On the Nitrogen variation in ~2 Gyr old massive star clusters in the Large Magellanic Cloud
| Autor: | Emanuele Dalessandro, N. Kacharov, W. Chantereau, S. Martocchia, Sebastian Kamann, Nate Bastian, I. Cabrera-Ziri, Carmela Lardo, Maurizio Salaris, Marina Rejkuba, S. S. Larsen |
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| Přispěvatelé: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Martocchia S., Lardo C., Rejkuba M., Kamann S., Bastian N., Larsen S., Cabrera-Ziri I., Chantereau W., Dalessandro E., Kacharov N., Salaris M. |
| Rok vydání: | 2021 |
| Předmět: |
Stars: abundance
Astronomy Hertzsprung–Russell and colour–magnitude diagram Techniques: spectroscopic FOS: Physical sciences Astrophysics Dredge-up 01 natural sciences Photometry (optics) Galaxies: individual: LMC 0103 physical sciences Spectroscopy Large Magellanic Cloud 010303 astronomy & astrophysics QC Solar and Stellar Astrophysics (astro-ph.SR) QB Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Red-giant branch Stars Star cluster Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science [SDU]Sciences of the Universe [physics] Globular cluster Astrophysics of Galaxies (astro-ph.GA) Galaxies: star cluster Techniques: photometric |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 505 (4), pp.5389-5402. ⟨10.1093/mnras/stab1590⟩ Monthly Notices of the Royal Astronomical Society, 505, 5389-5402 Monthly Notices of the Royal Astronomical Society, 505, 4, pp. 5389-5402 |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.48550/arxiv.2106.02054 |
| Popis: | We present ESO/VLT FORS2 low resolution spectroscopy of red giant branch stars in three massive, intermediate age ($\sim 1.7-2.3$ Gyr) star clusters in the Large Magellanic Cloud. We measure CH and CN index bands at 4300A, and 3883A, as well as [C/Fe] and [N/Fe] abundance ratios for 24, 21 and 12 member stars of NGC 1978, NGC 1651, NGC 1783, respectively. We find a significant intrinsic spread in CN in NGC 1978 and NGC 1651, a signal of multiple stellar populations (MPs) within the clusters. On the contrary, we report a null CN spread in NGC 1783 within our measurement precision. For NGC 1978, we separated the two populations in the CN distribution and we translated the CN spread into an internal N variation $\Delta$[N/Fe]$=0.63\pm0.49$ dex. For NGC 1651 and NGC 1783, we put upper limits on the N abundance variations of $\Delta$[N/Fe]$\leq 0.2, 0.4$ dex, respectively. The spectroscopic analysis confirms previous results from HST photometry, where NGC 1978 was found to host MPs in the form of N spreads, while slightly younger clusters (e.g. NGC 1783, $ Comment: Accepted for publication in MNRAS, 15 pages, 11 figures |
| Databáze: | OpenAIRE |
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