Physics – Atomic Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.3404d&link_type=abstract
American Astronomical Society Meeting 205, #34.04; Bulletin of the American Astronomical Society, Vol. 36, p.1402
Physics
Atomic Physics
Scientific paper
Microscopic diffusion processes (such as radiative levitation and gravitational settling/thermal diffusion) in the outer layers of stars are important because they may give rise to surface abundance anomalies. While many previous works on radiative acceleration used atomic data from the Opacity Project (OP) and from OPAL, most of stellar evolutionary codes including radiative levitation to date have used atomic data from the OPAL group. We previously reported differences in radiative accelerations (grad) derived from prior OP data with those computed from OPAL. I will present a comparison using the Updated opacities from OP with the previous version of OP data as well as with OPAL results.In light of the significant differences in the inferred acceleration rates, theoretical errors should be taken into account when comparing models with observations. The implications for stellar evolution will be discussed. The sensitivity of grad to the atomic physics may provide a useful test of different opacity sources. Partial support is provided by the CNRS (Observatoire de Meudon).
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