Boron in the Extreme Pop II Star HD 140283 and the Production of Light Elements in the Early Galaxy

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dc.creatorEdvardsson, B.
dc.creatorGustafsson, B.
dc.creatorJohansson, S. G.
dc.creatorKiselman, D.
dc.creatorLambert, D. L.
dc.creatorNissen, P. E.
dc.creatorGilmore, G.
dc.date1994-03-01
dc.date.accessioned2026-07-07T02:19:06Z
dc.date.available2026-07-07T02:19:06Z
dc.descriptionUsing observations of the 2496.7 A B I line with the HST GHRS at a nominal resolution of 90,000, we have found the abundance of boron of HD 140283 to be log epsilon_B (= 12 + log (N_B/N_H)) = 0.34 \pm 0.20. This result is found when a significant non-LTE effect in the formation of the B I line is taken into account. The resulting N_B/N_Be ratio is about 17 (in the range 9 -- 34), which is in very good agreement with what is expected from spallation by cosmic rays. We conclude that this origin of Be and B in the Early Galaxy is the most probable of recently suggested formation mechanisms. (Submitted to A&A. Postscript figures available via annymous ftp to "chiron.astro.uu.se" in directory pub/Preprints/P87)
dc.description6 pages, A&A plain TeX, UAO-94-P87
dc.identifierhttps://arxiv.org/abs/astro-ph/9403002
dc.identifierhttp://arxiv.org/abs/astro-ph/9403002
dc.identifierAstron. Astrophys. 290 (1994) 176
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9731
dc.subjectAstrophysics
dc.titleBoron in the Extreme Pop II Star HD 140283 and the Production of Light Elements in the Early Galaxy
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