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dc.contributor.author
Minchev, I.
dc.contributor.author
Matijevic, G.
dc.contributor.author
Hogg, D.W.
dc.contributor.author
Guiglion, G.
dc.contributor.author
Steinmetz, M.
dc.contributor.author
Anders, F.
dc.contributor.author
Chiappini, C.
dc.contributor.author
Martig, M.
dc.contributor.author
Queiroz, A.
dc.contributor.author
Scannapieco, Cecilia
dc.date.available
2022-01-21T15:41:52Z
dc.date.issued
2019-05
dc.identifier.citation
Minchev, I.; Matijevic, G.; Hogg, D.W.; Guiglion, G.; Steinmetz, M.; et al.; Yule-Simpson's paradox in galactic archaeology; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 487; 3; 5-2019; 3946-3957
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/150482
dc.description.abstract
Simpson's paradox, or Yule-Simpson effect, arises when a trend appears in different subsets of data but disappears or reverses when these subsets are combined. We describe here seven cases of this phenomenon for chemo-kinematical relations believed to constrain the MilkyWay disc formation and evolution. We show that interpreting trends in relations, such as the radial and vertical chemical abundance gradients, the age-metallicity relation, and the metallicity- rotational velocity relation (MVR), can lead to conflicting conclusions about the Galaxy past if analyses marginalize over stellar age and/or birth radius. It is demonstrated that the MVR in RAVE giants is consistent with being always strongly negative, when narrow bins of [Mg/Fe] are considered. This is directly related to the negative radial metallicity gradients of stars grouped by common age (mono-age populations) due to the inside-out disc formation. The effect of the asymmetric drift can then give rise to a positive MVR trend in high-[a/Fe] stars, with a slope dependent on a given survey's selection function and observational uncertainties. We also study the variation of lithium abundance, A(Li), with [Fe/H] of AMBRE:HARPS dwarfs. A strong reversal in the positive A(Li)-[Fe/H] trend of the total sample is found for mono-age populations, flattening for younger groups of stars. Dissecting by birth radius shows strengthening in the positive A(Li)-[Fe/H] trend, shifting to higher [Fe/H] with decreasing birth radius; these observational results suggest new constraints on chemical evolutionmodels. This work highlights the necessity for precise age estimates for large stellar samples covering wide spatial regions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
GALAXY: ABUNDANCES
dc.subject
GALAXY: DISC
dc.subject
GALAXY: EVOLUTION
dc.subject
GALAXY: KINEMATICS AND DYNAMICS
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GALAXY: STELLAR CONTENT
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Yule-Simpson's paradox in galactic archaeology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-12-16T18:33:44Z
dc.journal.volume
487
dc.journal.number
3
dc.journal.pagination
3946-3957
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Minchev, I.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Matijevic, G.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Hogg, D.W.. No especifíca;
dc.description.fil
Fil: Guiglion, G.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Steinmetz, M.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Anders, F.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Chiappini, C.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Martig, M.. Liverpool John Moores University; Reino Unido
dc.description.fil
Fil: Queiroz, A.. Leibniz Institut Fuer Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Scannapieco, Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stz1239/5486117
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stz1239
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