Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

The Search for Multiple Populations in Magellanic Cloud Clusters III: No evidence for Multiple Populations in the SMC cluster NGC 419

Martocchia, S and Bastian, N and Usher, CG and Kozhurina-Platais, V and Niederhofer, F and Cabrera-Ziri, I and Dalessandro, E and Hollyhead, K and Kacharov, N and Lardo, C and Larsen, S and Mucciarelli, A and Platais, I and Salaris, M and Cordero, M and Geisler, D and Hilker, M and Li, C and Mackey, D (2017) The Search for Multiple Populations in Magellanic Cloud Clusters III: No evidence for Multiple Populations in the SMC cluster NGC 419. Monthly Notices of the Royal Astronomical Society, 468 (3). pp. 3150-3158. ISSN 0035-8711

[img] Text
1703.04631v1.pdf - Accepted Version

Download (1MB)

Abstract

We present the third paper about our ongoing HST survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, a $\sim 1.5$ Gyr old, massive ($\gtrsim 2 \times 10^5 \, {\rm M_{\odot}}$) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data with stellar isochrones, we set a limit on [N/Fe] enhancement of $\lesssim$+0.5 dex and hence we find that no MPs are detected in this cluster. This is surprising because, in the first two papers of this series, we found evidence for MPs in 4 other SMC clusters (NGC 121; Lindsay 1, NGC 339, NGC 416), aged from 6 Gyr up to $\sim 10-11$ Gyr. This finding raises the question whether age could play a major role in the MPs phenomenon. Additionally, our results appear to exclude mass or environment as the only key factors regulating the existence of a chemical enrichment, since all clusters studied so far in this survey are equally massive ($\sim 1-2 \times 10^5 \, {\rm M_{\odot}}$) and no particular patterns are found when looking at their spatial distribution in the SMC.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.CO; astro-ph.SR
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 16 Mar 2017 12:39
Last Modified: 27 Apr 2017 10:57
DOI or Identification number: 10.1093/mnras/stx660
URI: http://researchonline.ljmu.ac.uk/id/eprint/6029

Actions (login required)

View Item View Item