2019A&A...624A..44S


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET17:44:17

2019A&A...624A..44S - Astronomy and Astrophysics, volume 624A, 44-44 (2019/4-1)

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

SPITE M., BONIFACIO P., SPITE F., CAFFAU E., SBORDONE L. and GALLAGHER A.J.

Abstract (from CDS):


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 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.
Methods. 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.
Results. 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.
Conclusions. 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.

Abstract Copyright: © M. Spite et al. 2019

Journal keyword(s): stars: abundances - binaries: spectroscopic - stars: Population II - stars: individual: 2MASS J18082002-5104378

VizieR on-line data: <Available at CDS (J/A+A/624/A44): oxy.dat>

Status in Simbad:  could be processed

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BD+44 493 Pe* 02 26 49.7388403813 +44 57 46.526253277   9.63 9.11     CEMP-no 81 0
2 SN 1997D SN* 04 11 01.00 -56 29 56.0       16.3   SN.IIPec 155 1
3 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 209 0
4 Wolf 1492 Pe* 13 40 02.4921790616 -00 02 18.750321114 11.601 11.832 11.451 11.184 10.892 sdF0: 257 0
5 Ross 841 PM* 14 02 30.0901582051 -05 39 05.181328144   11.508 11.149 10.866 10.576 sdA3 134 0
6 2MASS J18082002-5104378 SB* 18 08 20.0313699474 -51 04 37.884231813           ~ 9 0
7 CD-24 17504 Pe* 23 07 20.2536159873 -23 52 35.956455668   12.51 12.18     CEMP-no 82 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2019A&A...624A..44S and select 'bookmark this link' or equivalent in the popup menu


2019.12.11-17:44:17

© Université de Strasbourg/CNRS

    • Contact