Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...548..429p&link_type=abstract
The Astrophysical Journal, Volume 548, Issue 1, pp. 429-438.
Astronomy and Astrophysics
Astronomy
29
Stars: Abundances, Stars: Early-Type, Ultraviolet: Stars
Scientific paper
We have used archival International Ultraviolet Explorer high-dispersion SWP spectra to study the B III resonance line at 2065.8 Å in 44 early B stars. We find a median boron abundance about half that of solar system meteoritic material, consistent with the values found from previous studies of boron in early B stars. About one-third of the stars studied appear to have boron abundances that are a factor of 4 or more lower than this median. Many of these are stars with enhanced nitrogen abundances, confirming the belief that deep envelope mixing can occur in main-sequence B stars. A few stars with low boron abundances have normal N/C ratios. It is unclear whether all of these can be explained as stars where mixing depleted the boron but did not go deep enough to bring CN-processed material to the surface or if some stars were actually formed with an unusually low boron abundance.
Proffitt Charles R.
Quigley Mark F.
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