Precise Li abundances in metal-poor stars: depletion in the Spite plateau

Jorge Melendez; Luca Casagrande; I Ramirez; Martin Asplund

doi:10.1017/S1743921310000220

Precise Li abundances in metal-poor stars: depletion in the Spite plateau

Jorge Melendez, Luca Casagrande, I Ramirez, Martin Asplund

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We present Li abundances for 73 stars in the metallicity range âˆ’3.5 < [Fe/H] < âˆ’1.0 using improved IRFM temperatures (Casagrande et al. 2009) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths (ÏƒEW ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN.

Original language	English
Title of host publication	Chemical Abundances in the Universe: Connecting First Stars to Planets
Editors	K Cunha, M Spite, B Barbuy
Place of Publication	Cambridge
Publisher	Cambridge University Press
Pages	71-72
ISBN (Print)	9780521764957
DOIs	https://doi.org/10.1017/S1743921310000220
Publication status	Published - 2010
Event	Chemical Abundances in the Universe: Connecting First Stars to Planets - Rio de Janeiro, Brazil, Brazil Duration: 1 Jan 2010 → … http://journals.cambridge.org/action/displayIssue?jid=IAU&volumeId=5&seriesId=0&issueId=S265

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Name
Number	265

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Conference	Chemical Abundances in the Universe: Connecting First Stars to Planets
Country/Territory	Brazil
Period	1/01/10 → …
Other	10-14 Aug 2009
Internet address	http://journals.cambridge.org/action/displayIssue?jid=IAU&volumeId=5&seriesId=0&issueId=S265

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@inproceedings{76dfb6970b2a46f09c8f78c9fcaf93de,

title = "Precise Li abundances in metal-poor stars: depletion in the Spite plateau",

abstract = "We present Li abundances for 73 stars in the metallicity range {\^a}ˆ{\textquoteright}3.5 < [Fe/H] < {\^a}ˆ{\textquoteright}1.0 using improved IRFM temperatures (Casagrande et al. 2009) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths ({\"I}ƒEW ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN.",

author = "Jorge Melendez and Luca Casagrande and I Ramirez and Martin Asplund",

note = "c International Astronomical Union 2010; Chemical Abundances in the Universe: Connecting First Stars to Planets ; Conference date: 01-01-2010",

year = "2010",

doi = "10.1017/S1743921310000220",

language = "English",

isbn = "9780521764957",

publisher = "Cambridge University Press",

number = "265",

pages = "71--72",

editor = "{K Cunha, M Spite, B Barbuy}",

booktitle = "Chemical Abundances in the Universe: Connecting First Stars to Planets",

url = "http://journals.cambridge.org/action/displayIssue?jid=IAU&volumeId=5&seriesId=0&issueId=S265",

}

Melendez, J, Casagrande, L, Ramirez, I & Asplund, M 2010, Precise Li abundances in metal-poor stars: depletion in the Spite plateau. in KCMSBB (ed.), Chemical Abundances in the Universe: Connecting First Stars to Planets. Cambridge University Press, Cambridge, pp. 71-72, Chemical Abundances in the Universe: Connecting First Stars to Planets, Brazil, 1/01/10. https://doi.org/10.1017/S1743921310000220

Precise Li abundances in metal-poor stars: depletion in the Spite plateau. / Melendez, Jorge; Casagrande, Luca; Ramirez, I et al.
Chemical Abundances in the Universe: Connecting First Stars to Planets. ed. / K Cunha, M Spite, B Barbuy. Cambridge: Cambridge University Press, 2010. p. 71-72.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Precise Li abundances in metal-poor stars: depletion in the Spite plateau

AU - Melendez, Jorge

AU - Casagrande, Luca

AU - Ramirez, I

AU - Asplund, Martin

N1 - c International Astronomical Union 2010

PY - 2010

Y1 - 2010

N2 - We present Li abundances for 73 stars in the metallicity range âˆ’3.5 < [Fe/H] < âˆ’1.0 using improved IRFM temperatures (Casagrande et al. 2009) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths (ÏƒEW ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN.

AB - We present Li abundances for 73 stars in the metallicity range âˆ’3.5 < [Fe/H] < âˆ’1.0 using improved IRFM temperatures (Casagrande et al. 2009) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths (ÏƒEW ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN.

U2 - 10.1017/S1743921310000220

DO - 10.1017/S1743921310000220

M3 - Conference contribution

SN - 9780521764957

SP - 71

EP - 72

BT - Chemical Abundances in the Universe: Connecting First Stars to Planets

A2 - null, K Cunha, M Spite, B Barbuy

PB - Cambridge University Press

CY - Cambridge

T2 - Chemical Abundances in the Universe: Connecting First Stars to Planets

Y2 - 1 January 2010

ER -

Precise Li abundances in metal-poor stars: depletion in the Spite plateau

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