SIMBAD references

1994A&A...290..176E - Astronomy and Astrophysics, volume 290176-182 (1994/10-1)

Boron in the extreme Population II star HD 140283 and the production of light elements in the Early Galaxy.

EDVARDSSON B., GUSTAFSSON B., JOHANSSON S.G., KISELMAN D., LAMBERT D.L., NISSEN P.E. and GILMORE G.

Abstract (from CDS):

Using observations of the 2496.7A Bi line with the HST GHRS at a nominal resolving power of 90,000, we have found the abundance of boron of HD140283 to be logεB(=12+log(NB/NH))=0.34±0.20. This result is found when a significant non-LTE effect in the formation of the Bi line is taken into account. The resulting NB/NBe 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.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: abundances - stars: abundances - line: formation - stars: individual: HD140283

Simbad objects: 3

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