CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): ALECIAN, G.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 290-295.
- Date: 04/1998
- Title: Time-dependent diffusion in A-stars
- Keyword(s): MICROSCOPIC DIFFUSION, CP STARS, STRATIFICATION PROCESSES
- Pages: 290 -- 295
Each time diffusion of elements is invoked in explaining abundance
anomalies in a star, this supposes implicitly that a stratification process
is in progress somewhere in that star. This means also, that the element
abundances can still be evolving according to the star's age and fundamental
parameters. Moreover, it has been shown that the superficial abundances may
have complex temporal behavior. This should be detectable through new
observations. In some cases, it may be already apparent in available data.
The building up of the elements' stratification is a very difficult process
to study. This is due to the existence of strong non-linearities in the
time-dependent equations, which must be solved numerically. We will discuss
some works that tackle this problem for Ap and Am stars, and we will present
some results concerning mostly Am stars. Future desirable improvements in
these studies will be considered.
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