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Boron in the Extreme Pop II Star HD 140283 and the Production of Light Elements in the Early Galaxy | | B. Edvardsson
; B. Gustafsson
; S.G. Johansson
; D. Kiselman
; D.L. Lambert
; P.E. Nissen
; G. Gilmore
; | | Date: |
1 Mar 1994 | | Journal: | Astron. Astrophys. 290 (1994) 176 | | Subject: | astro-ph | | Abstract: | Using 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) | | Source: | arXiv, astro-ph/9403002 | | Services: | Forum | Review | PDF | Favorites | |
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