2003
DOI: 10.1088/1009-9271/3/4/316
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Non-LTE Analysis of the Sodium Abundance of Metal-Poor Stars in the Galactic Disk and Halo

Abstract: are discussed in comparison with the previous observational studies along with the theoretical predictions from the available chemical evolution models.

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Cited by 83 publications
(91 citation statements)
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References 41 publications
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“…The Na lines are, however, subject to NLTE effects, where the NLTE corrections are dependent on the stellar parameters, [Fe/H], and the Na abundance (e.g. Mashonkina et al 2000;Takeda et al 2003). While the cluster sample spans almost one dex in [Fe/H], we do not see an Na abundance trend with metallicity when assuming LTE.…”
Section: Data Samplesmentioning
confidence: 48%
“…The Na lines are, however, subject to NLTE effects, where the NLTE corrections are dependent on the stellar parameters, [Fe/H], and the Na abundance (e.g. Mashonkina et al 2000;Takeda et al 2003). While the cluster sample spans almost one dex in [Fe/H], we do not see an Na abundance trend with metallicity when assuming LTE.…”
Section: Data Samplesmentioning
confidence: 48%
“…The light element Na is strongly enhanced in the Her stars, with typical [Na/Fe] ratios of 0.6-0.8 dex. For stars with similar atmosphere parameters to Her-2 and 3, the calculations of Takeda et al (2003) show downward non-LTE corrections that become more severe with increasing EW for our Na i lines at 8183 and 8195 . Given the large EWs of our 8183/8195 A Na i lines, near 160-190 m , the Takeda et al results suggestÅ A abundance corrections that reduce our LTE values by 0.3-0.4 dex.…”
Section: A-and Light Elementsmentioning
confidence: 78%
“…These lines are known to suffer from strong non-LTE (NLTE) effects such that LTE abundances tend to be larger than corresponding NLTE values (Takeda et al 2003). The NLTE correction to Na abundances ranges from −0.1 dex to −0.5 dex, depending on the atmospheric parameters of stars (Takeda et al 2003 In the four higher metallicity stars in our sample, the [Ni/Fe] ratios are similar to those obtained for the field halo stars, except for one object (Boo-121). Two Ni I lines used to obtain Ni abundance in this stars both suggest a subsolar [Ni/Fe] ratio.…”
Section: Sodiummentioning
confidence: 99%