Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163..145m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 145-150.
Physics
16
Diffusion Theory, Hot Stars, Silicon, Stellar Atmospheres, Stellar Composition, White Dwarf Stars, Abundance, Acceleration (Physics), Equilibrium Equations, Line Spectra
Scientific paper
Preliminary computations of radiative acceleration and equilibrium abundances for Si in the two DA white dwarfs Wolf 1346 and Feige 24 are presented. It is shown that at the temperature of Feige 24, the radiative acceleration on silicon is large enough to support two different silicon clouds, separated by a depletion zone, with silicon supported with an equilibrium abundance as large as 0.05 times the solar abundance, in agreement with observations. For the cooler DA Wolf 1346, the prediction of no equilibrium for C, N, and O is consistent with observations, while the prediction of one equilibrium silicon cloud with a maximum abundance as large as 0.1 the solar abundance is much larger than that derived from observations. It is noted that diffusion theory predicts equilibrium abundances which vary with depth in the atmosphere, while abundances derived from observations assume homogeneous composition.
Morvan Erwan
Vauclair Gerard
Vauclair Sylvie
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