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http://hdl.handle.net/20.500.12386/26304
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Ryde, N. | en_US |
dc.contributor.author | Fritz, T. K. | en_US |
dc.contributor.author | Rich, R. M. | en_US |
dc.contributor.author | Thorsbro, B. | en_US |
dc.contributor.author | Schultheis, M. | en_US |
dc.contributor.author | ORIGLIA, Livia | en_US |
dc.contributor.author | Chatzopoulos, S. | en_US |
dc.date.accessioned | 2020-07-03T09:11:03Z | - |
dc.date.available | 2020-07-03T09:11:03Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26304 | - |
dc.description.abstract | We report the first results from our program to examine the metallicity distribution of the Milky Way nuclear star cluster connected to Sgr A*, with the goal of inferring the star formation and enrichment history of this system, as well as its connection and relationship with the central 100 pc of the bulge/bar system. We present the first high-resolution (R ∼ 24,000), detailed abundance analysis of a K = 10.2 metal-poor, alpha-enhanced red giant projected at 1.5 pc from the Galactic center, using NIRSPEC on Keck II. A careful analysis of the dynamics and color of the star locates it at about {26}<SUB>-16</SUB><SUP>+54</SUP> pc line-of-sight distance in front of the nuclear cluster. It probably belongs to one of the nuclear components (cluster or disk), not to the bar/bulge or classical disk. A detailed spectroscopic synthesis, using a new line list in the K band, finds [Fe/H] ∼ -1.0 and [α/Fe] ∼ +0.4, consistent with stars of similar metallicity in the bulge. As known giants with comparable [Fe/H] and alpha enhancement are old, we conclude that this star is most likely to be a representative of the ∼10 Gyr old population. This is also the most metal-poor-confirmed red giant yet discovered in the vicinity of the nuclear cluster of the Galactic center. We consider recent reports in the literature of a surprisingly large number of metal-poor giants in the Galactic center, but the reported gravity of {log}g∼ 4 for these stars calls into question their reported metallicities. | en_US |
dc.language.iso | eng | en_US |
dc.title | Detailed Abundance Analysis of a Metal-poor Giant in the Galactic Center | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/831/1/40 | en_US |
dc.identifier.scopus | 2-s2.0-84994275468 | en_US |
dc.identifier.isi | 000387229300003 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/831/1/40 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 831 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 40 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...831...40R | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-6040-5849 | - |
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