Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043: A new class of extremely metal poor stars with excesses of magnesium and silicon

Wako Aoki; John E. Norris; Sean G. Ryan; Timothy C. Beers; Hiroyasu Ando

doi:10.1086/343761

Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043: A new class of extremely metal poor stars with excesses of magnesium and silicon

Wako Aoki^*, John E. Norris, Sean G. Ryan, Timothy C. Beers, Hiroyasu Ando

^*Corresponding author for this work

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

85 Citations (Scopus)

Abstract

We analyze a high-resolution, high signal-to-noise ratio spectrum of the carbon-rich, extremely metal poor star CS 29498-043, obtained with the Subaru Telescope High Dispersion Spectrograph. We find its iron abundance is extremely low ([Fe/H] = -3.7), placing it among the few stars known with [Fe/H] ≤ -3.5, while Mg and Si are significantly overabundant ([Mg/Fe] = +1.8 and [Si/Fe] = +1.1) compared with stars of similar metallicity without carbon excess. Overabundances of N and Al were also found. These characteristics are similar to the carbon-rich, extremely metal poor star CS 22949-037. Although the sample is small, our discovery of CS 29498-043 suggests the existence of a class of extremely metal poor stars with large excesses of C, N, Mg, and Si.

Original language	English
Pages (from-to)	L141-L144
Journal	Astrophysical Journal
Volume	576
Issue number	2 II
DOIs	https://doi.org/10.1086/343761
Publication status	Published - 10 Sept 2002

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@article{3fda46d5a7fe4ee299fd0fdda8258401,

title = "Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043: A new class of extremely metal poor stars with excesses of magnesium and silicon",

abstract = "We analyze a high-resolution, high signal-to-noise ratio spectrum of the carbon-rich, extremely metal poor star CS 29498-043, obtained with the Subaru Telescope High Dispersion Spectrograph. We find its iron abundance is extremely low ([Fe/H] = -3.7), placing it among the few stars known with [Fe/H] ≤ -3.5, while Mg and Si are significantly overabundant ([Mg/Fe] = +1.8 and [Si/Fe] = +1.1) compared with stars of similar metallicity without carbon excess. Overabundances of N and Al were also found. These characteristics are similar to the carbon-rich, extremely metal poor star CS 22949-037. Although the sample is small, our discovery of CS 29498-043 suggests the existence of a class of extremely metal poor stars with large excesses of C, N, Mg, and Si.",

keywords = "Nuclear reactions, nucleosynthesis, abundances, Stars: Population II, Stars: abundances, Stars: carbon, Stars: individual (CS 29498-043)",

author = "Wako Aoki and Norris, {John E.} and Ryan, {Sean G.} and Beers, {Timothy C.} and Hiroyasu Ando",

year = "2002",

month = sep,

day = "10",

doi = "10.1086/343761",

language = "English",

volume = "576",

pages = "L141--L144",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043

T2 - A new class of extremely metal poor stars with excesses of magnesium and silicon

AU - Aoki, Wako

AU - Norris, John E.

AU - Ryan, Sean G.

AU - Beers, Timothy C.

AU - Ando, Hiroyasu

PY - 2002/9/10

Y1 - 2002/9/10

N2 - We analyze a high-resolution, high signal-to-noise ratio spectrum of the carbon-rich, extremely metal poor star CS 29498-043, obtained with the Subaru Telescope High Dispersion Spectrograph. We find its iron abundance is extremely low ([Fe/H] = -3.7), placing it among the few stars known with [Fe/H] ≤ -3.5, while Mg and Si are significantly overabundant ([Mg/Fe] = +1.8 and [Si/Fe] = +1.1) compared with stars of similar metallicity without carbon excess. Overabundances of N and Al were also found. These characteristics are similar to the carbon-rich, extremely metal poor star CS 22949-037. Although the sample is small, our discovery of CS 29498-043 suggests the existence of a class of extremely metal poor stars with large excesses of C, N, Mg, and Si.

AB - We analyze a high-resolution, high signal-to-noise ratio spectrum of the carbon-rich, extremely metal poor star CS 29498-043, obtained with the Subaru Telescope High Dispersion Spectrograph. We find its iron abundance is extremely low ([Fe/H] = -3.7), placing it among the few stars known with [Fe/H] ≤ -3.5, while Mg and Si are significantly overabundant ([Mg/Fe] = +1.8 and [Si/Fe] = +1.1) compared with stars of similar metallicity without carbon excess. Overabundances of N and Al were also found. These characteristics are similar to the carbon-rich, extremely metal poor star CS 22949-037. Although the sample is small, our discovery of CS 29498-043 suggests the existence of a class of extremely metal poor stars with large excesses of C, N, Mg, and Si.

KW - Nuclear reactions, nucleosynthesis, abundances

KW - Stars: Population II

KW - Stars: abundances

KW - Stars: carbon

KW - Stars: individual (CS 29498-043)

UR - http://www.scopus.com/inward/record.url?scp=0000523341&partnerID=8YFLogxK

U2 - 10.1086/343761

DO - 10.1086/343761

M3 - Article

SN - 0004-637X

VL - 576

SP - L141-L144

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

Chemical composition of the carbon-rich, extremely metal poor star CS 29498-043: A new class of extremely metal poor stars with excesses of magnesium and silicon

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