A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851

David Yong; Frank Grundahl; Francesca D'Antona; Amanda Irene Karakas; John Charles Lattanzio; John Edward Norris

A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851

David Yong, Frank Grundahl, Francesca D'Antona, Amanda Irene Karakas, John Charles Lattanzio, John Edward Norris

School of Mathematics

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

103 Citations (Scopus)

Abstract

Abundances of C, N, and O are determined in four bright red giants that span the known abundance range for light (Na and Al) and s-process (Zr and La) elements in the globular cluster NGC 1851. The abundance sum C+N+O exhibits a range of 0.6 dex, a factor of 4, in contrast to other clusters in which no significant C+N+O spread is found. Such an abundance range offers support for the Cassisi et al. scenario in which the double subgiant branch populations are coeval but with different mixtures of C+N+O abundances. Further, the Na, Al, Zr, and La abundances are correlated with C+N+O, and therefore NGC 1851 is the first cluster to provide strong support for the scenario in which asymptotic giant branch stars are responsible for the globular cluster light element abundance variations.

Original language	English
Pages (from-to)	62 - 66
Number of pages	5
Journal	The Astrophysical Journal
Volume	695
Issue number	1
Publication status	Published - 2009

Cite this

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title = "A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851",

abstract = "Abundances of C, N, and O are determined in four bright red giants that span the known abundance range for light (Na and Al) and s-process (Zr and La) elements in the globular cluster NGC 1851. The abundance sum C+N+O exhibits a range of 0.6 dex, a factor of 4, in contrast to other clusters in which no significant C+N+O spread is found. Such an abundance range offers support for the Cassisi et al. scenario in which the double subgiant branch populations are coeval but with different mixtures of C+N+O abundances. Further, the Na, Al, Zr, and La abundances are correlated with C+N+O, and therefore NGC 1851 is the first cluster to provide strong support for the scenario in which asymptotic giant branch stars are responsible for the globular cluster light element abundance variations.",

author = "David Yong and Frank Grundahl and Francesca D'Antona and Karakas, {Amanda Irene} and Lattanzio, {John Charles} and Norris, {John Edward}",

year = "2009",

language = "English",

volume = "695",

pages = "62 -- 66",

journal = "The Astrophysical Journal",

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T1 - A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851

AU - Yong, David

AU - Grundahl, Frank

AU - D'Antona, Francesca

AU - Karakas, Amanda Irene

AU - Lattanzio, John Charles

AU - Norris, John Edward

PY - 2009

Y1 - 2009

N2 - Abundances of C, N, and O are determined in four bright red giants that span the known abundance range for light (Na and Al) and s-process (Zr and La) elements in the globular cluster NGC 1851. The abundance sum C+N+O exhibits a range of 0.6 dex, a factor of 4, in contrast to other clusters in which no significant C+N+O spread is found. Such an abundance range offers support for the Cassisi et al. scenario in which the double subgiant branch populations are coeval but with different mixtures of C+N+O abundances. Further, the Na, Al, Zr, and La abundances are correlated with C+N+O, and therefore NGC 1851 is the first cluster to provide strong support for the scenario in which asymptotic giant branch stars are responsible for the globular cluster light element abundance variations.

AB - Abundances of C, N, and O are determined in four bright red giants that span the known abundance range for light (Na and Al) and s-process (Zr and La) elements in the globular cluster NGC 1851. The abundance sum C+N+O exhibits a range of 0.6 dex, a factor of 4, in contrast to other clusters in which no significant C+N+O spread is found. Such an abundance range offers support for the Cassisi et al. scenario in which the double subgiant branch populations are coeval but with different mixtures of C+N+O abundances. Further, the Na, Al, Zr, and La abundances are correlated with C+N+O, and therefore NGC 1851 is the first cluster to provide strong support for the scenario in which asymptotic giant branch stars are responsible for the globular cluster light element abundance variations.

UR - http://www.iop.org/EJ/article/1538-4357/695/1/L62/apjl_695_1_62.pdf

M3 - Article

SN - 0004-637X

VL - 695

SP - 62

EP - 66

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851

Abstract

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