An Ultra Metal-poor Star Near the Hydrogen-burning Limit

@article{Schlaufman2018AnUM,
  title={An Ultra Metal-poor Star Near the Hydrogen-burning Limit},
  author={Kevin C. Schlaufman and Ian B. Thompson and Andrew R. Casey},
  journal={The Astrophysical Journal},
  year={2018}
}
It is unknown whether or not low-mass stars can form at low metallicity. While theoretical simulations of Population III (Pop III) star formation show that protostellar disks can fragment, it is impossible for those simulations to discern if those fragments survive as low-mass stars. We report the discovery of a low-mass star on a circular orbit with orbital period P = 34.757 +/- 0.010 days in the ultra metal-poor (UMP) single-lined spectroscopic binary system 2MASS J18082002--5104378. The… Expand

Figures and Tables from this paper

High-speed stars: Galactic hitchhikers
Context. The search for stars born in the very early stages of the Milky Way star formation history is of paramount importance in the study of the early Universe since their chemistry carriesExpand
Tracing the formation of the Milky Way through ultra metal-poor stars
We use Gaia DR2 astrometric and photometric data, published radial velocities and MESA models to infer distances, orbits, surface gravities, and effective temperatures for all ultra metal-poor starsExpand
Binarity among CEMP-no stars: an indication of multiple formation pathways?
Carbon-enhanced metal-poor (CEMP) stars comprise a high percentage of stars at the lowest metallicities. The stars in the CEMP-no subcategory do not show any s-process enhancement and thereforeExpand
Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: the Be–O correlation
Context. Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles. Aims. We investigate the BeExpand
The Pristine survey – V. A bright star sample observed with SOPHIE
With the aim of probing the properties of the bright end of the Pristine survey and its effectiveness in selecting metal-poor stars, we selected a sample of bright candidate metal-poor starsExpand
The local and distant Universe: stellar ages and H0
The ages of the oldest stellar objects in our galaxy provide an independent test of the current cosmological model as they give a lower limit to the age of the Universe. Recent accurate parallaxes byExpand
Toward a concordance teleparallel cosmology. Part I. Background dynamics
Assuming a spatially flat universe, we study the cosmological viability of an infrared corrected teleparallel gravity model, which accounts for late acceleration by weakening gravity at later timesExpand
Planck evidence for a closed Universe and a possible crisis for cosmology
The recent Planck Legacy 2018 release has confirmed the presence of an enhanced lensing amplitude in cosmic microwave background power spectra compared with that predicted in the standard Λ cold darkExpand
Lagrangian density and local symmetries of inhomogeneous hyperconical universes
Hyperconical universes can be represented by means of an inhomogeneous metric with positive curvature and linear expansion, that is isomorph to flat universes with acceleration thanks to anExpand
Gravitational waves in a closed spacetime via deviation equation
Gravitational Waves in a Closed Spacetime via Deviation Equation Jafar Khodagholizadeh 1∗, Amir H. Abbassi 2†, Ali Vahedi3‡ and K. Babaei 1§ 1 Farhangian University, P.O. Box 11876-13311, Tehran,Expand
...
1
2
3
...

References

SHOWING 1-10 OF 152 REFERENCES
Limits on Population III star formation with the most iron-poor stars
We study the impact of star-forming minihaloes, and the initial mass function (IMF) of Population III (Pop III) stars, on the Galactic halo metallicity distribution function (MDF) and on theExpand
Blocking metal accretion onto population III stars by stellar wind
Low-mass population III (PopIII) stars of $\lesssim 0.8 M_{\odot}$ could survive up until the present. Non-detection of low-mass PopIII stars in our Galaxy has already put a stringent constraint onExpand
An extremely primitive halo star
The early Universe had a chemical composition consisting of hydrogen, helium and traces of lithium1, almost all other elements were created in stars and supernovae. The mass fraction, Z, of elementsExpand
The role of binaries in the enrichment of the early Galactic halo I. r-process-enhanced metal-poor stars
Context. The detailed chemical composition of most metal-poor halo stars has been found to be highly uniform, but a minority of stars exhibit dramatic enhancements in their abundances of heavyExpand
The Initial mass function of the first stars inferred from extremely metal-poor stars
We compare elemental abundance patterns of $\sim 200$ extremely metal-poor (EMP; [Fe/H]$<-3$) stars with supernova yields of metal-free stars in order to obtain insights into the characteristicExpand
The first low‐mass stars: critical metallicity or dust‐to‐gas ratio?
We explore the minimal conditions which enable the formation of metal-enriched solar and subsolar-mass stars. Using a one-zone semi-analytical model, we accurately follow the chemical and thermalExpand
The chemical signature of surviving Population III stars in the Milky Way
Cosmological simulations of Population (Pop) III star formation suggest that the primordial initial mass function may have extended to sub-solar masses. If Pop III stars with masses < 0.8 M_Sun didExpand
The First Stars: A Low-Mass Formation Mode
We perform numerical simulations of the growth of a Population III stellar system under photodissociating feedback. We start from cosmological initial conditions at z = 100, self-consistentlyExpand
The First Stellar Cluster
We report results from numerical simulations of star formation in the early universe that focus on gas at very high densities and very low metallicities. We argue that the gas in the central regionsExpand
A primordial star in the heart of the Lion
Context: The discovery and chemical analysis of extremely metal-poor stars permit a better understanding of the star formation of the first generation of stars and of the Universe emerging from theExpand
...
1
2
3
4
5
...