A MUSE study of the inner bulge globular cluster Terzan 9 : a fossil record in the Galaxy
| العنوان: | A MUSE study of the inner bulge globular cluster Terzan 9 : a fossil record in the Galaxy |
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| المؤلفون: | Ernandes, Heitor, Dias, Bruno Moreira de Souza, Barbuy, Beatriz, Kamann, Sebastian, Ortolani, Sergio, Cantelli, Elvis William Carvalho, Bica, Eduardo Luiz Damiani, Rossi, Luca James |
| المصدر: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
| بيانات النشر: | Zenodo, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Abundances [Stars], Individual : Terzan 9 [Globular clusters], Espectros astronômicos, Astrophysics::Cosmology and Extragalactic Astrophysics, Metalicidade, Aglomerados globulares, Bulge [Galaxy], Astrophysics::Galaxy Astrophysics |
| الوصف: | Context. Moderately metal-poor inner bulge globular clusters are relics of a generation of long-lived stars that formed in the early Galaxy. Terzan 9, projected at 4°.12 from the Galactic center, is among the most central globular clusters in the Milky Way, showing an orbit which remains confined to the inner 1 kpc. Aims. Our aim is the derivation of the cluster’s metallicity, together with an accurate measurement of the mean radial velocity. In the literature, metallicities in the range between −2.0 < [Fe/H] < −1.0 have been estimated for Terzan 9 based on color-magnitude diagrams and CaII triplet (CaT) lines. Methods. Given its compactness, Terzan 9 was observed using the Multi Unit Spectroscopic Explorer (MUSE) at the Very Large Telescope. The extraction of spectra from several hundreds of individual stars allowed us to derive their radial velocities, metallicities, and [Mg/Fe]. The spectra obtained with MUSE were analysed through full spectrum fitting using the ETOILE code. Results. We obtained a mean metallicity of [Fe/H] ≈ −1.10 ±0.15, a heliocentric radial velocity of vhr = 58.1 ± 1.1 km s−1, and a magnesium-to-iron [Mg/Fe] = 0.27 ± 0.03. The metallicity-derived character of Terzan 9 sets it among the family of the moderately metal-poor Blue Horizontal Branch clusters HP 1, NGC 6558, and NGC 6522. |
| وصف الملف: | application/pdf |
| DOI: | 10.5281/zenodo.2651063 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11cac4de75799caa48fbf59a29bf33c2Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....11cac4de75799caa48fbf59a29bf33c2 |
| قاعدة البيانات: | OpenAIRE |
| DOI: | 10.5281/zenodo.2651063 |
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