Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..872a&link_type=abstract
Astronomy and Astrophysics, v.310, p.872-878
Astronomy and Astrophysics
Astrophysics
33
Diffusion, Stars: Abundances, Stars: Chemically Peculiar, Stars: Interiors, Stars: Mass-Loss
Scientific paper
The Fm-Am chemically peculiar stars are mainly characterised by a superficial under-abundance of calcium and scandium. The diffusion based model predicts such under-abundances, however, these anomalies are the result of a complex time-dependent stratification mechanism. Owing to the existence of accurate atomic data now available for highly ionised elements, we have carried out numerical simulations on calcium stratification in Fm-Am stars. Some computations for scandium are also presented. We have found that for some values of the thickness of the mixing zone, just below the superficial convection zone, and for a given range of the mass-loss rate, it exists a short phase of calcium overabundance followed by a phase of under-abundance (which may be identified with the usual Fm-Am phenomenon). Such a phase of calcium overabundance, if detected in young galactic clusters, will give interesting insight into the stellar structure, even for normal main sequence F and A stars.
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