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Table 12

Stellar and wind parameters for the WN5h star R136a3 – a member of the central ionizing cluster R136 in the Tarantula nebula (30 Doradus) located within the Large Magellanic Cloud (LMC).

Parameter Model CSH Model A

Teff (K) 53 000 52 000
R (R) 23.4 24.2
log L (L) 6.58 6.59
M (M) 135 135
XHa (%) 40 40
XC (%) 0.004 0.004
XN (%) 0.35 0.35
XO (%) 0.004 0.004
XFeb (%) ssa ssa
XNi (%) ssa ssa
v (km s-1) 2200 3300
(10-6   M/yr) 37.0 14.3

Notes. The parameters denoted by “CSH” have been taken from Crowther et al. (2010), whereas the parameters of model “A” show our consistently calculated dynamical values for almost the same set of stellar parameters. The result is a too low mass loss rate and a too high terminal velocity v of our model, indicating strongly that the mass M of the object, which has been assumed by Crowther et al. (2010) on basis of main-sequence evolutionary models (cf. Hirschi et al. 2004), is too high for the given radius (cf. Fig. 22 and Table 13). Scaled solar abundances with the usual scaling factor of 0.5 for the LMC have been adopted for all metals other than those given in the table. (Regarding the values of the solar abundances we refer to Asplund et al. 2009.)

(a)

The Xelement values represent the mass fractions of individual elements.

(b)

“ssa” is an abbreviation for “scaled solar abundances”.

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