[C/O] observations in Low-[Fe/H] halo stars

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

doi:10.1007/978-3-540-75485-5_10

[C/O] observations in Low-[Fe/H] halo stars

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

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

We have observed 15 halo stars to determine the [C/O] behaviour at low [Fe/H]. Making use of our recent non-LTE calculations, which show that the high excitation C and O lines used in previous studies in the literature are affected by very significant departures from LTE, we aim to obtain accurate [C/O] ratios down to [Fe/H]∼ -3.2, which will enable us to shed light on the possible presence of an upturn of [C/O] at low metallicities.

Original language	English
Title of host publication	Precision Spectroscopy in Astrophysics
Subtitle of host publication	Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006
Editors	Nuno C. Santos, Luca Pasquini, Martino Romaniello, Alexandre C. M. Correia
Pages	45-46
Number of pages	2
DOIs	https://doi.org/10.1007/978-3-540-75485-5_10
Publication status	Published - 2008

Publication series

Name	ESO Astrophysics Symposia
Volume	2008
ISSN (Print)	1431-2433
ISSN (Electronic)	1611-6143

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10.1007/978-3-540-75485-5_10

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Fabbian, D., Nissen, P. E., Asplund, M., Akerman, C. J., & Pettini, M. (2008). [C/O] observations in Low-[Fe/H] halo stars. In N. C. Santos, L. Pasquini, M. Romaniello, & A. C. M. Correia (Eds.), Precision Spectroscopy in Astrophysics: Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006 (pp. 45-46). (ESO Astrophysics Symposia; Vol. 2008). https://doi.org/10.1007/978-3-540-75485-5_10

@inproceedings{b52136ee76ea4306843ca0e9310e369d,

title = "[C/O] observations in Low-[Fe/H] halo stars",

abstract = "We have observed 15 halo stars to determine the [C/O] behaviour at low [Fe/H]. Making use of our recent non-LTE calculations, which show that the high excitation C and O lines used in previous studies in the literature are affected by very significant departures from LTE, we aim to obtain accurate [C/O] ratios down to [Fe/H]∼ -3.2, which will enable us to shed light on the possible presence of an upturn of [C/O] at low metallicities.",

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

year = "2008",

doi = "10.1007/978-3-540-75485-5_10",

language = "English",

isbn = "9783540754848",

series = "ESO Astrophysics Symposia",

pages = "45--46",

editor = "Santos, {Nuno C.} and Luca Pasquini and Martino Romaniello and Correia, {Alexandre C. M.}",

booktitle = "Precision Spectroscopy in Astrophysics",

}

Fabbian, D, Nissen, PE, Asplund, M, Akerman, CJ & Pettini, M 2008, [C/O] observations in Low-[Fe/H] halo stars. in NC Santos, L Pasquini, M Romaniello & ACM Correia (eds), Precision Spectroscopy in Astrophysics: Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. ESO Astrophysics Symposia, vol. 2008, pp. 45-46. https://doi.org/10.1007/978-3-540-75485-5_10

[C/O] observations in Low-[Fe/H] halo stars. / Fabbian, D.; Nissen, P. E.; Asplund, M. et al.
Precision Spectroscopy in Astrophysics: Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. ed. / Nuno C. Santos; Luca Pasquini; Martino Romaniello; Alexandre C. M. Correia. 2008. p. 45-46 (ESO Astrophysics Symposia; Vol. 2008).

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

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AU - Nissen, P. E.

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AU - Akerman, C. J.

AU - Pettini, M.

PY - 2008

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N2 - We have observed 15 halo stars to determine the [C/O] behaviour at low [Fe/H]. Making use of our recent non-LTE calculations, which show that the high excitation C and O lines used in previous studies in the literature are affected by very significant departures from LTE, we aim to obtain accurate [C/O] ratios down to [Fe/H]∼ -3.2, which will enable us to shed light on the possible presence of an upturn of [C/O] at low metallicities.

AB - We have observed 15 halo stars to determine the [C/O] behaviour at low [Fe/H]. Making use of our recent non-LTE calculations, which show that the high excitation C and O lines used in previous studies in the literature are affected by very significant departures from LTE, we aim to obtain accurate [C/O] ratios down to [Fe/H]∼ -3.2, which will enable us to shed light on the possible presence of an upturn of [C/O] at low metallicities.

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U2 - 10.1007/978-3-540-75485-5_10

DO - 10.1007/978-3-540-75485-5_10

M3 - Conference contribution

SN - 9783540754848

T3 - ESO Astrophysics Symposia

SP - 45

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BT - Precision Spectroscopy in Astrophysics

A2 - Santos, Nuno C.

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A2 - Correia, Alexandre C. M.

ER -

Fabbian D, Nissen PE, Asplund M, Akerman CJ, Pettini M. [C/O] observations in Low-[Fe/H] halo stars. In Santos NC, Pasquini L, Romaniello M, Correia ACM, editors, Precision Spectroscopy in Astrophysics: Proceedings of the ESO/Lisbon/Aveiro Conference held in Aveiro, Portugal, 11-15 September 2006. 2008. p. 45-46. (ESO Astrophysics Symposia). doi: 10.1007/978-3-540-75485-5_10

[C/O] observations in Low-[Fe/H] halo stars

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