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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Metal-poor lithium-rich giants in the radial velocity experiment survey
Astrophysical Journal, Volume 743, No. 2, Article 107, Year 2011
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Description
We report the discovery of eight lithium-rich field giants found in a high-resolution spectroscopic sample of over 700 metal-poor stars ([Fe/H] < -0.5) selected from the Radial Velocity Experiment survey. The majority of the Li-rich giants in our sample are very metal-poor ([Fe/H] ≲ -1.9), and have a Li abundance (in the form of 7Li), A(Li) = log (n(Li)/n(H)) + 12, between 2.30 and 3.63, well above the typical upper red giant branch (RGB) limit, A(Li) < 0.5, while two stars, with A(Li)∼1.7-1.8, show similar lithium abundances to normal giants at the same gravity. We further included two metal-poor, Li-rich globular cluster giants in our sample, namely the previously discovered M3-IV101 and newly discovered (in this work) M68-A96. This comprises the largest sample of metal-poor Li-rich giants to date. We performed a detailed abundance analysis of all stars, finding that the majority of our sample stars have elemental abundances similar to that of Li-normal halo giants. Although the evolutionary phase of each Li-rich giant cannot be definitively determined, the Li-rich phase is likely connected to extra mixing at the RGB bump or early asymptotic giant branch that triggers cool bottom processing in which the bottom of the outer convective envelope is connected to the H-burning shell in the star. The surface of a star becomes Li-enhanced as 7Be (which burns to 7Li) is transported to the stellar surface via the Cameron-Fowler mechanism. We discuss and discriminate among several models for the extra mixing that can cause Li production, given the detailed abundances of the Li-rich giants in our sample. © 2011. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Ruchti, Gregory R.
United States, Baltimore
Johns Hopkins University
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Fulbright, Jon P.
United States, Baltimore
Johns Hopkins University
Wyse, Rosemary F.G.
United States, Baltimore
Johns Hopkins University
Gilmore, Gerard F.
United Kingdom, Cambridge
Institute of Astronomy
Saudi Arabia, Jeddah
King Abdulaziz University
Grebel, Eva K.
Germany, Heidelberg
Astronomisches Rechen-institut
Bienaymé, Olivier
France, Strasbourg
Observatoire Astronomique de Strasbourg
Bland-Hawthorn, Joss
Australia, Sydney
The University of Sydney
Freeman, Kenneth C.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Gibson, Brad K.
United Kingdom, Preston
University of Central Lancashire
Canada, Halifax
Saint Mary's University
Munari, Ulisse
Italy, Padua
Osservatorio Astronomico Di Padova
Navarro, Julio F.
Canada, Victoria
University of Victoria
Parker, Quentin A.
Australia
Australian Astronomical Observatory
Australia, Sydney
Macquarie University
Reid, Warrenk A.
Australia, Sydney
Macquarie University
Seabroke, George M.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Siebert, Arnaud
France, Strasbourg
Observatoire Astronomique de Strasbourg
Siviero, Alessandro
Italy, Padua
Università Degli Studi Di Padova
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Steinmetz, Matthias
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Watson, Frederick G.
Australia
Australian Astronomical Observatory
Williams, Mary E.K.
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Zwitter, Tomaž
Slovenia, Ljubljana
Univerza V Ljubljani
Slovenia, Ljubljana
Center of Excellence Space-si
Statistics
Citations: 49
Authors: 20
Affiliations: 19
Identifiers
Doi:
10.1088/0004-637X/743/2/107
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Violence And Injury
Study Design
Cross Sectional Study
Study Approach
Quantitative