Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

Leveraging HST with MUSE: II. Na-abundance variations in intermediate age star clusters

Martocchia, S, Kamann, S, Saracino, S, Usher, CG, Bastian, N, Rejkuba, M, Latour, M, Lardo, C, Cabrera-Ziri, I, Dreizler, S, Kacharov, N, Kozhurina-Platais, V, Larsen, S, Mancino, S, Platais, I and Salaris, M (2020) Leveraging HST with MUSE: II. Na-abundance variations in intermediate age star clusters. Monthly Notices of the Royal Astronomical Society, 499 (1). pp. 1200-1211. ISSN 0035-8711

Leveraging HST with MUSE II. Na-abundance variations in intermediate age star clusters.pdf - Published Version

Download (7MB) | Preview


Ancient ($>$10 Gyr) globular clusters (GCs) show chemical abundance variations in the form of patterns among certain elements, e.g. N correlates with Na and anti-correlates with O. Recently, N abundance spreads have also been observed in massive star clusters that are significantly younger than old GCs, down to an age of $\sim$2 Gyr. However, so far N has been the only element found to vary in such young objects. We report here the presence of Na abundance variations in the intermediate age massive star clusters NGC 416 ($\sim$6.5 Gyr old) and Lindsay 1 ($\sim$7.5 Gyr old) in the Small Magellanic Cloud, by combining HST and ESO-VLT MUSE observations. Using HST photometry we were able to construct ''chromosome maps'' and separate sub-populations with different N content, in the red giant branch of each cluster. MUSE spectra of individual stars belonging to each population were combined, resulting in high signal-to-noise spectra representative of each population, which were compared to search for mean differences in Na. We find a mean abundance variation of $\Delta$[Na/Fe]$=0.18\pm0.04$ dex for NGC 416 and $\Delta$[Na/Fe]$=0.24\pm0.05$ dex for Lindsay 1. In both clusters we find that the population that is enhanced in N is also enhanced in Na, which is the same pattern to the one observed in ancient GCs. Furthermore, we detect a bimodal distribution of core-helium burning Red Clump (RC) giants in the UV colour magnitude diagram of NGC 416. A comparison of the stacked MUSE spectra of the two RCs shows the same mean Na abundance difference between the two populations. The results reported in this work are a crucial hint that star clusters of a large age range share the same origin: they are the same types of objects, but only separated in age.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 25 Sep 2020 12:07
Last Modified: 04 Sep 2021 06:37
DOI or ID number: 10.1093/mnras/staa2929
URI: https://researchonline.ljmu.ac.uk/id/eprint/13718
View Item View Item