Bibcode
Beckman, J.; Rebolo, R.; Molaro, P.
Referencia bibliográfica
IN: Advances in nuclear astrophysics; Proceedings of the Second IAP Workshop, Paris, France, July 7-11, 1986 (A87-53676 24-90). Gif-sur-Yvette, France, Editions Frontieres, 1986, p. 29-45.
Fecha de publicación:
0
1986
Número de citas
6
Número de citas referidas
3
Descripción
The CCD camera and Intermediate Dispersion Spectrograph of the 2.5 m
Issaac Newton Telescope are used to obtain high quality spectra of the
6708-A Li-7 resonance doublet in 22 dwarfs with metallicities not
greater than -0.7. A mean constant value of Log N(Li) = 2.07 (+ or -
0.1) is found for highly metal deficient dwarfs (Fe/H abundance ratios
of not greater than 1.5) with atmospheric temperatures T(eff) greater
than 5500 K, and a larger spread with values of Log N(Li) up to 2.4 for
the warmer dwarfs with metallicities between -0.7 and -1.2. The results
agree with previous findings by Spite et al. (1982, 1984) showing a
highly uniform Li abundance near the inception of the galaxy. Li
depletion appears to set in at higher temperatures for the moderately
metal deficient stars than for the extremely metal deficient, consistent
with metallicity-dependent depletion rates (low metals, low depletion).