Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959apj...130..843b&link_type=abstract
Astrophysical Journal, vol. 130, p.843
Astronomy and Astrophysics
Astrophysics
61
Scientific paper
The abundance of lithium relative to vanadium, or its upper limit, has been determined for forty-six normal stars of spectral types from G8 to MO, inclusive. These results are based upon high-dispersion spectrograms obtained with the coude spectrograph of the 100-inch telescope. The abundance ratio for the sun has also been determined, using an equivalent width for lithium measured by Greenstein and Richardson and measurements of vanadium lines in the Utrecht Atlas. In addition, temperatures, electron pressures, and turbulent velocities in the stellar atmospheres have been derived. A range of up to a factor of 100 in the abundance ratio is found among stars of similar surface characteristics. The maximum abundance ratio observed among similar stars declines with surface temperature. It is not likely that a significant part of these variations is due to changes in the vanadium abundance. Greenstein and Richardson have proposed that the lirnium in the solar surface has been depleted by convective mixing to hotter regions. The possibility that this hypothesis may explain both the trend and the variations in the cooler stars is suggested and discussed.
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