HST Be Abundances in the Alpha Centauri System

Details HST Be Abundances in the Alpha Centauri System HST Be Abundances in the Alpha Centauri System

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nupha.621...23p&link_type=abstract

Nuclear Physics A, v. 621, p. 23-26.

Physics

Nuclear Physics

Scientific paper

High signal-to-noise (200 to 1) Hubble Space Telescope GHRS spectra of α Cen A (spectral type G2 V) and α Cen B (spectral type K1 V) in the Be II λ3130 region have been analyzed, for the purpose of making a precise determination of light element destruction in stars of approximately the same mass of the Sun's. Light element abundances in this stellar system can be used as a fundamental test of models of the outer structure of solar-type stars. Li, Be, and B are destroyed in progressively deeper layers in the outer regions of stars; thus their surface abundances are the observable consequences of internal processes. A detailed spectrum synthesis gives [Be/(H)] = -0.04+/-0.12 dex for α Cen A and -0.54+/-0.24 dex for α Cen B using a model atmosphere with [M/(H)] = +0.10 dex.

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