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dc.contributor.authorRendle, B M
dc.contributor.authorMiglio, A
dc.contributor.authorChiappini, C
dc.contributor.authorValentini, M
dc.contributor.authorDavies, G R
dc.contributor.authorMosser, B
dc.contributor.authorElsworth, Y
dc.contributor.authorGarcía, R A
dc.contributor.authorMathur, S
dc.contributor.authorJofré, P
dc.contributor.authorWorley, C C
dc.contributor.authorCasagrande, L
dc.contributor.authorGirardi, L
dc.contributor.authorLund, M N
dc.contributor.authorFeuillet, D K
dc.contributor.authorGavel, A
dc.contributor.authorMagrini, L
dc.contributor.authorKhan, S
dc.contributor.authorRodrigues, T S
dc.contributor.authorJohnson, J A
dc.contributor.authorCunha, K
dc.contributor.authorLane, R L
dc.contributor.authorNitschelm, C
dc.contributor.authorChaplin, W J
dc.date.accessioned2020-02-01T01:45:48Z
dc.date.available2020-02-01T01:45:48Z
dc.date.issued2019-11-04
dc.identifier.citationB M Rendle, A Miglio, C Chiappini, M Valentini, G R Davies, B Mosser, Y Elsworth, R A García, S Mathur, P Jofré, C C Worley, L Casagrande, L Girardi, M N Lund, D K Feuillet, A Gavel, L Magrini, S Khan, T S Rodrigues, J A Johnson, K Cunha, R L Lane, C Nitschelm, W J Chaplin, The K2 Galactic Caps Project – going beyond the Kepler field and ageing the Galactic disc, Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 4, December 2019, Pages 4465–4480, https://doi.org/10.1093/mnras/stz2454en_US
dc.identifier.issn0035-8711
dc.identifier.doi10.1093/mnras/stz2454
dc.identifier.urihttp://hdl.handle.net/10150/636858
dc.description.abstractAnalyses of data from spectroscopic and astrometric surveys have led to conflicting results concerning the vertical characteristics of the Milky Way. Ages are often used to provide clarity, but typical uncertainties of >40 per cent from photometry restrict the validity of the inferences made. Using the Kepler APOKASC sample for context, we explore the global population trends of two K2 campaign fields (3 and 6), which extend further vertically out of the Galactic plane than APOKASC. We analyse the properties of red giant stars utilizing three asteroseismic data analysis methods to cross-check and validate detections. The Bayesian inference tool PARAM is used to determine the stellar masses, radii, and ages. Evidence of a pronounced red giant branch bump and an [a/Fe] dependence on the position of the red clump is observed from the K2 fields radius distribution. Two peaks in the age distribution centred at similar to 5 and similar to 12 Gyr are found using a sample with sigma(age) < 35 per cent. In comparison with Kepler, we find the older peak to be more prominent for K2. This age bimodality is also observed based on a chemical selection of low-[alpha/Fe] (<= 0.1) and high-[alpha/Fe] (>0.1) stars. As a function of vertical distance from the Galactic mid-plane (|Z|), the age distribution shows a transition from a young to old stellar population with increasing |Z| for the K2 fields. Further coverage of campaign targets with high-resolution spectroscopy is required to increase the yield of precise ages achievable with asteroseismology.en_US
dc.description.sponsorshipUK Science and Technology Facilities Council (STFC) Science & Technology Facilities Council (STFC); European Research Council (ERC) [772293]; German Research Foundation (DFG) [CH1188/21]; ChETEC COST Action - COST (European Cooperation in Science and Technology) [CA16117]; Australian Research Council [FT160100402]; National Aeronautics & Space Administration (NASA) [NNX16AJ17G, NNX15AF13G]; National Science Foundation (NSF) [AST-1411685]; Ramon y Cajal fellowship Ministry of Education and Science, Spain [RYC-2015-17697]; CNES Centre National D'etudes Spatiales; FONDECYT Iniciacion Grant Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) [11170174]; Premiale 2015 MITiC; Swedish National Space Board; Danish National Research Foundation [DNRF106]; Alfred P. Sloan Foundation; U.S. Department of Energy Office of ScienceUnited States Department of Energy (DOE); Center for High-Performance Computing at the University of Utah; Brazilian Participation Group; Carnegie Institution for Science, Carnegie Mellon University; Chilean Participation Group; French Participation Group; Harvard-Smithsonian Center for Astrophysics; Instituto de Astrofisica de Canarias; Johns Hopkins University; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo; Korean Participation Group; Lawrence Berkeley National LaboratoryUnited States Department of Energy (DOE); Leibniz Institut fur Astrophysik Potsdam (AIP); Max-Planck-Institut fur Astronomie (MPIA Heidelberg); Max-Planck-Institut fur Astrophysik (MPA Garching); Max-Planck-Institut fur Extraterrestrische Physik (MPE); National Astronomical Observatories of China; New Mexico State University; New York University; University of Notre Dame; Observatorio Nacional/MCTI; Ohio State University Ohio State University; Pennsylvania State University; Shanghai Astronomical Observatory; United Kingdom Participation Group; Universidad Nacional Autonoma de Mexico Universidad Nacional Autonoma de Mexico; University of Arizona; University of Colorado Boulder; University of Oxford; University of Portsmouth; University of Utah; University of Virginia; University of Washington University of Washington; University of Wisconsin; Vanderbilt University; Yale Universityen_US
dc.language.isoenen_US
dc.publisherOXFORD UNIV PRESSen_US
dc.rightsCopyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectasteroseismologyen_US
dc.subjectstars: late typeen_US
dc.subjectGalaxy: stellar content, structureen_US
dc.titleThe K2 Galactic Caps Project – going beyond the Kepler field and ageing the Galactic discen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizonaen_US
dc.identifier.journalMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETYen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleMonthly Notices of the Royal Astronomical Society
dc.source.volume490
dc.source.issue4
dc.source.beginpage4465
dc.source.endpage4480
refterms.dateFOA2020-02-01T01:45:49Z


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