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Chemical abundances in the multiple sub-giant branch of 47 Tucanae: insights on its faint sub-giant branch component

Marino, A. F.; Milone, A. P.; Casagrande, L.; Collet, R.; Dotter, A.; Johnson, C. I.; Lind, K.; Bedin, L. R.; Jerjen, H.; Aparicio, A.; Sbordone, L.

Description

The globular cluster 47 Tuc exhibits a complex sub-giant branch (SGB) with a faint-SGB comprising only about the 10 per cent of the cluster mass and a bright-SGB hosting at least two distinct populations. We present a spectroscopic analysis of 62 SGB stars including 21 faint-SGB stars. We thus provide the first chemical analysis of the intriguing faint-SGB population and compare its abundances with those of the dominant populations. We have inferred abundances of Fe, representative light...[Show more]

CollectionsANU Research Publications
Date published: 2016-03-07
Type: Journal article
URI: http://hdl.handle.net/1885/111562
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stw611

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