J/A+A/624/A44ivo://CDS.VizieR/J/A+A/624/A44doi:10.26093/cds/vizier.36240044CDSSpite M.Bonifacio P.Spite F.Caffau E.Sbordone L.Gallagher A.J.2019-04-08T14:46:47Z2019-04-05T08:46:21ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmilky-way-galaxychemically-peculiar-starschemical-abundancesMeasurable 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 (S/N) UV spectra were acquired at ESO with the Kueyen 8.2m 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 9Be. 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.2019A&A...624A..44Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/624/A44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/743/140 : Abundances (Be,{alpha}) in metal-poor stars (Boesgaard+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/624/A44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/624/A44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/624/A44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/624/A44https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/624/A44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/624/A44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/624/A44/oxy (*3D-corrected oxygen abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/624/A44/oxy?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/624/A44/oxy?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/624/A44/oxy?GETtext/xml+votable180.050000true33.6679133-1.20142330.0055555555555555566/146 208 373 798 800 1911 2133 4184 4376 4714 5111 5113 5413 5622 5827 6159 6186 6256 6348 6792 7117 7334 8210 8999 9505 9831 10247 10359 10972 11419 12295 12332 12424 12451 12621 12645 12650 12704 12793 13028 13075 13478 14298 14385 14534 14743 16935 17124 17136 17509 17726 18193 18198 18887 19100 19347 19903 21287 21608 21806 21866 22093 22594 23011 23015 23070 23705 23785 23978 25385 25554 25573 25891 26025 26284 26289 26576 27330 27659 27857 27948 28154 28336 29593 29596 29753 30042 30051 30179 30296 30359 30464 30577 30907 31094 31748 32034 32343 32593 32743 34684 36139 36474 36729 36745 36780 36813 36840 40567 40716 40944 44281 44542 48719 48937https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/624/A44?format=asciidefaultJ/A+A/624/A44/oxy*3D-corrected oxygen abundancesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectivefloatlogglogarithm of the gravity in the atmospherelog(cm.s**-2)phys.gravityfloat[M/H]Metallicityphys.abund.ZfloatA(Be)log(N(Be)/N(N(H))+12phys.abundfloat[O/H]1D1D value of [O/H]phys.abundfloatCor3D3D correctionarith.factorfloat[O/H]3DAbundance [O/H] corrected for 3D effectsphys.abundfloatB11Display the data of Boesgaard et al. (2011, Cat. J/ApJ/743/140)meta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main