A chemical analysis of seven red giants of the Galactic cluster NGC 4349
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2022)
摘要
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 C-12/C-13 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 alpha- and s-process elements.
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关键词
stars: abundances, stars: fundamental parameters, open clusters and associations: individual: NGC 4349, Galaxy: disc
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