Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans
@article{Tafelmeyer2010ExtremelyMS, title={Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans}, author={Martin Tafelmeyer and Pascale Jablonka and Vanessa Hill and Matthew D. Shetrone and Eline Tolstoy and Michael J. Irwin and Giuseppina Battaglia and Amina Helmi and Else Starkenburg and Kim A. Venn and Tom Abel and P. François and A. Kaufer and Pierre L. North and Francesca Primas and Thomas Szeifert}, journal={Astronomy and Astrophysics}, year={2010}, volume={524}, pages={58} }
We present the results of a dedicated search for extremely metal-poor stars in the Fornax, Sculptor, and Sextans dSphs. Five stars were selected from two earlier VLT/Giraffe and HET/HRS surveys and subsequently followed up at high spectroscopic resolution with VLT/UVES. All of them turned out to have [Fe/H] less than or similar to -3 and three stars are below [Fe/H] similar to -3.5. This constitutes the first evidence that the classical dSphs Fornax and Sextans join Sculptor in containing…
Figures and Tables from this paper
107 Citations
The extremely low-metallicity tail of the Sculptor dwarf spheroidal galaxy
- Physics
- 2012
We present abundances for seven stars in the (extremely) low-metallicity tail of the Sculptor dwarf spheroidal galaxy, from spectra taken with X-shooter on the ESO VLT. Targets were selected from the…
Homogeneity in the early chemical evolution of the Sextans dwarf spheroidal galaxy
- PhysicsAstronomy & Astrophysics
- 2020
We present the high-resolution spectroscopic analysis of two new extremely metal-poor star (EMPS) candidates in the dwarf spheroidal galaxy Sextans. These targets were preselected from…
DETAILED ABUNDANCES OF TWO VERY METAL-POOR STARS IN DWARF GALAXIES
- Physics
- 2012
The most metal-poor stars in dwarf spheroidal galaxies (dSphs) can show the nucleosynthetic patterns of one or a few supernovae (SNe). These SNe could have zero metallicity, making metal-poor dSph…
THE METAL-POOR KNEE IN THE FORNAX DWARF SPHEROIDAL GALAXY
- Physics
- 2014
We present α-element abundances of Mg, Si, and Ti for a large sample of field stars in two outer fields of the Fornax dwarf spheroidal (dSph) galaxy, obtained with Very Large Telescope/GIRAFFE (R ∼…
The early days of the Sculptor dwarf spheroidal galaxy
- Physics
- 2015
We present the high-resolution spectroscopic study of five -3.9 <= [Fe/H] <= -2.5 stars in the Local Group dwarf spheroidal, Sculptor, thereby doubling the number of stars with comparable…
Zero-metallicity Hypernova Uncovered by an Ultra-metal-poor Star in the Sculptor Dwarf Spheroidal Galaxy* * Based on observations made with ESO VLT/X-SHOOTER at the La Silla Paranal observatory under program ID 0102.B-0786.
