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Searching for globular cluster chemical anomalies on the main sequence of a young massive cluster

Cabrera-Ziri, I, Speagle, JS, Dalessandro, E, Usher, CG, Bastian, N, Salaris, M, Martocchia, S, Kozhurina-Platais, V, Niederhofer, F, Lardo, C, Larsen, SS and Saracino, S (2020) Searching for globular cluster chemical anomalies on the main sequence of a young massive cluster. Monthly Notices of the Royal Astronomical Society, 495 (1). pp. 375-382. ISSN 0035-8711

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Abstract

The spectroscopic and photometric signals of the star-to-star abundance variations found in globular clusters seem to be correlated with global parameters like the cluster’s metallicity, mass, and age. Understanding this behaviour could bring us closer to the origin of these intriguing abundance spreads. In this work we use deep HST photometry to look for evidence of abundance variations in the main sequence of a young massive cluster NGC 419 (∼105 M⊙, ∼1.4 Gyr). Unlike previous studies, here we focus on stars in the same mass range found in old globulars (∼0.75–1 M⊙), where light elements variations are detected. We find no evidence for N abundance variations among these stars in the Un − B and U − B colour–magnitude diagrams of NGC 419. This is at odds with the N variations found in old globulars like 47 Tuc, NGC 6352, and NGC 6637 with similar metallicity to NGC 419. Although the signature of the abundance variations characteristic of old globulars appears to be significantly smaller or absent in this young cluster, we cannot conclude if this effect is mainly driven by its age or its mass.

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: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 29 Jun 2020 09:07
Last Modified: 29 Jun 2020 09:15
DOI or Identification number: 10.1093/mnras/staa1185
URI: http://researchonline.ljmu.ac.uk/id/eprint/13200

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