The abundance spread in the boötes i dwarf spheroidal galaxy

John E. Norris; Gerard Gilmore; Rosemary F.G. Wyse; Mark I. Wilkinson; V. Belokurov; N. Wyn Evans; Daniel B. Zucker

doi:10.1086/595962

The abundance spread in the boötes i dwarf spheroidal galaxy

John E. Norris, Gerard Gilmore, Rosemary F.G. Wyse, Mark I. Wilkinson, V. Belokurov, N. Wyn Evans, Daniel B. Zucker

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59 Citations (Scopus)

Abstract

We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Bootes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca ii K line. Assuming [Ca/Fe]-0.3, the abundance range in the sample is Δ[Fe/H]-1.7 dex, with one star having [Fe/H]=-3.4. The dispersion is σ([Fe/H])=0.45 ± 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (⊙≥10⁷ M&o) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

Original language	English
Pages (from-to)	L113-L116
Journal	Astrophysical Journal
Volume	689
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/595962
Publication status	Published - 2008

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title = "The abundance spread in the bo{\"o}tes i dwarf spheroidal galaxy",

abstract = "We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Bootes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca ii K line. Assuming [Ca/Fe]-0.3, the abundance range in the sample is Δ[Fe/H]-1.7 dex, with one star having [Fe/H]=-3.4. The dispersion is σ([Fe/H])=0.45 ± 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (⊙≥107 M&o) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Bo{\"o}tes I.",

keywords = "Galaxies: Abundances, Galaxies: Dwarf, Galaxies: Individual (Bo{\"o}tes I)",

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doi = "10.1086/595962",

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TY - JOUR

T1 - The abundance spread in the boötes i dwarf spheroidal galaxy

AU - Norris, John E.

AU - Gilmore, Gerard

AU - Wyse, Rosemary F.G.

AU - Wilkinson, Mark I.

AU - Belokurov, V.

AU - Evans, N. Wyn

AU - Zucker, Daniel B.

PY - 2008

Y1 - 2008

N2 - We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Bootes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca ii K line. Assuming [Ca/Fe]-0.3, the abundance range in the sample is Δ[Fe/H]-1.7 dex, with one star having [Fe/H]=-3.4. The dispersion is σ([Fe/H])=0.45 ± 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (⊙≥107 M&o) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

AB - We present medium-resolution spectra of 16 radial velocity red-giant members of the low-luminosity Bootes I dwarf spheroidal (dSph) galaxy that have sufficient S/N for abundance determination, based on the strength of the Ca ii K line. Assuming [Ca/Fe]-0.3, the abundance range in the sample is Δ[Fe/H]-1.7 dex, with one star having [Fe/H]=-3.4. The dispersion is σ([Fe/H])=0.45 ± 0.08-similar to those of the Galaxy's more luminous dSph systems and ω Centauri. This suggests that the large mass (⊙≥107 M&o) normally assumed to foster self-enrichment and the production of chemical abundance spreads was provided by the nonbaryonic material in Boötes I.

KW - Galaxies: Abundances

KW - Galaxies: Dwarf

KW - Galaxies: Individual (Boötes I)

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U2 - 10.1086/595962

DO - 10.1086/595962

M3 - Article

SN - 0004-637X

VL - 689

SP - L113-L116

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

The abundance spread in the boötes i dwarf spheroidal galaxy

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