Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS

E. Caffau; A. J. Gallagher; P. Bonifacio; M. Spite; S. Duffau; F. Spite; L. Monaco; L. Sbordone

doi:10.1051/0004-6361/201732475

Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS

E. Caffau, A. J. Gallagher, P. Bonifacio, M. Spite, S. Duffau, F. Spite, L. Monaco, L. Sbordone

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

13 Citations (Scopus)

Abstract

Aims. Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. Methods. We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance. Results. We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars. Conclusions. We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).

Original language	English
Article number	A68
Journal	Astronomy and Astrophysics
Volume	614
DOIs	https://doi.org/10.1051/0004-6361/201732475
Publication status	Published - 1 Jun 2018

Keywords

Galaxy: abundances
Galaxy: formation
Galaxy: halo
Stars: abundances
Stars: Population II

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201732475

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@article{6b64ff2b88ed4f2e991ac90d53555f1e,

title = "Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS",

abstract = "Aims. Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. Methods. We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance. Results. We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars. Conclusions. We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).",

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

author = "E. Caffau and Gallagher, {A. J.} and P. Bonifacio and M. Spite and S. Duffau and F. Spite and L. Monaco and L. Sbordone",

note = "Funding Information: Acnowledgements. This research has made use of the services of the ESO Science Archive Facility. AJG acknowledges the support of the Collaborative Research Centre SFB 881 (Heidelberg University) of the Deutsche Forschungsgemein-schaft (DFG, German Research Foundation). S.D. acknowledges support from Comit{\'e} Mixto ESO-GOBIERNO DE CHILE. Funding Information: ★★Based on observations obtained at the Gemini Observatory (processed using the Gemini IRAF package), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnolog{\'i}a e Innovaci{\'o}n Productiva (Argentina), and Minist{\'e}rio da Ci{\^e}ncia, Tecnologia e Inova{\c c}{\~a}o (Brazil). Publisher Copyright: {\textcopyright} ESO 2018.",

year = "2018",

month = jun,

day = "1",

doi = "10.1051/0004-6361/201732475",

language = "English",

volume = "614",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS

AU - Caffau, E.

AU - Gallagher, A. J.

AU - Bonifacio, P.

AU - Spite, M.

AU - Duffau, S.

AU - Spite, F.

AU - Monaco, L.

AU - Sbordone, L.

N1 - Funding Information: Acnowledgements. This research has made use of the services of the ESO Science Archive Facility. AJG acknowledges the support of the Collaborative Research Centre SFB 881 (Heidelberg University) of the Deutsche Forschungsgemein-schaft (DFG, German Research Foundation). S.D. acknowledges support from Comité Mixto ESO-GOBIERNO DE CHILE. Funding Information: ★★Based on observations obtained at the Gemini Observatory (processed using the Gemini IRAF package), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). Publisher Copyright: © ESO 2018.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Aims. Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. Methods. We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance. Results. We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars. Conclusions. We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).

AB - Aims. Carbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. Methods. We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance. Results. We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars. Conclusions. We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).

KW - Galaxy: abundances

KW - Galaxy: formation

KW - Galaxy: halo

KW - Stars: abundances

KW - Stars: Population II

UR - http://www.scopus.com/inward/record.url?scp=85048900582&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201732475

DO - 10.1051/0004-6361/201732475

M3 - Article

AN - SCOPUS:85048900582

SN - 0004-6361

VL - 614

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A68

ER -

Investigation of a sample of carbon-enhanced metal-poor stars observed with FORS and GMOS

Abstract

Keywords

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