Boron and Iron in Two B-dwarfs: A Test of Rotation in Massive Star Evolution

Details Boron and Iron in Two B-dwarfs: A Test of Rotation in Massive Star Evolution Boron and Iron in Two B-dwarfs: A Test of Rotation in Massive Star Evolution

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.4010b&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #40.10; Bulletin of the American Astronomical Society, Vol. 32, p.738

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We have used HST STIS spectra to determine boron and iron abundances in two well-studied B-stars. The boron abundances are used to search for evidence of rotational mixing while these stars are still on the main-sequence. New stellar evolution models (Heger et al. 2000) that include rotational mixing predict rapid depletion of boron from the surface before significant enrichments in nitrogen occur (both being affected by mixing with hotter gas from the H-burning layers). Examination of the new boron abundances, particularly with respect to nitrogen, suggest that rotation has affected the chemistry of one star, but not the other. In addition, we have calculated Fe-group abundances in these stars, which were previously unavailable, or highly uncertain, from optical spectroscopy.

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