Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..130p&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 130-139.
Astronomy and Astrophysics
Astronomy
24
A Stars, Abundance, Boron, Line Spectra, Stellar Models, Stellar Spectrophotometry, Cosmic Rays, Cosmology, Nuclear Fusion, Spaceborne Astronomy
Scientific paper
High-resolution (0.05 A) Copernicus observations of the 1362.46-A B II resonance line in Sirius and Vega are analyzed. In Vega, this line is found to be strong, broad, asymmetric, and blended with another line; it is not observed in Sirius. Angular velocities of 18-20 km/s for Vega and 10 km/s for Sirius are determined. A search for subordinate lines of B II reveals no such features in the Sirius spectrum and the possible weak presence of two unblended lines in that of Vega. The cause of the asymmetry of the B II blend in Vega is investigated, line-profile calculations are performed for Sirius, and the B content of Vega is obtained by means of an LTE synthesis of the B II blend as well as a non-LTE computation of the B II line alone. It is concluded that Sirius is deficient in B relative to Vega by a factor of at least 20. The Be abundances of both stars are also examined in relation to the galactic-cosmic-ray spallation theory for the origin of light elements.
Boesgaard Ann Merchant
Milliard Bruno
Pitois M. L.
Praderie Francoise
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