The vertical Na–O relation in the bulge globular cluster NGC 6553
Cargando...
Archivos
Fecha
2020-01
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Licencia CC
Resumen
In this article, we present a detailed chemical analysis of seven red giant members of
NGC 6553 using high-resolution spectroscopy from VLT FLAMES. We obtained the stellar
parameters (Teff, Log(g), vt, [Fe/H]) of these stars from the spectra, and we measured the
chemical abundance for 20 elements, including light elements, iron-peak elements, α-elements,
and neutron-capture elements. The metallicities in our sample stars are consistent with a
homogeneous distribution. We found a mean of [Fe/H] = −0.14 ± 0.07 dex, in agreement
with other studies. Using the α-elements Mg, Si, Ca, and Ti, we obtain the mean of [α/Fe]
= 0.11 ± 0.05. We found a vertical relation between Na and O, characterized by a significant
spread in Na and an almost non-existent spread in O. In fact, Na and Al are the only two
light elements with a large intrinsic spread, which demonstrates the presence of multiple
populations (MPs). An intrinsic spread in Mg is not detected in this study. The α, iron-peak,
and neutron-capture elements show good agreement with the trend of the bulge field stars,
indicating similar origin and evolution, in concordance with our previous studies for two other
bulge globular clusters (NGC 6440 and NGC 6528).
Notas
Indexación: Scopus
Palabras clave
stars: abundances – globular clusters: individual (NGC 6553) – Bulge.
Citación
Monthly Notices of the Royal Astronomical SocietyOpen AccessIssue 3, Pages 3742 - 37521 March 2020