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http://hdl.handle.net/1843/51883| Type: | Artigo de Periódico |
| Title: | NGC 6124: a young open cluster with anomalous-and fast-rotating giant stars |
| Authors: | Nacizo Holanda Natalia Drake Wagner José Corradi Barbosa F. A. Ferreira Francisco Maia Laura Magrini J. R. P. da Silva C. B. Pereira |
| Abstract: | We present the results of a chemical analysis of fast and anomalous rotator giants members of the young open cluster NGC6124. For this purpose, we carried out abundances of the mixing sensitive species such as Li, C, N, Na, and 12C/13C isotopic ratio, as well as other chemical species for a sample of four giants among the seven observed ones. This study is based on standard spectral analysis technique using high-resolution spectroscopic data. We also performed an investigation of the rotational velocity (v sin i) once this sample exhibits abnormal values–giant stars commonly present rotational velocities of few kms−1. In parallel, we have performed a membership study, making use of the third data release from ESA Gaia mission. Based on these data, we estimated a distance of d = 630pc and an age of 178Myr through isochrone fitting. After that procedure, we matched all the information raised and investigated the evolutionary stages and thermohaline mixing model through of spectroscopic Teff and log g and mixing tracers, such as 12C/13C and Na, of the studied stars. We derived a low mean metallicity of [Fe/H] = −0.13 ± 0.05 and a modest enhancement of the elements created by the s-process, such as Y, Zr, La, Ce, and Nd, which is in agreement with what has already been reported in the literature for young clusters. The giants analysed have homogeneous abundances, except for lithium abundance [log (Li)NLTE = 1.08 ± 0.42] and this may be associated with a combination of mechanisms that act increasing or decreasing lithium abundances in stellar atmospheres. |
| Subject: | Estrelas Galaxias - Aglomerados |
| language: | por |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1093/mnras/stab2836 |
| URI: | http://hdl.handle.net/1843/51883 |
| Issue Date: | 2021 |
| metadata.dc.url.externa: | https://academic.oup.com/mnras/article/508/4/5786/6381707 |
| metadata.dc.relation.ispartof: | Monthly Notices of the Royal Astronomical Society |
| Appears in Collections: | Artigo de Periódico |
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