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Be vs. Li Abundance in Li-Rich Giants: an Evidence of Li Production in Red Giants

Published online by Cambridge University Press:  25 May 2016

B. V. Castilho
B. V. Castilho*
Affiliation:
Departamento de Astronomia, Instituto Astronômico e Geofísico, Universidade de São Paulo, CP 3386, 01060-970, Brazil

Abstract

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We present Be abundances derived through spectral synthesis for two Li-rich giants and a Li-normal giant, plus α Cen A and B, based on observations of the Be II λ 3130.420 and 3131.066 Å lines obtained with the CASPEC spectrograph at the ESO 3.6m telescope.

The values derived for the two Li-rich giants (HD146850, HD787) agree with the one for the Li-normal giant (HD220321), and shows that Be was depleted in these stars (by > 90% i.e. by a factor of 10 or larger from the initial Pop I value (logN(Be)= 1.4)).

This result implies that the original Li in these stars was almost completely destroyed, and that Li is most probably produced in red giants.

Type
4. Lithium Abundances
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 331 - 337
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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