Effective temperatures and lithium abundances of halo turnoff stars

P. E. Nissen; C. Akerman; M. Asplund; D. Fabbian; M. Pettini

doi:10.1017/S1743921305005351

Effective temperatures and lithium abundances of halo turnoff stars

P. E. Nissen, C. Akerman, M. Asplund, D. Fabbian, M. Pettini

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Abstract

Effective temperatures of 30 turnoff stars with -3.2 < [Fe/H] < -1.5 have been derived from the profiles of Balmer lines in high S/N, VLT/UVES spectra. While the systematic error of T_eff may be of the order of 100 K, the differential values of T_eff are determined with a one-sigma precision of ∼25K. These precise T_eff values are used in a study of the slope and dispersion of the Li abundance as a function of [Fe/H]. A small, but significant cosmic dispersion in A (Li) appears to be present exemplified by the two very metal-poor stars G64-12 and G64-37.

Original language	English
Pages (from-to)	101-102
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	1
Issue number	S228
DOIs	https://doi.org/10.1017/S1743921305005351
Publication status	Published - 2005

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10.1017/S1743921305005351

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title = "Effective temperatures and lithium abundances of halo turnoff stars",

abstract = "Effective temperatures of 30 turnoff stars with -3.2 < [Fe/H] < -1.5 have been derived from the profiles of Balmer lines in high S/N, VLT/UVES spectra. While the systematic error of Teff may be of the order of 100 K, the differential values of Teff are determined with a one-sigma precision of ∼25K. These precise Teff values are used in a study of the slope and dispersion of the Li abundance as a function of [Fe/H]. A small, but significant cosmic dispersion in A (Li) appears to be present exemplified by the two very metal-poor stars G64-12 and G64-37.",

keywords = "Cosmology: early universe, Stars: abundances, Stars: fundamental parameters",

author = "Nissen, {P. E.} and C. Akerman and M. Asplund and D. Fabbian and M. Pettini",

year = "2005",

doi = "10.1017/S1743921305005351",

language = "English",

volume = "1",

pages = "101--102",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

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TY - JOUR

T1 - Effective temperatures and lithium abundances of halo turnoff stars

AU - Nissen, P. E.

AU - Akerman, C.

AU - Asplund, M.

AU - Fabbian, D.

AU - Pettini, M.

PY - 2005

Y1 - 2005

N2 - Effective temperatures of 30 turnoff stars with -3.2 < [Fe/H] < -1.5 have been derived from the profiles of Balmer lines in high S/N, VLT/UVES spectra. While the systematic error of Teff may be of the order of 100 K, the differential values of Teff are determined with a one-sigma precision of ∼25K. These precise Teff values are used in a study of the slope and dispersion of the Li abundance as a function of [Fe/H]. A small, but significant cosmic dispersion in A (Li) appears to be present exemplified by the two very metal-poor stars G64-12 and G64-37.

AB - Effective temperatures of 30 turnoff stars with -3.2 < [Fe/H] < -1.5 have been derived from the profiles of Balmer lines in high S/N, VLT/UVES spectra. While the systematic error of Teff may be of the order of 100 K, the differential values of Teff are determined with a one-sigma precision of ∼25K. These precise Teff values are used in a study of the slope and dispersion of the Li abundance as a function of [Fe/H]. A small, but significant cosmic dispersion in A (Li) appears to be present exemplified by the two very metal-poor stars G64-12 and G64-37.

KW - Cosmology: early universe

KW - Stars: abundances

KW - Stars: fundamental parameters

UR - http://www.scopus.com/inward/record.url?scp=63549150433&partnerID=8YFLogxK

U2 - 10.1017/S1743921305005351

DO - 10.1017/S1743921305005351

M3 - Article

AN - SCOPUS:63549150433

SN - 1743-9213

VL - 1

SP - 101

EP - 102

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S228

ER -

Effective temperatures and lithium abundances of halo turnoff stars

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