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Electrical conductivity of plasmas of DB white dwarf atmospheres

“…One of the most frequently used approximations for consideration of transport properties of different plasmas is the approximation of ‘fully ionized plasma’ (Spitzer 1962; Radke et al 1976; Adamyan et al 1980; Kurilenkov 1984; Ropke & Redmer 1989; Djuric et al 1991; Nurekenov et al 1997; Zaika, Mulenko & Khomkin 2000; Esser, Redmer & Ropke 2003). It was shown that the electrical conductivity of fully ionized plasmas can be successfully calculated using the modified random‐phase approximation (RPA) (Djuric et al 1991; Adamyan et al 1994a,b) in the region of strong and moderate non‐ideality, while the weakly non‐ideal plasmas were successfully treated within the semiclassical approximation (SC) (Mihajlov et al 1993; Vitel et al 2001).…”

“…It was shown that the electrical conductivity of fully ionized plasmas can be successfully calculated using the modified random‐phase approximation (RPA) (Djuric et al 1991; Adamyan et al 1994a,b) in the region of strong and moderate non‐ideality, while the weakly non‐ideal plasmas were successfully treated within the semiclassical approximation (SC) (Mihajlov et al 1993; Vitel et al 2001). In practice, even the plasmas with a significant neutral component are treated as fully ionized in order to simplify the considered problems (Ropke & Redmer 1989; Esser & Ropke 1998; Zaika et al 2000; Esser et al 2003). However, our preliminary estimates have shown that such an approach is not applicable for the helium plasmas of DB white dwarf atmospheres described in Koester (1980), where the influence of the neutral component cannot be neglected.…”