The selective abundance of C, N, O (almost solar) with respect to that of other elements (underabundant) in lambda Boo stars has been interpreted as a characteristic peculiarity of these objects, when considered as single stars. We show here that a similar selective abundance is predicted from the composite spectra resulting from two unresolved stars in the same temperature range as the lambda Boo stars.
@article{arxiv.astro-ph/0504102,
title = {C,N,O in lambda Boo stars and in composite spectra},
author = {R. Faraggiana and P. Bonifacio},
journal= {arXiv preprint arXiv:astro-ph/0504102},
year = {2009}
}