A chemical analysis of seven red giants of the Galactic cluster NGC 4349
| Autor: | N Holanda, André A Ramos, V J Peña Suárez, Cintia F Martinez, C B Pereira |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 516:4484-4496 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stac2496 |
| Popis: | In this study, we undertake a comprehensive investigation of seven red giant stars of NGC 4349 (#005, #009, #079, #127, #168, #174, and #203) and one non-member star (#053). Accurate abundances of 19 chemical species and 12C/13C isotopic ratio are determined using high-signal-to-noise FEROS spectra and standard spectroscopic analysis. Seven of the giant stars in our sample present a mean iron abundance of [Fe/H] = −0.16 ± 0.04, while the star NGC 4349−053 is classified as a non-member of the cluster, based on the membership analysis with the upmask code. Also, we estimate an age of 282 ± 32 Myr and E(B − V) = 0.40 ±0.02, after fitting an isochrone for the metallicity of NGC 4349 and with the photometric and astrometric data sets from the literature. Furthermore, we carry out for the first time a chemical composition study for star $\#079$, so far neglected in the literature. This red giant star is in a binary system and presents chemical abundances compatible with the open cluster. However, its parallax and proper-motion components suggest otherwise. Finally, we identify NGC 4349 as a young open cluster with slightly enriched s-process elements ([s/Fe] = +0.16 ± 0.05 dex). In the context of the so-called chemical clocks, NGC 4349 presents a concordance with some observed relationships for H-burning elements and α- and s-process elements. |
| Databáze: | OpenAIRE |
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