Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: The Be-O correlation

Abstract

Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles. We investigate the Be abundance in the extremely metal-poor star 2MASS J1808-5104 ([Fe/H]=--3.84) with the aim of constraining inhomogeneities or the presence of late decaying particles. High resolution, high signal-to-noise ratio UV spectra were acquired at ESO with the Kueyen 8.2 m telescope and the UVES spectrograph. Abundances were derived using several model atmospheres and spectral synthesis code. We measured log(Be/H) = -14.3 from a spectrum synthesis of the region of the Be line. Using a conservative approach, however we adopted an upper limit two times higher, i.e. log(Be/H) < -14.0. We measured the O abundance from UV OH lines and find [O/H]=--3.46 after a 3D correction. Our observation reinforces the existing upper limit on primordial Be. There is no observational indication for a primordial production of Be. This places strong constraints on the properties of putative relic particles. This result also supports the hypothesis of a homogeneous Universe, at the time of nucleosynthesis. Surprisingly, our upper limit of the Be abundance is well below the Be measurements in stars of similar [O/H]. This may be evidence that the Be-O relation breaks down in the early Galaxy, perhaps due to the escape of spallation products from the gas clouds in which stars such as 2MASS J1808-5104 have formed.

arXiv comment9 pages, 9 Figures

References in corpus (48)

• Gaia Data Release 2. Summary of the contents and survey properties
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
• Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere
• Gaia Data Release 2: Catalogue validation
• Big Bang Nucleosynthesis Constraints on Hadronically and Electromagnetically Decaying Relic Neutral Particles
• Simulations of stellar convection with CO5BOLD
• Precision big bang nucleosynthesis with improved Helium-4 predictions
• Gaia Data Release 1: Catalogue validation
• Three-dimensional mapping of the local interstellar medium with composite data
• The metal-poor end of the Spite plateau. 1: Stellar parameters, metallicities and lithium abundances
• First stars XII. Abundances in extremely metal-poor turnoff stars,and comparison with the giants
• 3D maps of interstellar dust in the Local Arm: using $Gaia$, 2MASS and APOGEE-DR14
• The Peculiar Type II Supernova 1997 D: A Case for a Very Low 56Ni Mass
• TOPoS: II. On the bimodality of carbon abundance in CEMP stars. Implications on the early chemical evolution of galaxies
• HE 1327-2326, an unevolved star with [Fe/H]<-5.0. II. New 3D-1D corrected abundances from a VLT/UVES spectrum
• Gaia Data Release 2: Processing the spectroscopic data
• NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars
• NLTE determination of the sodium abundance in a homogeneous sample of extremely metal-poor stars
• On OH line formation and oxygen abundances in metal-poor stars
• Deriving Stellar Effective Temperatures of Metal-Poor Stars with the Excitation Potential Method
• The forbidden 1082 nm line of sulphur: the photospheric abundance of sulphur in the Sun and 3D effects
• The Diverse Origins of Neutron-Capture Elements in the Metal-Poor Star HD 94028: Possible Detection of Products of i-process Nucleosynthesis
• Beryllium in the Hyades F and G Dwarfs from Keck/HIRES Spectra
• Effective temperature determinations of late-type stars based on 3D non-LTE Balmer line formation
• BD +44 493: A Ninth Magnitude Messenger from the Early Universe; Carbon Enhanced and Beryllium Poor
• TOPoS: IV. Chemical abundances from high-resolution observations of seven EMP stars
• UVES radial velocity accuracy from asteroid observations. Implications for the fine structure constant variability
• Beryllium abundances and star formation in the halo and in the thick disk
• Beryllium and Alpha-Element Abundances in a Large Sample of Metal-Poor Stars
• Beryllium in turnoff stars of NGC6397: early Galaxy spallation, cosmochronology and cluster formation
• Line formation in solar granulation: V. Missing UV-opacity and the photospheric Be abundance
• Beryllium abundances in metal-poor stars
• An Ultra Metal-poor Star Near the Hydrogen-burning Limit
• Beryllium, Oxygen and Iron Abundances in Extremely Metal-Deficient Stars
• G64-12 and G64-37 are Carbon-Enhanced Metal-Poor Stars
• A New Model for the Evolution of Light Elements in an Inhomogeneous Galactic Halo
• Effect of Long-lived Strongly Interacting Relic Particles on Big Bang Nucleosynthesis
• An in-depth spectroscopic examination of molecular bands from 3D hydrodynamical model atmospheres I. Formation of the G-band in metal-poor dwarf stars
• Evolution of Beryllium and Boron in the Inhomogeneous Early Galaxy
• 2MASS J18082002-5104378: The brightest (V=11.9) ultra metal-poor star
• Galactic Evolution of Oxygen: OH lines in 3D hydrodynamical model atmospheres
• An in-depth spectroscopic examination of molecular bands from 3D hydrodynamical model atmospheres. II. Carbon-enhanced metal-poor 3D model atmospheres
• Beryllium abundance in turn-off stars of NGC 6752
• Early star formation in the Galaxy from beryllium and oxygen abundances
• Primordial beryllium as a big bang calorimeter
• Beryllium in Ultra-Lithium-Deficient Halo Stars - The Blue Straggler Connection
• A possible signature of non-uniform Be-αrelationships for the Galaxy

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