The slow neutron capture process at low metallicity

Amanda Karakas; Maria Lugaro; Richard Stancliffe; Carlos Rijs

The slow neutron capture process at low metallicity

Amanda Karakas
, Maria Lugaro
, Richard Stancliffe
, Carlos Rijs

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper

Abstract

We have performed calculations for the slow neutron capture process (the s process) in stellar models in the mass range 0.9 to 6 solar masses at a metallicity of [Fe/H]=âˆ’2.3. The models were computed with two different stellar evolution codes and our results were compared to the composition of the elements heavier than Fe observed in carbon-enhanced metal-poor (CEMP) stars. Our models provide an explanation for the compositions of CEMP stars showing an s-process signature (CEMP-s) but not for the composition of CEMP stars showing both s-process and rapid neutron-capture (r-process) signatures (CEMP-s/r). To explain the composition of CEMP-s/r stars we propose the existence of a s/r neutron-capture process, which may be a superposition of, or a process in-between, the classical s and r processes.

Original language	English
Title of host publication	Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Editors	W. Aoki, M. Ishigaki, T. Suda, T. Tsujimoto, N. Arimoto
Place of Publication	San Francisco
Publisher	Astronomical Society of the Pacific
Pages	35-38pp
Edition	Not Peer Reviewed
ISBN (Print)	9781583817988
Publication status	Published - 2012
Event	Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way - Shuzenji, Japan Duration: 1 Jan 2012 → … http://aspbooks.org/a/volumes/table_of_contents/?book_id=499

Conference

Conference	Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Period	1/01/12 → …
Other	16-20 May 2011
Internet address	http://aspbooks.org/a/volumes/table_of_contents/?book_id=499

Cite this

@inproceedings{bbf7ca018f4f479b994d9752bdf48b1a,

title = "The slow neutron capture process at low metallicity",

abstract = "We have performed calculations for the slow neutron capture process (the s process) in stellar models in the mass range 0.9 to 6 solar masses at a metallicity of [Fe/H]={\^a}ˆ{\textquoteright}2.3. The models were computed with two different stellar evolution codes and our results were compared to the composition of the elements heavier than Fe observed in carbon-enhanced metal-poor (CEMP) stars. Our models provide an explanation for the compositions of CEMP stars showing an s-process signature (CEMP-s) but not for the composition of CEMP stars showing both s-process and rapid neutron-capture (r-process) signatures (CEMP-s/r). To explain the composition of CEMP-s/r stars we propose the existence of a s/r neutron-capture process, which may be a superposition of, or a process in-between, the classical s and r processes.",

author = "Amanda Karakas and Maria Lugaro and Richard Stancliffe and Carlos Rijs",

year = "2012",

language = "English",

isbn = "9781583817988",

pages = "35--38pp",

editor = "\{W. Aoki, M. Ishigaki, T. Suda, T. Tsujimoto, N. Arimoto\}",

booktitle = "Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way",

publisher = "Astronomical Society of the Pacific",

edition = "Not Peer Reviewed",

note = "Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way ; Conference date: 01-01-2012",

url = "http://aspbooks.org/a/volumes/table\_of\_contents/?book\_id=499",

}

Karakas, A, Lugaro, M, Stancliffe, R & Rijs, C 2012, The slow neutron capture process at low metallicity. in WAMITSTTNA (ed.), Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way. Not Peer Reviewed edn, Astronomical Society of the Pacific, San Francisco, pp. 35-38pp, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way, 1/01/12.

The slow neutron capture process at low metallicity. / Karakas, Amanda; Lugaro, Maria; Stancliffe, Richard et al.
Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way. ed. / W. Aoki, M. Ishigaki, T. Suda, T. Tsujimoto, N. Arimoto. Not Peer Reviewed. ed. San Francisco: Astronomical Society of the Pacific, 2012. p. 35-38pp.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper

TY - GEN

T1 - The slow neutron capture process at low metallicity

AU - Karakas, Amanda

AU - Lugaro, Maria

AU - Stancliffe, Richard

AU - Rijs, Carlos

PY - 2012

Y1 - 2012

N2 - We have performed calculations for the slow neutron capture process (the s process) in stellar models in the mass range 0.9 to 6 solar masses at a metallicity of [Fe/H]=âˆ’2.3. The models were computed with two different stellar evolution codes and our results were compared to the composition of the elements heavier than Fe observed in carbon-enhanced metal-poor (CEMP) stars. Our models provide an explanation for the compositions of CEMP stars showing an s-process signature (CEMP-s) but not for the composition of CEMP stars showing both s-process and rapid neutron-capture (r-process) signatures (CEMP-s/r). To explain the composition of CEMP-s/r stars we propose the existence of a s/r neutron-capture process, which may be a superposition of, or a process in-between, the classical s and r processes.

AB - We have performed calculations for the slow neutron capture process (the s process) in stellar models in the mass range 0.9 to 6 solar masses at a metallicity of [Fe/H]=âˆ’2.3. The models were computed with two different stellar evolution codes and our results were compared to the composition of the elements heavier than Fe observed in carbon-enhanced metal-poor (CEMP) stars. Our models provide an explanation for the compositions of CEMP stars showing an s-process signature (CEMP-s) but not for the composition of CEMP stars showing both s-process and rapid neutron-capture (r-process) signatures (CEMP-s/r). To explain the composition of CEMP-s/r stars we propose the existence of a s/r neutron-capture process, which may be a superposition of, or a process in-between, the classical s and r processes.

M3 - Conference Paper

SN - 9781583817988

SP - 35

EP - 38

BT - Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way

A2 - null, W. Aoki, M. Ishigaki, T. Suda, T. Tsujimoto, N. Arimoto

PB - Astronomical Society of the Pacific

CY - San Francisco

T2 - Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way

Y2 - 1 January 2012

ER -

The slow neutron capture process at low metallicity

Abstract

Conference

Fingerprint

Cite this