope may become unreliable at high (near-solar) metallicities. Our results agree with previous calibrations in light of the relevant uncertainties, and we discuss implications for clusters with controversial metallicities as well as directions for further investigation.es_CL
dc.description.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2435
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Volume 464, Issue 2, 11 January 2017, Pages 1874–1902es_CL
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.otherhttps://doi.org/10.1093/mnras/stw2435
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/4244
dc.language.isoenes_CL
dc.publisherOXFORD UNIV PRESSes_CL
dc.subjectGlobular clusters: generales_CL
dc.subjectInfrared: starses_CL
dc.titleNear-infrared photometry of globular clusters towards the Galactic bulge: Observations and photometric metallicity indicatorses_CL
dc.typeArtículoes_CL
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