Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..191o&link_type=abstract
Astronomy and Astrophysics, Vol.109, P. 191, 1982
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
It was recently shown that due to the plasmon-electron interaction the radiation transfer at the center of the Sun (when free-free processes dominate the opacity) increases by a factor Q (55 Hd/H) > 2 (Opher, 1981), where Hd(H) is the corrected (uncorrected) radiation transfer. We analyse here the case when electron scattering dominates the opacity. It is found that the temperature and density dependence of Q1 (due to the plasmon-electron interaction) can be expressed in terms of the single parameter u ≡ hωpe/kBT∝n1/2/T, where hωpe is the plasmon energy. T is the temperature, n is the electron density, and kB is Boltzmann's constant. This can be compared with the temperature and density dependence of Q2 (due to Debye correlations) for a given chemical composition, which is dependent on the parameter α≡n1/3/T. The parameter Q1(Q2) increases with increasing up(α). We have, in general, the relation Q = Q1Q2 and large values of Q are predicted for stars of mass M > Msun. As an example it is found that in a 3 M0 star at the beginning of the triple-cc process, the value of Q is approximately equal to 1.5 (i. e. the effective electron scattering opacity is approximately equal to 2/3 of its normal value).
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