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How many lambda Boo stars are binaries ?
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In the attempt to shed new light on the lambda Boo phenomenon we analyzed the astrometric, photometric and spectroscopic characteristics of stars out of a list of recently selected lambda Boo candidates. We show that the class is still ill-defined and discuss the possibility that some, if not most stars presently classified as lambda Boo, are in fact binary pairs and that peculiar abundances may not correspond to actual values if the average values of the atmospheric parameters Teff and log g are assumed and the effect of veiling is not taken into account.
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Spectroscopic and Photometric Investigation of Some Potentially Chemically Peculiar $\delta$ Scuti Stars
Detailed abundance analysis of ten Delta Scuti stars shows only three are chemically peculiar: AU Scl and FG Eri as Am stars, and HZ Vel as a lambda Bootis star.
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