Bibcode
Israelian, G.
Referencia bibliográfica
The Journal of Astronomical Data, Vol. 8, 8E 2002
Fecha de publicación:
12
2002
Número de citas
2
Número de citas referidas
1
Descripción
The fragile and rare isotope 6Li has a spallative origin. It is rapidly
destroyed in solar-type stars while fully preserved in low-mass brown
dwarfs and planets. So far, 6Li has been unambigiously detected in only
few metal-poor halo and disk stars whereas it has never been observed
with a high level of confidence in any metal-rich or even solar
metallicity star (Andersen et al. 1984, Rebolo et al. 1986). This
observational fact is consistent with standard models of stellar
evolution (Forestini 1984) which predict that any initial atmospheric
6Li with which the metal-rich star was born is expected to disappear
within a few milion years. The extended convective envelopes of young
metal-rich stars are able to expose the circulating lithium to the
interior temperatures exceeding 2,000,000 K. On the other hand, some 7Li
may survive the mixing process since this stable isotope is destroyed at
much higher temperatures. Here we report a discovery of 6Li in the
atmosphere of the metal-rich solar-type star HD82943 which hosts a
planetary system. The presence of the 6Li isotope in the atmosphere of
HD82943 is interpreted as a direct evidence of a planet engulfed by a
parent star.