Observation of interstellar lithium in the low-metallicity Small Magellanic Cloud

@article{Howk2012ObservationOI,
  title={Observation of interstellar lithium in the low-metallicity Small Magellanic Cloud},
  author={J. Howk and N. Lehner and B. Fields and G. Mathews},
  journal={Nature},
  year={2012},
  volume={489},
  pages={121-123}
}
The primordial abundances of light elements produced in the standard theory of Big Bang nucleosynthesis (BBN) depend only on the cosmic ratio of baryons to photons, a quantity inferred from observations of the microwave background. The predicted primordial 7Li abundance is four times that measured in the atmospheres of Galactic halo stars. This discrepancy could be caused by modification of surface lithium abundances during the stars’ lifetimes or by physics beyond the Standard Model that… Expand
Galactic fly-bys: New source of lithium production
Observations of low-metallicity halo stars have revealed a puzzling result: the abundance of \li7 in these stars is at least three times lower than their predicted primordial abundance. It is unclearExpand
Galactic cosmic-ray induced production of lithium in the Small Magellanic Cloud
Abstract Recently, the first lithium detection outside of the Milky Way was made in low-metallicity gas of the Small Magellanic Cloud, which was at the level of the expected primordial value. Part ofExpand
Cosmology: The lithium problem
TLDR
The detection of interstellar lithium beyond the Milky Way, in the low-metallicity gas of the nearby Small Magellanic Cloud galaxy, shows that present-day lithium-7 abundance in this galaxy is nearly equal to the predictions of the standard theory of Big Bang nucleosynthesis — although the data can also be reconciled with non-standard models. Expand
Lithium abundance in the metal-poor open cluster NGC 2243
Context. Lithium is a fundamental element for studying the mixing mechanisms acting in the stellar interiors, for understanding the chemical evolution of the Galaxy and the Big Bang nucleosynthesis.Expand
Lithium and beryllium in the Gaia-Enceladus galaxy
Data from Gaia DR2 and APOGEE surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a disrupted dwarf galaxy named Gaia-Enceladus thatExpand
Standard big bang nucleosynthesis and primordial CNO abundances after Planck
Primordial or big bang nucleosynthesis (BBN) is one of the three historical strong evidences for the big bang model. The recent results by the Planck satellite mission have slightly changed theExpand
Precision big bang nucleosynthesis with improved Helium-4 predictions
Primordial nucleosynthesis is one of the three historical evidences for the big bang model, together with the expansion of the universe and the cosmic microwave background. Now that the number ofExpand
Cosmic-Ray Nucleosynthesis in Galactic Interactions
It has been shown that galactic interactions and mergers can result in large-scale tidal shocks that propagate through interstellar gas. As a result, this can give rise to a new population of cosmicExpand
The Dawn of Chemistry
Within the precise cosmological framework provided by the Λ-cold dark matter model and standard Big Bang nucleosynthesis, the chemical evolution of the pregalactic gas can now be followed withExpand
Frontiers in Nuclear Astrophysics
The synthesis of nuclei in diverse cosmic scenarios is reviewed, with a summary of the basic concepts involved before a discussion of the current status in each case is made. We review the physics ofExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 86 REFERENCES
Probing Primordial and Pre-Galactic Lithium with High-Velocity Clouds
The pre-Galactic abundance of lithium offers a unique window into nonthermal cosmological processes. The primordial Li abundance is guaranteed to be present and probes big bang nucleosynthesis (BBN),Expand
A probable stellar solution to the cosmological lithium discrepancy
TLDR
Spectroscopic observations of stars in the metal-poor globular cluster NGC 6397 reveal trends of atmospheric abundance with evolutionary stage for various elements that are reproduced by stellar-evolution models with diffusion and turbulent mixing and conclude that diffusion is predominantly responsible for the low apparent stellar lithium abundance in the atmospheres of old stars. Expand
Newly synthesized lithium in the interstellar medium
TLDR
Observations of 7Li and 6Li abundances in several interstellar clouds lying in the direction of the star Persei find the abundance ratio 7Li/6Li to be about 2, which is significantly lower than the average Solar System value of 12.3. Expand
Galactic chemical evolution with low and high primordial lithium
We discuss two scenarios for the galactic chemical evolution of lithium. In one, the primordial 7Li abundance is taken to be that presently observed in Population II stars. This value is subsequentlyExpand
Cosmic-Ray Production of 6Li by Structure Formation Shocks in the Early Milky Way: A Fossil Record of Dissipative Processes during Galaxy Formation
While the abundances of Be and B observed in metal-poor halo stars are well explained as resulting from spallation of CNO-enriched cosmic rays (CRs) accelerated by supernova shocks, accounting forExpand
Lithium abundance at the formation of the Galaxy
The observed abundance of lithium in population I stars (young stars)1 seems to have been stable during the past 5 × 109 yr (ref. 2). This stability has been used previously1,3 to estimate theExpand
The VLT-FLAMES survey of massive stars: evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
We present an analysis of high resolution VLT-FLAMES spectra of 61 B-type stars with relatively narrow-lined spectra lo cated in 4 fields centered on the Milky Way clusters; NGC3293 & NGC4755 and theExpand
INTERSTELLAR ABUNDANCES FROM ABSORPTION-LINE OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE
▪ Abstract The Goddard High-Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope (HST) has yielded precision abundance results for a range of interstellar environments, including gas inExpand
Chemical abundances from Magellanic cloud B stars
In recent years, B stars have been established as reliable tracers of present day abundance patterns. They yield an independent set of abundances from He to Fe which can be cross-checked againstExpand
The VLT-FLAMES survey of massive stars: constraints on stellar evolution from the chemical compositions of rapidly rotating Galactic and Magellanic Cloud B-type stars
Aims. We have previously analysed the spectra of 135 early B-type stars in the Large Magellanic Cloud (LMC) and found several groups of stars that have chemical compositions that conflict with theExpand
...
1
2
3
4
5
...