J/AJ/136/1039: Resource Record Summary

Resource Record Summary

Catalog Service:
CaII index of SMC red giant branch stars

Short name: J/AJ/136/1039 IVOA Identifier: ivo://CDS.VizieR/J/AJ/136/1039 DOI (Digital Object Identifier): 10.26093/cds/vizier.51361039 Publisher: CDS[+]ivo://CDS[Pub. ID] More Info: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/136/1039 VO Compliance: Level 2: This is a VO-compliant resource.	Status: active Registered: 2011 May 19 08:19:33Z
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Description

We present stellar metallicities derived from Ca II triplet spectroscopy in over 350 red giant branch stars in 13 fields distributed in different positions in the Small Magellanic Cloud, ranging from ~1{deg} to ~4{deg} from its center. In the innermost fields, the average metallicity is [Fe/H]~-1. This value decreases when we move away toward outermost regions. This is the first detection of a spectroscopic metallicity gradient in this galaxy. We show that the metallicity gradient is related to an age gradient, in the sense that more metal-rich stars, which are also younger, are concentrated in the central regions of the galaxy.

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