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Bastian, N, Lardo, C, Usher, CG, Kamann, S, Larsen, SS, Cabrera-Ziri, I, Chantereau, W, Martocchia, S, Salaris, M, Asa'd, R and Hilker, M (2020) Searching for Multiple Populations in the Integrated Light of the Young and Extremely Massive Clusters in the Merger Remnant NGC~7252. Monthly Notices of the Royal Astronomical Society, 494 (1). pp. 332-337. ISSN 0035-8711
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Searching for Multiple Populations in the Integrated Light of the Young and Extremely Massive Clusters in the Merger Remnant NGC7252.pdf - Published Version Download (752kB) | Preview |
Abstract
Recent work has shown that the properties of multiple populations within massive stellar clusters (i.e., in the extent of their abundance variations as well as the fraction of stars that show the anomalous chemistry) depend on the mass as well as the age of the host cluster. Such correlations are largely unexpected in current models for the formation of multiple populations and hence provide essential insight into their origin. Here we extend or previous study into the presence or absence of multiple populations using integrated light spectroscopy of the ~600Myr, massive (~10^7-10^8~M) clusters, W3 and W30, in the galactic merger remnant, NGC 7252. Due to the extreme mass of both clusters, the expectation is that they should host rather extreme abundance spreads, manifested through, e.g., high mean [Na/Fe] abundances. However, we do not find evidence for a strong [Na/Fe] enhancement, with the observations being consistent with the solar value. This suggests that age is playing a key role, or alternatively that multiple populations only manifest below a certain stellar mass, as the integrated light at all ages above ~100Myr is dominated by stars near or above the main sequence turn-off.
| Item Type: | Article |
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| 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 |
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| Date Deposited: | 13 Mar 2020 12:30 |
| Last Modified: | 16 Aug 2022 10:00 |
| DOI or ID number: | 10.1093/mnras/staa716 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/12483 |
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