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| Paper: |
Element Stratification in Main Sequence Stars and its Effect on Stellar Oscillations |
| Volume: |
310, Variable Stars in the Local Group (IAU Colloquium 193) |
| Page: |
413 |
| Authors: |
Vauclair, S. |
| Abstract: |
Element settling due to the combined effects of gravity, thermal gradient, radiative acceleration and concentration gradient may lead to important abundance variations inside the stars that cannot be neglected in the computation of stellar structure. These processes were first introduced to account for abundance anomalies in “peculiar stars”, but their importance in the so-called “normal” stars is now fully acknowledged, specially after the evidence of helium steeling in the Sun from helioseismology. These microscopic processes work in competition with macroscopic motions, such as rotation-induced mixing or mass loss, which increase the settling timescales. We have recently obtained clear evidence that asteroseismology of main sequence solar-type stars can give signatures of the chemical variations inside the stars and provide a better understanding of these processes. |
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