Observed spectrum of 2MASS J1808-5104 in the region of the Be doublet and synthetic spectra computed with A(Be) = − 3.0, − 2.0 and − 1.6 (blue lines), and − 2.33 (red line, best fit). Taking into account the uncertainty in the position of the continuum, we adopted A (Be) ≤−2.0 dex i.e. log (Be/H) ≤−14.0.
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