Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5

W. Aoki; T. C. Beers; N. Christlieb; A. Frebel; J. E. Norris; S. Honda; M. Takada-Hidai; M. Asplund; H. Ando; S. G. Ryan; S. Tsangarides; K. Nomoto; M. Y. Fujimoto; T. Kajino; Y. Yoshii

doi:10.1017/S1743921305005545

Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5

W. Aoki^*
, T. C. Beers
, N. Christlieb
, A. Frebel
, J. E. Norris
, S. Honda
, M. Takada-Hidai
, M. Asplund
, H. Ando
, S. G. Ryan
, S. Tsangarides
, K. Nomoto
, M. Y. Fujimoto
, T. Kajino
, Y. Yoshii

^*Corresponding author for this work

National Astronomical Observatory of Japan
Michigan State University
University of Hamburg
Australian National University
Tokai University
Open University Milton Keynes
The University of Tokyo
Hokkaido University

Research output: Contribution to journal › Article › peer-review

Abstract

We present preliminary results on the chemical abundance patterns of extremely metal-poor stars obtained during an ongoing observing program with Subaru/HDS. High-resolution, high signal-to-noise spectra have been obtained for 14 stars with [Fe/H] ≲ -3. Five of them exhibit clear overabundances of carbon, a remarkable characteristic found only in the most metal-poor range. One of the carbon-rich stars, HE 1327-2326, has [Fe/H]_NLTE = -5.4, the lowest Fe abundance known. No stars with -5 < [Fe/H] < -4 have yet been found in our program, suggesting that quite different enrichment processes were responsible for stars with [Fe/H] < -5 and [Fe/H] > -4. While neutron-capture elements are deficient in most of our stars, one star (BS 16550-087) exhibits large enhancements of its light neutron-capture elements (Sr, Y and Zr), providing a strong constraint on models for the production of such elements in the very early Galaxy.

Original language	English
Pages (from-to)	195-200
Number of pages	6
Journal	Proceedings of the International Astronomical Union
Volume	1
Issue number	S228
DOIs	https://doi.org/10.1017/S1743921305005545
State	Published - 2005
Externally published	Yes

Keywords

Galaxy: halo
Stars: Population II
Stars: abundances

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10.1017/S1743921305005545

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Aoki, W., Beers, T. C., Christlieb, N., Frebel, A., Norris, J. E., Honda, S., Takada-Hidai, M., Asplund, M., Ando, H., Ryan, S. G., Tsangarides, S., Nomoto, K., Fujimoto, M. Y., Kajino, T., & Yoshii, Y. (2005). Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5. Proceedings of the International Astronomical Union, 1(S228), 195-200. https://doi.org/10.1017/S1743921305005545

@article{09d3f62c2f3841d3b7497a3631e3e04f,

title = "Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5",

abstract = "We present preliminary results on the chemical abundance patterns of extremely metal-poor stars obtained during an ongoing observing program with Subaru/HDS. High-resolution, high signal-to-noise spectra have been obtained for 14 stars with [Fe/H] ≲ -3. Five of them exhibit clear overabundances of carbon, a remarkable characteristic found only in the most metal-poor range. One of the carbon-rich stars, HE 1327-2326, has [Fe/H]NLTE = -5.4, the lowest Fe abundance known. No stars with -5 < [Fe/H] < -4 have yet been found in our program, suggesting that quite different enrichment processes were responsible for stars with [Fe/H] < -5 and [Fe/H] > -4. While neutron-capture elements are deficient in most of our stars, one star (BS 16550-087) exhibits large enhancements of its light neutron-capture elements (Sr, Y and Zr), providing a strong constraint on models for the production of such elements in the very early Galaxy.",

keywords = "Galaxy: halo, Stars: Population II, Stars: abundances",

author = "W. Aoki and Beers, \{T. C.\} and N. Christlieb and A. Frebel and Norris, \{J. E.\} and S. Honda and M. Takada-Hidai and M. Asplund and H. Ando and Ryan, \{S. G.\} and S. Tsangarides and K. Nomoto and Fujimoto, \{M. Y.\} and T. Kajino and Y. Yoshii",

year = "2005",

doi = "10.1017/S1743921305005545",

language = "英语",

volume = "1",

pages = "195--200",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

number = "S228",

}

Aoki, W, Beers, TC, Christlieb, N, Frebel, A, Norris, JE, Honda, S, Takada-Hidai, M, Asplund, M, Ando, H, Ryan, SG, Tsangarides, S, Nomoto, K, Fujimoto, MY, Kajino, T & Yoshii, Y 2005, 'Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5', Proceedings of the International Astronomical Union, vol. 1, no. S228, pp. 195-200. https://doi.org/10.1017/S1743921305005545

TY - JOUR

T1 - Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5

AU - Aoki, W.

AU - Beers, T. C.

AU - Christlieb, N.

AU - Frebel, A.

AU - Norris, J. E.

AU - Honda, S.

AU - Takada-Hidai, M.

AU - Asplund, M.

AU - Ando, H.

AU - Ryan, S. G.

AU - Tsangarides, S.

AU - Nomoto, K.

AU - Fujimoto, M. Y.

AU - Kajino, T.

AU - Yoshii, Y.

PY - 2005

Y1 - 2005

N2 - We present preliminary results on the chemical abundance patterns of extremely metal-poor stars obtained during an ongoing observing program with Subaru/HDS. High-resolution, high signal-to-noise spectra have been obtained for 14 stars with [Fe/H] ≲ -3. Five of them exhibit clear overabundances of carbon, a remarkable characteristic found only in the most metal-poor range. One of the carbon-rich stars, HE 1327-2326, has [Fe/H]NLTE = -5.4, the lowest Fe abundance known. No stars with -5 < [Fe/H] < -4 have yet been found in our program, suggesting that quite different enrichment processes were responsible for stars with [Fe/H] < -5 and [Fe/H] > -4. While neutron-capture elements are deficient in most of our stars, one star (BS 16550-087) exhibits large enhancements of its light neutron-capture elements (Sr, Y and Zr), providing a strong constraint on models for the production of such elements in the very early Galaxy.

AB - We present preliminary results on the chemical abundance patterns of extremely metal-poor stars obtained during an ongoing observing program with Subaru/HDS. High-resolution, high signal-to-noise spectra have been obtained for 14 stars with [Fe/H] ≲ -3. Five of them exhibit clear overabundances of carbon, a remarkable characteristic found only in the most metal-poor range. One of the carbon-rich stars, HE 1327-2326, has [Fe/H]NLTE = -5.4, the lowest Fe abundance known. No stars with -5 < [Fe/H] < -4 have yet been found in our program, suggesting that quite different enrichment processes were responsible for stars with [Fe/H] < -5 and [Fe/H] > -4. While neutron-capture elements are deficient in most of our stars, one star (BS 16550-087) exhibits large enhancements of its light neutron-capture elements (Sr, Y and Zr), providing a strong constraint on models for the production of such elements in the very early Galaxy.

KW - Galaxy: halo

KW - Stars: Population II

KW - Stars: abundances

UR - https://www.scopus.com/pages/publications/63549104726

U2 - 10.1017/S1743921305005545

DO - 10.1017/S1743921305005545

M3 - 文章

AN - SCOPUS:63549104726

SN - 1743-9213

VL - 1

SP - 195

EP - 200

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

IS - S228

ER -

Chemical abundance patterns of extremely metal-poor stars with [Fe/H]≲ -3.5

Abstract

Keywords

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