J/A+A/582/A74 WISE J072543.88-235119.7 line abundances (Spite+, 2015)
Lithium abundance in a turnoff halo star on an extreme orbit.
Spite M., Spite F., Caffau E., Bonifacio P.
<Astron. Astrophys. 582, A74 (2015)>
=2015A&A...582A..74S 2015A&A...582A..74S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, population II ; Abundances
Keywords: stars: abundances - stars: population II - Galaxy: evolution -
cosmology: observations
Abstract:
The lithium abundance in turnoff stars of the old population of our
Galaxy is remarkably constant in the metallicity interval
-2.8<[Fe/H]←2.0, defining a plateau. The Li abundance of these
turnoff stars is clearly lower than the abundance predicted by the
primordial nucleosynthesis in the frame of the standard Big Bang
nucleosynthesis. Different scenarios have been proposed for explaining
this discrepancy, along with the very low scatter of the lithium
abundance around the plateau.
The recently identified very high velocity star, WISE.J0725.2351
appears to belong to the old Galactic population, and appears to be an
extreme halo star on a bound, retrograde Galactic orbit. In this
paper, we study the abundance ratios and, in particular the lithium
abundance, in this star.
The available spectra (ESO-Very Large Telescope) are analyzed and the
abundances of Li, C, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Fe, Co, Ni,
Sr and Ba are determined.
Description:
Main parameters of the lines and logarithm of the corresponding
abundances for logA(H)=12.
Objects:
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RA (2000) DE Designation(s)
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07 25 43.92 -23 51 16.8 WISE J072543.88-235119.7 = UCAC3 133-60515
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 39 121 Line list and abundances (LTE computations)
for WISE J072543.88-235119.7
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Species Species identifier
9- 16 F8.4 nm lambda Wavelength
20- 24 F5.3 eV Exc Excitation potential of the lower level
27- 32 F6.3 [-] loggf Oscillator strength
35- 39 F5.2 [-] logAbd Log abundance in WISE J072543.88-235119.7
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Acknowledgements:
Monique Spite, monique.spite(at)obspm.fr
(End) Patricia Vannier [CDS] 25-Sep-2015