The pulsational characteristics of the Bootis type star BD Phe (HD 11413)

Abstract

We have investigated the pulsational characteristics of the λ Bootis type star BD Phe. Detailed asteroseismological investigations have so far only been carried out for four members of this group of stars, with the number of identified frequencies in these stars ranging from four to seven. We present 30 h of UBVRI time-series photometry, together with 14 h of high-dispersion high signal-to-noise ratio spectroscopy of BD Phe. At least seven frequencies were detected. Since these are all present in independent sets of observations, we argue that the frequencies are fairly well determined despite our limited data. We present a very tentative discussion of the possible pulsation modes. Our results may be useful in the context of recently published δ Scuti pulsation models, which take into account the effects of diffusion.