Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/28718
Campo DC | Valore | Lingua |
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dc.contributor.author | Duong, L. | en_US |
dc.contributor.author | Freeman, K. C. | en_US |
dc.contributor.author | Asplund, M. | en_US |
dc.contributor.author | Casagrande, L. | en_US |
dc.contributor.author | Buder, S. | en_US |
dc.contributor.author | Lind, K. | en_US |
dc.contributor.author | Ness, M. | en_US |
dc.contributor.author | Bland-Hawthorn, J. | en_US |
dc.contributor.author | De Silva, G. M. | en_US |
dc.contributor.author | D'ORAZI, VALENTINA | en_US |
dc.contributor.author | Kos, J. | en_US |
dc.contributor.author | Lewis, G. F. | en_US |
dc.contributor.author | Lin, J. | en_US |
dc.contributor.author | Martell, S. L. | en_US |
dc.contributor.author | Schlesinger, K. | en_US |
dc.contributor.author | Sharma, S. | en_US |
dc.contributor.author | Simpson, J. D. | en_US |
dc.contributor.author | Zucker, D. B. | en_US |
dc.contributor.author | Zwitter, T. | en_US |
dc.contributor.author | Anguiano, B. | en_US |
dc.contributor.author | Da Costa, G. S. | en_US |
dc.contributor.author | Hyde, E. | en_US |
dc.contributor.author | Horner, J. | en_US |
dc.contributor.author | Kafle, P. R. | en_US |
dc.contributor.author | Nataf, D. M. | en_US |
dc.contributor.author | Reid, W. | en_US |
dc.contributor.author | Stello, D. | en_US |
dc.contributor.author | Ting, Y. -S. | en_US |
dc.contributor.author | Wyse, R. F. G. | en_US |
dc.date.accessioned | 2020-12-04T15:36:57Z | - |
dc.date.available | 2020-12-04T15:36:57Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28718 | - |
dc.description.abstract | Using data from the GALAH pilot survey, we determine properties of the Galactic thin and thick discs near the solar neighbourhood. The data cover a small range of Galactocentric radius (7.9 ≲ R_GC ≲ 9.5 kpc), but extend up to 4 kpc in height from the Galactic plane, and several kpc in the direction of Galactic anti-rotation (at longitude 260° ≤ ℓ ≤ 280°). This allows us to reliably measure the vertical density and abundance profiles of the chemically and kinematically defined `thick' and `thin' discs of the Galaxy. The thin disc (low-α population) exhibits a steep negative vertical metallicity gradient, at d[M/H]/dz = -0.18 ± 0.01 dex kpc<SUP>-1</SUP>, which is broadly consistent with previous studies. In contrast, its vertical α-abundance profile is almost flat, with a gradient of d[α/M]/dz = 0.008 ± 0.002 dex kpc<SUP>-1</SUP>. The steep vertical metallicity gradient of the low-α population is in agreement with models where radial migration has a major role in the evolution of the thin disc. The thick disc (high-α population) has a weaker vertical metallicity gradient d[M/H]/dz = -0.058 ± 0.003 dex kpc<SUP>-1</SUP>. The α-abundance of the thick disc is nearly constant with height, d[α/M]/dz = 0.007 ± 0.002 dex kpc<SUP>-1</SUP>. The negative gradient in metallicity and the small gradient in [α/M] indicate that the high-α population experienced a settling phase, but also formed prior to the onset of major Type Ia supernova enrichment. We explore the implications of the distinct α-enrichments and narrow [α/M] range of the sub-populations in the context of thick disc formation. | en_US |
dc.language.iso | eng | en_US |
dc.title | The GALAH survey: properties of the Galactic disc(s) in the solar neighbourhood | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/sty525 | en_US |
dc.identifier.scopus | 2-s2.0-85048491959 | en_US |
dc.identifier.isi | 000432659800061 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article-abstract/476/4/5216/4911537 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 476 | en_US |
dc.relation.issue | 4 | en_US |
dc.relation.firstpage | 5216 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018MNRAS.476.5216D | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems | 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.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.orcid | 0000-0002-2662-3762 | - |
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