A FEROS spectroscopic study of the extreme O supergiant He 3–759

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Volume 503 / No 3 (September I 2009)

A&A, 503 3 (2009) 985-990

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Table 4:

Physical and wind properties of He 3-759 with respect to HD 151804 and HD 152408, allowing for an uncertainty in absolute magnitude of $\pm$ 0.5 $^{\rm m}$ . Clumped mass-loss rates are quoted here for volume filling factors of f=0.1.
Star	He 3-759	HD 151804	HD 152408
	O8 Iaf	O8 Iaf	WN9ha
T_* (kK)	30.5	29.0	31.8
$R_{\ast}$ ( $R_{\odot}$ )	$\rm 32.1^{+8.3}_{-6.6}$	35.4	32.1
T_2/3 (kK)	29.3	28.1	31.3
$\log L/L_{\odot}$	5.90 $\pm$ 0.20	5.90	5.98
$v \sin i$ (km s^-1)	100	104	80
$v_{\infty}$ (km s^-1)	1000	1445	970
$\dot{M}$ ( $M_{\odot}$ yr^-1)	10 $^{-5.17\pm0.15}$	10^-5.20	10^-4.94
$X_{\rm H}$ (%)	49	43	27
$X_{\rm He}$ (%)	49	56	72
$X_{\rm N}$ (%)	0.3	0.25	0.6
$M_{K_{\rm s}}$ (mag)	-6.7 $\pm$ 0.5	-6.7	-6.6

Note. Formal uncertainties in T_* are $\pm$ 0.5 kK, while abundances
are reliable to within $\pm$ 5% (H and He) or a factor of two (N).

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