Expanding the time domain of multiple populations: evidences of nitrogen variations in the ~1.5 Gyr old star cluster NGC 1783
arXiv:2112.06964 · doi:10.3847/2041-8213/ac424a
Abstract
We present the result of a detailed analysis of HST UV and optical deep images of the massive and young (~1.5 Gyr) stellar cluster NGC 1783 in the Large Magellanic Cloud. This system does not show evidences of multiple populations (MPs) along the red giant branch (RGB) stars. However, we find that the cluster main-sequence (MS) shows evidence of a significant broadening (50% larger than what is expected from photometric errors) along with hints of possible bimodality in the MP sensitive (F343N - F438W, F438W) color-magnitude-diagram (CMD). Such an effect is observed in all color combinations including the F343N filter, while it is not found in the optical CMDs. This observational evidence suggests we might have found light-element chemical abundance variations along the MS of NGC 1783, which represents the first detection of MPs in a system younger than 2 Gyr. A comparison with isochrones including MP-like abundances shows that the observed broadening is compatible with a N abundance enhancement of Delta([N/Fe]) ~0.3. Our analysis also confirms previous results about the lack of MPs along the cluster RGB. However, we find that the apparent disagreement between the results found on the MS and the RGB is compatible with the mixing effects linked to the first dredge-up. This study provides new key information about the MP phenomenon and suggests that star clusters form in a similar way at any cosmic age.
Accepted for publication in ApJL
References in corpus (31)
- Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
- Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. IX. The Atlas of Multiple Stellar Populations
- What is a globular cluster? An observational perspective
- Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
- The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud
- Age as a Major Factor in the Onset of Multiple Populations in Stellar Clusters
- Multiple populations in the old and massive Small Magellanic Cloud globular cluster NGC121
- Nitrogen abundances and multiple stellar populations in the globular clusters of the Fornax dSph
- No evidence of chemical anomalies in the bimodal turnoff cluster NGC 1806 in the LMC
- Constraining globular cluster formation through studies of young massive clusters - V. ALMA observations of clusters in the Antennae
- How stellar rotation shapes the colour magnitude diagram of the massive intermediate-age star cluster NGC 1846
- The search for multiple populations in Magellanic Clouds clusters - V. Correlation between cluster age and abundance spreads
- A family picture: tracing the dynamical path of the structural properties of multiple populations in globular clusters
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XVIII. Proper-motion kinematics of multiple stellar populations in the core regions of NGC 6352
- Dynamical masses and mass-to-light ratios of resolved massive star clusters -- II. Results for 26 star clusters in the Magellanic Clouds
- An extremely low-mass He white dwarf orbiting the millisecond pulsar J1342+2822B in the globular cluster M3
- Digging for relics of the past: the ancient and obscured bulge globular cluster NGC6256
- PSR J1641+3627F: a low-mass He white dwarf orbiting a possible high-mass neutron star in the globular cluster M13
- Radial variation of the stellar mass functions in the globular clusters M15 and M30: clues of a non-standard IMF?
- Proper motions and structural parameters of the Galactic globular cluster M71
- Linking globular cluster formation at low and high redshift through the age-metallicity relation in E-MOSAICS
- Exploring the role of binarity in the origin of the bimodal rotational velocity distribution in stellar clusters
- The intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud
- Photometric characterization of multiple populations in star clusters: The impact of the first dredge-up
- Leveraging HST with MUSE: I. Sodium abundance variations within the 2 Gyr-old cluster NGC 1978
- On the Nitrogen variation in ~2 Gyr old massive star clusters in the Large Magellanic Cloud
- Searching for globular cluster chemical anomalies on the main sequence of a young massive cluster
- Multiple stellar populations at less evolved stages-II: no evidence of significant helium spread among NGC 1846 dwarfs
- Kinematic complexity around NGC419: resolving the proper motion of the cluster, the Small Magellanic Cloud and the Magellanic Bridge
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- On the origin of UV-dim stars: a population of rapidly rotating shell stars?
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- The structural properties of multiple populations in the dynamically young globular cluster NGC 2419
- Evidence of globular cluster abundance anomalies in the SMC intermediate-age cluster Kron 3
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