| タイトル | The abundance of boron in three halo stars |
| 著者（英） | Lambert, David L.; Duncan, Douglas K.; Lemke, Michael |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1992-12-20 |
| 言語 | eng |
| 内容記述 | B abundances for three halo stars: HD 140283, HD 19445, and HD 201891 are presented. Using recent determinations of the Be abundance in HD 140283, B/Be of 10 +5/-4 is found for this star, and similar ratios are inferred for HD 19445 and HD 201891. This ratio is equal to the minimum value of 10 expected from a synthesis of B and Be by high-energy cosmic-ray spallation reactions in the interstellar medium. It is shown that the accompanying synthesis of Li by alpha on alpha fusion reactions is probably a minor contributor to the observed 'primordial' Li of halo stars. The observed constant ratios of B/O and Be/O are expected if the principal channel of synthesis involves cosmic-ray CNO nuclei from the supernovae colliding with interstellar protons. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A21490 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/321088 |
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