Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.3115v&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #31.15; Bulletin of the American Astronomical Society, Vol. 26, p.910
Astronomy and Astrophysics
Astronomy
Scientific paper
Boron is a trace element in hot stars which can be observed from the B II resonance line at 1362 Angstroms. We have used IUE archival spectra to examine the B abundances in early type stars. The abundances of boron in A and B-type stars were originally calculated by Boesgaard & Heacox (1978 ApJ 226, 888) from Copernicus spectra as a method of testing the predictions of galactic cosmic ray spallation reactions. We are primarily interested in the effects of stellar evolution on B. Boesgaard & Heacox do not report any relationship between evolutionary state and the B abundance, however there are very few evolved stars in their sample and the few studied have very large uncertainties in B. Boron is destroyed by protons at temperatures above about 4 million K, thus the stellar surface B abundance is a sensitive monitor of evolutionary processes, such as mass loss and mixing, which would lead to large losses in the surface B. Gies & Lambert (1992 ApJ 387, 673) found evidence of CNO-cycled gas in some slightly evolved B-type stars, suggesting that some mixing may occur in massive stars near the main-sequence. We examine the B abundances in these stars for evidence of a boron-nitrogen relationship.
Lambert David L.
Lemke Michael
Venn Kim A.
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