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The lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1

Nordlander, Thomas; Bessell, Michael; Da Costa, Gary; Mackey, Dougal; Asplund, Martin; Casey, A. R.; Chiti, Anirudh; Ezzeddine, Rana; Frebel, Anna; Lind, K.; Marino, Anna Fabiola; Murphy, Simon; Norris, John; Schmidt, Brian; Yong, David

Description

We report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [Fe/H] = −6.2 ± 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbonenhanced, [C/Fe] = 3.9 ± 0.2, while other abundances are compatible with an α-enhanced solar-like pattern with [Ca/Fe] = 0.4 ± 0.2, Mg/Fe = 0.6 ± 0.2, [Ti/Fe] = 0.8 ± 0.2, and no significant s- or r-process enrichment, [Sr/Fe] < 0.2 and [Ba/Fe] < 1.0...[Show more]

dc.contributor.authorNordlander, Thomas
dc.contributor.authorBessell, Michael
dc.contributor.authorDa Costa, Gary
dc.contributor.authorMackey, Dougal
dc.contributor.authorAsplund, Martin
dc.contributor.authorCasey, A. R.
dc.contributor.authorChiti, Anirudh
dc.contributor.authorEzzeddine, Rana
dc.contributor.authorFrebel, Anna
dc.contributor.authorLind, K.
dc.contributor.authorMarino, Anna Fabiola
dc.contributor.authorMurphy, Simon
dc.contributor.authorNorris, John
dc.contributor.authorSchmidt, Brian
dc.contributor.authorYong, David
dc.date.accessioned2021-05-07T04:08:37Z
dc.date.available2021-05-07T04:08:37Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/232540
dc.description.abstractWe report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [Fe/H] = −6.2 ± 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbonenhanced, [C/Fe] = 3.9 ± 0.2, while other abundances are compatible with an α-enhanced solar-like pattern with [Ca/Fe] = 0.4 ± 0.2, Mg/Fe = 0.6 ± 0.2, [Ti/Fe] = 0.8 ± 0.2, and no significant s- or r-process enrichment, [Sr/Fe] < 0.2 and [Ba/Fe] < 1.0 (3σ limits). Population III stars exploding as fallback supernovae may explain both the strong carbon enhancement and the apparent lack of enhancement of odd-Z and neutron-capture element abundances. Grids of supernova models computed for metal-free progenitor stars yield good matches for stars of about 10 M imparting a low kinetic energy on the supernova ejecta, while models for stars more massive than roughly 20 M are incompatible with the observed abundance pattern.
dc.description.sponsorshipParts of this research were conducted by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. Research on extremely metal-poor stars has been supported in part through Australian Research Council Discovery Grant Program DP150103294 (GSDC, MSB, and BPS). ARC is supported in part by Australian Research Council Discovery Project DP160100637. ADM is supported by an Australian Research Council Future Fellowship (FT160100206). The national facility capability for SkyMapper has been funded through ARC LIEF grant LE130100104 from the Australian Research Council, awarded to the University of Sydney, the Australian National University, Swinburne University of Technology, the University of Queensland, the University of Western Australia, the University of Melbourne, Curtin University of Technology, Monash University and the Australian Astronomical Observatory.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights© 2019 The Author(s)
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectstars: abundances
dc.subjectstars: individual: SMSS J160540.18−144323.1
dc.subjectstars: Population III
dc.titleThe lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume488
dcterms.dateAccepted2019-06-27
dc.date.issued2019-06-27
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.absfor030606 - Structural Chemistry and Spectroscopy
local.identifier.absfor020199 - Astronomical and Space Sciences not elsewhere classified
local.identifier.ariespublicationu3102795xPUB4521
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationNordlander, Thomas, College of Science, ANU
local.contributor.affiliationBessell, Michael, College of Science, ANU
local.contributor.affiliationDa Costa, Gary, College of Science, ANU
local.contributor.affiliationMackey, Dougal, College of Science, ANU
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationCasey, A. R., Monash University
local.contributor.affiliationChiti, Anirudh, Massachusetts Institute of Technology
local.contributor.affiliationEzzeddine, Rana, Massachusetts Institute of Technology
local.contributor.affiliationFrebel, Anna, Massachusetts Institute of Technology
local.contributor.affiliationLind, K., Max-Planck-Institut fuer Astronomie
local.contributor.affiliationMarino, Anna, College of Science, ANU
local.contributor.affiliationMurphy, Simon, College of Science, ANU
local.contributor.affiliationNorris, John, College of Science, ANU
local.contributor.affiliationSchmidt, Brian, College of Science, ANU
local.contributor.affiliationYong, David, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/CE170100013
dc.relationhttp://purl.org/au-research/grants/arc/DP150103294
dc.relationhttp://purl.org/au-research/grants/arc/DP160100637
dc.relationhttp://purl.org/au-research/grants/arc/FT160100206
dc.relationhttp://purl.org/au-research/grants/arc/LE130100104
local.bibliographicCitation.issue1
local.bibliographicCitation.startpageL109
local.bibliographicCitation.lastpageL113
local.identifier.doi10.1093/mnrasl/slz109
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-12-27T07:25:55Z
local.identifier.thomsonIDWOS:000482696200021
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 7.5.2021)
CollectionsANU Research Publications

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