Detailed Chemical Abundances of Star Clusters in the Large Magellanic Cloud
arXiv:2203.11868 · doi:10.3847/1538-4357/ac5f3e
Abstract
We derive the first detailed chemical abundances of three star clusters in the Large Magellanic Cloud (LMC), NGC1831 (436+/-22 Myr), NGC1856 (350+/-18 Myr) and [SL63]268 (1230+/-62 Myr) using integrated-light spectroscopic observations obtained with the Magellan Echelle spectrograph on Magellan Baade telescope. We derive [Fe/H], [Mg/Fe], [Ti/Fe], [Ca/Fe], [Ni/Fe], [Mn/Fe], [Cr/Fe] and [Na/Fe] for the three clusters. Overall, our results match the LMC abundances obtained in the literature as well as those predicted by detailed chemical evolution models. For clusters NGC1831 and NGC1856, the [Mg/Fe] ratios appear to be slightly depleted compared to [Ca/Fe] and [Ti/Fe]. This could be hinting at the well-known Mg-Al abundance anti-correlation observed in several Milky Way globular clusters. We note, however, that higher signal-to-noise observations are needed to confirm such a scenario, particularly for NGC 1831. We also find a slightly enhanced integrated-light [Na/Fe] ratio for cluster [SL63]268 compared to those from the LMC field stars, possibly supporting a scenario of intracluster abundance variations. We stress that detailed abundance analysis of individual stars in these LMC clusters is required to confirm the presence or absence of MSPs.
Accepted for publication in ApJ
References in corpus (17)
- A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
- Galactic chemical evolution: Carbon through Zinc
- The MagE Spectrograph
- Chemical composition and constraints on mass loss for globular clusters in dwarf galaxies: WLM and IKN
- Red Supergiants as Cosmic Abundance Probes: The Magellanic Clouds
- Three discrete groups with homogeneous chemistry along the red giant branch in the globular cluster NGC 2808
- The First Metallicity Study of M83 using the integrated UV light of Star Clusters
- A search for star clusters in the outskirts of the Large Magellanic Cloud: indication of clusters in the age gap
- Metallicities of Young Massive Clusters in NGC 5236 (M83)
- On the Nitrogen variation in ~2 Gyr old massive star clusters in the Large Magellanic Cloud
- NBursts: Simultaneous Extraction of Internal Kinematics and Parametrized SFH from Integrated Light Spectra
- On the Precision of Full-spectrum Fitting of Simple Stellar Populations. I. Well-sampled Populations
- Searching for Multiple Populations in the Integrated Light of the Young and Extremely Massive Clusters in the Merger Remnant NGC~7252
- On the precision of full-spectrum fitting of simple stellar populations. II. The dependence on star cluster mass in the wavelength range 0.3-5.0 m
- On the Precision of Full-spectrum Fitting of Stellar Populations. III. Identifying Age Spreads
- On the Precision of Full-Spectrum Fitting of Simple Stellar Populations. IV. A Systematic Comparison with Results from Colour-Magnitude Diagrams
- Multiple populations of Hbeta emission line stars in the Large Magellanic Cloud cluster NGC1971
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