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Gaia-ESO survey: Lithium abundances in open cluster Red Clump stars

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cam.depositDate2022-01-03
cam.issuedOnline2021-11-05
cam.orpheus.success2022-01-04 - Embargo set during processing via Fast-track
dc.contributor.authorMagrini, L
dc.contributor.authorSmiljanic, R
dc.contributor.authorFranciosini, E
dc.contributor.authorPasquini, L
dc.contributor.authorRandich, S
dc.contributor.authorCasali, G
dc.contributor.authorViscasillas Vazquez, Carlos
dc.contributor.authorBragaglia, A
dc.contributor.authorSpina, L
dc.contributor.authorBiazzo, K
dc.contributor.authorTautvaisiene, G
dc.contributor.authorMasseron, T
dc.contributor.authorVan der Swaelmen, M
dc.contributor.authorPancino, E
dc.contributor.authorJimenez-Esteban, F
dc.contributor.authorGuiglion, G
dc.contributor.authorMartell, S
dc.contributor.authorBensby, T
dc.contributor.authorD'Orazi, V
dc.contributor.authorBaratella, M
dc.contributor.authorKorn, A
dc.contributor.authorJofre, P
dc.contributor.authorGilmore, G
dc.contributor.authorWorley, C
dc.contributor.authorHourihane, A
dc.contributor.authorGonneau, A
dc.contributor.authorSacco, GG
dc.contributor.authorMorbidelli, L
dc.contributor.orcidGilmore, Gerard [0000-0003-4632-0213]
dc.date.accessioned2022-01-05T00:33:05Z
dc.date.available2022-01-05T00:33:05Z
dc.date.issued2021
dc.date.updated2022-01-03T16:12:27Z
dc.description.abstract<jats:p><jats:italic>Context.</jats:italic> It has recently been suggested that all giant stars with masses below 2 <jats:italic>M</jats:italic><jats:sub>⊙</jats:sub> suffer an episode of surface lithium enrichment between the tip of the red giant branch (RGB) and the red clump (RC).</jats:p> <jats:p><jats:italic>Aims.</jats:italic> We test if the above result can be confirmed in a sample of RC and RGB stars that are members of open clusters.</jats:p> <jats:p><jats:italic>Methods.</jats:italic> We discuss Li abundances in six open clusters with ages between 1.5 and 4.9 Gyr (turn-off masses between 1.1 and 1.7 <jats:italic>M</jats:italic><jats:sub>⊙</jats:sub>). We compare these observations with the predictions of different models that include rotation-induced mixing, thermohaline instability, mixing induced by the first He flash, and energy losses by neutrino magnetic moment.</jats:p> <jats:p><jats:italic>Results.</jats:italic> In six clusters, we find close to 35% of RC stars have Li abundances that are similar or higher than those of upper RGB stars. This can be a sign of fresh Li production. Because of the extra-mixing episode connected to the luminosity bump, the expectation has been for RC stars to have systematically lower surface Li abundances. However, we cannot confirm that this possible Li production is ubiquitous. For about 65% of RC giants, we can only determine upper limits in abundances that could be hiding very low Li content.</jats:p> <jats:p><jats:italic>Conclusions.</jats:italic> Our results indicate the possibility that Li is being produced in the RC, at levels that would not typically permit the classification of these the stars as Li rich. The determination of their carbon isotopic ratio would help to confirm that the RC giants have suffered extra mixing followed by subsequent Li enrichment. The Li abundances of the RC stars can be qualitatively explained by the models including an additional mixing episode close to the He flash.</jats:p>
dc.identifier.doi10.17863/CAM.79421
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/331972
dc.language.isoeng
dc.publisherEDP Sciences
dc.publisher.departmentInstitute of Astronomy
dc.publisher.urlhttp://dx.doi.org/10.1051/0004-6361/202141275
dc.rightsAll Rights Reserved
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserved
dc.subjectstars: abundances
dc.subjectstars: evolution
dc.subjectstars: low-mass
dc.subjectopen clusters and associations: general
dc.title<i>Gaia</i>-ESO survey: Lithium abundances in open cluster Red Clump stars
dc.typeArticle
dcterms.dateAccepted2021-08-26
prism.endingPageA23
prism.numberARTN A23
prism.publicationDate2021
prism.publicationNameASTRONOMY & ASTROPHYSICS
prism.startingPageA23
prism.volume655
pubs.funder-project-idEuropean Research Council (320360)
pubs.funder-project-idLeverhulme Trust (RPG-2012-541)
pubs.funder-project-idSTFC (ST/T003081/1)
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
pubs.licence-identifierapollo-deposit-licence-2-1
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1051/0004-6361/202141275

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