A combined HST and XMM-Newton campaign for the magnetic O9.7 V star HD 54879 - Constraining the weak-wind problem of massive stars

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Table 1

Derived physical parameters for HD 54879.

T_∗	log L	log g	R_∗	M_∗	vsini	ξ_ph	v_mac	log Ṁ_{B = 0} ^b	log Ṁ	E _B−V
[K]	[L_⊙]	[cm s^-1]	[R_⊙]	[M_⊙]	[km s^-1]	[km s^-1]	[km s^-1]	[M_⊙ yr^-1]	[M_⊙ yr^-1]	[mag]

30.5 ± 0.5	4.45 ± 0.2 ^a	4.0 ± 0.1	6.1 ± 1.5 ^a	14 ± 7 ^a	<4	<4	<4	≈ −9.0	≲–10.2	0.35 ± 0.01

Notes. Stellar parameters derived from our spectral analysis.

^(a)

The errors are dominated by the assumed uncertainty in the distance (≈20%, see Sect. 1).

^(b)

The mass-loss rate that the star would have in the absence of a magnetic field should not be confused with the true mass-loss rate.

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