- PhysicsThe Astrophysical Journal Letters
- 2021
Although true metal-free “Population III” stars have so far escaped discovery, their nature, and that of their supernovae, is revealed in the chemical products left behind in the next generations of…
Detection of a Population of Carbon-enhanced Metal-poor Stars in the Sculptor Dwarf Spheroidal Galaxy
- Physics
- 2018
The study of the chemical abundances of metal-poor stars in dwarf galaxies provides a venue to constrain paradigms of chemical enrichment and galaxy formation. Here we present metallicity and carbon…
The formation of the Milky Way halo and its dwarf satellites; a NLTE-1D abundance analysis. II. Early chemical enrichment
- Physics
- 2017
We present the non-local thermodynamic equilibrium (NLTE) abundances of up to 10 chemical species in a sample of 59 very metal-poor (VMP, -4 < [Fe/H] < -2) stars in seven dwarf spheroidal galaxies…
CHEMICAL ABUNDANCES OF METAL-POOR RR LYRAE STARS IN THE MAGELLANIC CLOUDS
- Physics
- 2012
We present for the first time a detailed spectroscopic study of chemical element abundances of metal-poor RR Lyrae stars in the Large and Small Magellanic Cloud (LMC and SMC). Using the MagE echelle…
The star formation and chemical evolution history of the Fornax dwarf spheroidal galaxy
- Physics
- 2012
We have combined deep photometry in the B, V and I bands from CTIO/MOSAIC of the Sculptor dwarf spheroidal galaxy, going down to the oldest main sequence turn-offs, with spectroscopic metallicity…
References
SHOWING 1-10 OF 94 REFERENCES
Spectroscopic Studies of Very Metal-poor Stars with the Subaru High Dispersion Spectrograph. III. Light Neutron-Capture Elements
- Physics
- 2005
Elemental abundance measurements have been obtained for a sample of 18 very metal-poor stars using spectra obtained with the Subaru Telescope High Dispersion Spectrograph. Seventeen stars, among…
Detailed Abundances for 28 Metal-poor Stars: Stellar Relics in the Milky Way
- Physics
- 2008
We present the results of an abundance analysis for a sample of stars with –4 < [ Fe/H ] < − 2. The data were obtained with the HIRES spectrograph at Keck Observatory. The set includes 28 stars, with…
Uncovering Extremely Metal-Poor Stars in the Milky Way’s Ultrafaint Dwarf Spheroidal Satellite Galaxies
- Physics
- 2008
We present new metallicity measurements for 298 individual red giant branch stars in eight of the least luminous dwarf spheroidal galaxies (dSphs) in the Milky Way (MW) system. Our technique is based…
Extremely Metal-Poor Stars. II. Elemental Abundances and the Early Chemical Enrichment of The Galaxy
- Physics
- 1996
We have obtained high-resolution spectra of 23 very metal-poor stars and present an abundance analysis for 19 of these for elements between Mg and Eu. The sample comprises roughly equal numbers of…
Abundances In Very Metal-Poor Dwarf Stars
- Physics
- 2004
We discuss the detailed composition of 28 extremely metal-poor (EMP) dwarfs, 22 of which are from the Hamburg/ESO Survey (HES), based on Keck echelle spectra. Our sample has a median [Fe/H] of -2.7…
New Extremely Metal-Poor Stars in the Galactic Halo
- Physics
- 2008
We present a detailed abundance analysis based on high-resolution and high signal-to-noise spectra of eight extremely metal-poor (EMP) stars with [ Fe/H ] ≲ − 3.5 dex, four of which are new. Only…
First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
- Physics
- 2004
In the framework of the ESO Large Programme "First Stars", very high-quality spectra of some 70 very metal-poor dwarfs and giants were obtained with the ESO VLT and UVES spectrograph. These stars are…
A New View of the Dwarf Spheroidal Satellites of the Milky Way from VLT FLAMES: Where Are the Very Metal-poor Stars?
- Physics
- 2006
As part of the Dwarf galaxies Abundances and Radial-velocities Team (DART) program, we have measured the metallicities of a large sample of stars in four nearby dwarf spheroidal galaxies (dSph's):…
Chemical composition of extremely metal-poor stars in the Sextans dwarf spheroidal galaxy
- Physics
- 2009
Context. Individual stars in dwarf spheroidal galaxies around the Milky Way Galaxy have been studied both photometrically and spectroscopically. Extremely metal-poor stars among them are very…
BOO–1137—AN EXTREMELY METAL-POOR STAR IN THE ULTRA-FAINT DWARF SPHEROIDAL GALAXY BOÖTES I
- Physics
- 2010
We present high-resolution (R ∼ 40,000), high-signal-to-noise ratio (20–90) spectra of an extremely metal-poor giant star Boo−1137 in the “ultra-faint” dwarf spheroidal galaxy (dSph) Boötes I,…