The globular cluster NGC 1978 in the Large Magellanic Cloud

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dc.creatorMucciarelli, Alessio
dc.creatorFerraro, Francesco R.
dc.creatorOriglia, Livia
dc.creatorPecci, Flavio Fusi
dc.date2007-01-23
dc.date.accessioned2026-07-07T11:21:01Z
dc.date.available2026-07-07T11:21:01Z
dc.descriptionWe have used deep high-resolution Hubble Space Telescope ACS observations to image the cluster NGC 1978 in the Large Magellanic Cloud. This high-quality photometric data set allowed us to confirm the high ellipticity (~0.30+-0.02) of this stellar system. The derived Color Magnitude Diagram allowed a detailed study of the main evolutionary sequences: in particular we have detected the so called Bump along the Red Giant Branch (at V_{555}=19.10+-0.10). This is the first detection of this feature in an intermediate-age cluster. Moreover the morphology of the evolutionary sequence and their population ratios have been compared with the expectations of different theoretical models (namely BaSTI, PEL and Padua) in order to quantify the effect of convective overshooting. The best agreement (both in terms of morphology and star counts) has been found the PEL (Pisa Evolutionary Library) isochrone with Z=0.008 (consistenly with the most recent determination of the cluster metallicity, [M/H]=-0.37 dex) and a mild overshooting efficiency (Lambda_{os}=0.1). By adopting this theoretical set an age of 1.9+-0.1 Gyr has been obtained.
dc.description26 pages, 8 figures, accepted to AJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0701649
dc.identifierhttp://arxiv.org/abs/astro-ph/0701649
dc.identifierAstron.J.133:2053-2060,2007
dc.identifierdoi:10.1086/513076
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194141
dc.subjectAstrophysics
dc.titleThe globular cluster NGC 1978 in the Large Magellanic Cloud
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