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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28113
Title: LBT/MODS spectroscopy of globular clusters in the irregular galaxy NGC 4449
Authors: ANNIBALI, FRANCESCA 
Morandi, E.
Watkins, L. L.
TOSI, Monica 
Aloisi, A.
BUZZONI, Alberto 
CUSANO, FELICE 
FUMANA, Marco 
Marchetti, A.
MIGNOLI, Marco 
Mucciarelli, A.
ROMANO, Donatella 
van der Marel, R. P.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 476
Issue: 2
First Page: 1942
Abstract: We present intermediate-resolution (R ∼ 1000) spectra in the ∼3500-10 000 Å range of 14 globular clusters in the Magellanic irregular galaxy NGC 4449 acquired with the Multi-Object Double Spectrograph on the Large Binocular Telescope. We derived Lick indices in the optical and the Ca II triplet index in the near-infrared in order to infer the clusters' stellar population properties. The inferred cluster ages are typically older than ∼9 Gyr, although ages are derived with large uncertainties. The clusters exhibit intermediate metallicities, in the range -1.2 ≲ [Fe/H] ≲ -0.7, and typically sub-solar [α/Fe] ratios, with a peak at ∼-0.4. These properties suggest that (i) during the first few Gyr NGC 4449 formed stars slowly and inefficiently, with galactic winds having possibly contributed to the expulsion of the α-elements, and (ii) globular clusters in NGC 4449 formed relatively `late', from a medium already enriched in the products of Type Ia supernovae. The majority of clusters appear also underabundant in CN compared to Milky Way halo globular clusters, perhaps because of the lack of a conspicuous N-enriched, second generation of stars like that observed in Galactic globular clusters. Using the cluster velocities, we infer the dynamical mass of NGC 4449 inside 2.88 kpc to be M(<2.88 kpc) = 3.15^{+3.16}_{-0.75} × 10^9 M_{\odot }. We also report the serendipitous discovery of a planetary nebula within one of the targeted clusters, a rather rare event.
URI: http://hdl.handle.net/20.500.12386/28113
URL: https://academic.oup.com/mnras/article/476/2/1942/4848306
ISSN: 0035-8711
DOI: 10.1093/mnras/sty344
Bibcode ADS: 2018MNRAS.476.1942A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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