C, N, O in Boo stars and in composite spectra
Dipartimento di Astronomia, Università degli Studi di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy e-mail: email@example.com
2 Istituto Nazionale per l'Astrofisica – Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy
Accepted: 14 March 2005
The selective abundance of C, N, O (almost solar) with respect to that of other elements (underabundant) in λ 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 λ Boo stars.
Key words: stars: atmospheres / stars: chemically peculiar / stars: binaries: spectroscopic
© ESO, 2005