The abundance of boron and beryllium in alpha Lyrae

Details The abundance of boron and beryllium in alpha Lyrae The abundance of boron and beryllium in alpha Lyrae

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194l.143b&link_type=abstract

Astrophysical Journal, vol. 194, Dec. 15, 1974, pt. 2, p. L143-L146.

Astronomy and Astrophysics

Astrophysics

24

Abundance, Atmospheric Composition, Beryllium, Boron, Satellite Observation, Stellar Atmospheres, Astronomical Models, Atmospheric Models, Cosmic Rays, Galactic Radiation, Heavy Elements, Light Scattering, Line Spectra, Lyra Constellation, Oao 3

Scientific paper

Copernicus satellite observations have been used to measure the equivalent width of the B II resonance line at 1362 A in alpha Lyr. Bonsack has determined the equivalent width for a Be II resonance line at 3130 A. Model atmosphere analyses of alpha Lyr result in LTE abundances of B/H = 1 to 2 times 10 to the -10th power and Be/H = 1 times 10 to the -11th power. The maximum possible LTE abundance of B, obtained by taking extreme values of all the atmospheric and atomic parameters, is B/H not greater than 7 times 10 to the -10th power, an extreme upper limit. An estimate of the non-LTE effects on these resonance lines indicates that Be is formed in LTE conditions and that the B/H ratio is 70 per cent or more of the LTE value.

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